{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": false,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": false,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": false,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": false,
    "zipPaymentFlag": "u",
    "hassleFreeReturn": false,
    "lifetimeReplacement": false,
    "cpn_off": false
}
1997 Ford Explorer
1
0
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Price Match Guarantee
60-Day Returns
Lifetime Replacement
1997 Ford Explorer

1997 Ford Explorer Alternators

Refine by:

Shop Catalog

Showing 1 - 15 of 40 results
Display item:
15
30
45
Sort by:
Alternator, 6 Cyl., 4.0L Engine, OHV, Standard, with 95 Amp Alternator -
Quality-Built®
Alternator, 6 Cyl., 4.0L Engine, OHV, Standard, with 95 Amp Alternator -
Part Number: MPA15639N
Guaranteed to Fit
$176.49
Vehicle Fitment
  • 1997 Ford Explorer XL 6 Cyl 4.0L OHV, Standard, With 95 Amp Alternator
  • 1997 Ford Explorer Sport 6 Cyl 4.0L OHV, Standard, With 95 Amp Alternator
  • 1997 Ford Explorer XLT 6 Cyl 4.0L OHV, Standard, With 95 Amp Alternator
Product Details
Condition : NewAmperage Output : 95 AmpPulley Type : SerpentineNumberof Grooves : 6 GroovesQuantity Sold : Sold individuallyWarranty : Lifetime Quality-Built limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Regulator Style : Internally RegulatedReplaces OE Number : 7750, 1F20-18-300, ZZL0-18-301Recommended Use : OE ReplacementRotation : Clockwise rotationIncludes : With complimentary 24/7 Quality-Built (QB) Roadside Assistance Program (RAP)Series : QB SupremeInterchange Part Number : REPF330112, 15639, AL7526N, 7750, 1F20-18-300, ZZL0-18-301
Alternator, 6 Cyl., 4.0L Engine, OHV, Optional, with 130 Amp Alternator -
Quality-Built®
Alternator, 6 Cyl., 4.0L Engine, OHV, Optional, with 130 Amp Alternator -
Part Number: MPA7768602
Guaranteed to Fit
$91.49

+ $76.86 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer XL 6 Cyl 4.0L OHV, Optional, With 130 Amp Alternator
  • 1997 Ford Explorer Sport 6 Cyl 4.0L OHV, Optional, With 130 Amp Alternator
  • 1997 Ford Explorer XLT 6 Cyl 4.0L OHV, Optional, With 130 Amp Alternator
Product Details
Condition : RemanufacturedAmperage Output : 130 AmpPulley Type : SerpentineNumberof Grooves : 6 GroovesQuantity Sold : Sold individuallyWarranty : Lifetime Quality-Built limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Replaces OE Number : 7768, ZZM2-18-300, XL3U-CB, XLRecommended Use : OE ReplacementRotation : Clockwise rotationIncludes : With complimentary 24/7 Quality-Built (QB) Roadside Assistance Program (RAP)Series : QB PremiumInterchange Part Number : REPF330109, 7768602N, 7768, ZZM2-18-300, XL3U-CB, XL
Alternator, 6 Cyl., 4.0L Engine, with 142 Mm. (5 5/8 In. Dia.) Alternator Case and 130 Amp. Alternator -
AC Delco®
Alternator, 6 Cyl., 4.0L Engine, with 142 Mm. (5 5/8 In. Dia.) Alternator Case and 130 Amp. Alternator -
Part Number: AC3351106
Guaranteed to Fit
$150.49
Vehicle Fitment
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L With 142 mm. (5 5/8 in. dia.) Alternator Case And 130 Amp. Alternator
  • 1997 Ford Explorer XL 6 Cyl 4.0L With 142 mm. (5 5/8 in. dia.) Alternator Case And 130 Amp. Alternator
  • 1997 Ford Explorer Sport 6 Cyl 4.0L With 142 mm. (5 5/8 in. dia.) Alternator Case And 130 Amp. Alternator
  • 1997 Ford Explorer Limited 6 Cyl 4.0L With 142 mm. (5 5/8 in. dia.) Alternator Case And 130 Amp. Alternator
  • 1997 Ford Explorer XLT 6 Cyl 4.0L With 142 mm. (5 5/8 in. dia.) Alternator Case And 130 Amp. Alternator
Product Details
Notes : With 142 mm (5-5/8 in.) diameter alternator case; With 3 bolt mountingCondition : NewAmperage Output : 130 AmpQuantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Professional SeriesReplaces OE Number : Repl. OE No. ZZM2-18-300B, F6UU-FARecommended Use : OE Replacement
Alternator, 6 Cyl., 4.0L Engine, with 130 Amp. Alternator -
AC Delco®
Alternator, 6 Cyl., 4.0L Engine, with 130 Amp. Alternator -
Part Number: AC3342253A
Guaranteed to Fit
$127.49

+ $46.36 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L With 130 Amp. Alternator
  • 1997 Ford Explorer XL 6 Cyl 4.0L With 130 Amp. Alternator
  • 1997 Ford Explorer Sport 6 Cyl 4.0L With 130 Amp. Alternator
  • 1997 Ford Explorer Limited 6 Cyl 4.0L With 130 Amp. Alternator
  • 1997 Ford Explorer XLT 6 Cyl 4.0L With 130 Amp. Alternator
Product Details
Condition : RemanufacturedAmperage Output : 130 AmpQuantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Professional SeriesInterchange Part Number : REPF330109, 7768602NRecommended Use : OE Replacement
Alternator, 8/6 Cyl., 5.0/4.0L Engine, SOHC -
Quality-Built®
Alternator, 8/6 Cyl., 5.0/4.0L Engine, SOHC -
Part Number: MPA7787604
Guaranteed to Fit
$95.49

+ $87.84 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L SOHC
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L SOHC
  • 1997 Ford Explorer XL 6 Cyl 4.0L SOHC
  • 1997 Ford Explorer Limited 8 Cyl 5.0L
  • 1997 Ford Explorer XLT 6 Cyl 4.0L SOHC
  • 1997 Ford Explorer Eddie Bauer 8 Cyl 5.0L
  • 1997 Ford Explorer Limited 6 Cyl 4.0L SOHC
  • 1997 Ford Explorer XLT 8 Cyl 5.0L
Product Details
Condition : RemanufacturedAmperage Output : 130 AmpPulley Type : SerpentineNumberof Grooves : 6 GroovesQuantity Sold : Sold individuallyWarranty : Lifetime Quality-Built limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Replaces OE Number : 7787, XL2U-AA, F77U-AC, F77U-ARecommended Use : OE ReplacementRotation : Clockwise rotationIncludes : With complimentary 24/7 Quality-Built (QB) Roadside Assistance Program (RAP)Series : QB PremiumInterchange Part Number : REPF330155, 15639, 7787, XL2U-AA, F77U-AC, F77U-A
Alternator, 6 Cyl., 4.0L Engine, OHV, Std, 95 Amps -
Remy®
Alternator, 6 Cyl., 4.0L Engine, OHV, Std, 95 Amps -
Part Number: RMY923232
Guaranteed to Fit
$275.99
Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L OHV, Std; 95 Amps
  • 1997 Ford Explorer XL 6 Cyl 4.0L OHV, Std; 95 Amps
  • 1997 Ford Explorer XLT 6 Cyl 4.0L OHV, Std; 95 Amps
Product Details
Notes : 12 Voltage; Internal Voltage Regulator Type; Internal Fan TypeCondition : NewAmperage Output : 95 AmpQuantity Sold : Sold individuallyWarranty : 2-year Remy limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Includes : PulleyRecommended Use : OE ReplacementRotation : Clockwise rotation
Alternator, 6 Cyl., 4.0L Engine, 95 A -
Bosch®
Alternator, 6 Cyl., 4.0L Engine, 95 A -
Part Number: BSAL598N
Guaranteed to Fit
$193.99
Vehicle Fitment
  • 1997 Ford Explorer XL 6 Cyl 4.0L 95 A
  • 1997 Ford Explorer Sport 6 Cyl 4.0L 95 A
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L 95 A
  • 1997 Ford Explorer Limited 6 Cyl 4.0L 95 A
  • 1997 Ford Explorer XLT 6 Cyl 4.0L 95 A
Product Details
Notes : 330 Plug Type; 2 o'clock regulator plug clockCondition : NewAmperage Output : 95 AmpNumberof Grooves : 6 GroovesQuantity Sold : Sold individuallyWarranty : Lifetime Bosch limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : European Vehicle PartsRecommended Use : OE ReplacementRotation : Clockwise rotationSeries : OE Replacement SeriesInterchange Part Number : REPF330127, 15553, AL513X
Alternator, 8/6 Cyl., 5.0/4.0L Engine, 130 Amp (Originally Equipped) Eng. VIN: E -
WAI®
Alternator, 8/6 Cyl., 5.0/4.0L Engine, 130 Amp (Originally Equipped) Eng. VIN: E -
Part Number: WAI7787N-6G2
Guaranteed to Fit
$98.99
Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L Eng. VIN: E, 130 Amp (Originally Equipped)
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L Eng. VIN: E, 130 Amp (Originally Equipped)
  • 1997 Ford Explorer XL 6 Cyl 4.0L Eng. VIN: E, 130 Amp (Originally Equipped)
  • 1997 Ford Explorer Limited 8 Cyl 5.0L 130 Amp (Originally Equipped)
  • 1997 Ford Explorer XLT 6 Cyl 4.0L Eng. VIN: E, 130 Amp (Originally Equipped)
  • 1997 Ford Explorer Eddie Bauer 8 Cyl 5.0L 130 Amp (Originally Equipped)
  • 1997 Ford Explorer Limited 6 Cyl 4.0L Eng. VIN: E, 130 Amp (Originally Equipped)
  • 1997 Ford Explorer XLT 8 Cyl 5.0L 130 Amp (Originally Equipped)
Product Details
Condition : NewQuantity Sold : Sold individuallyWarranty : WAI limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Recommended Use : OE Replacement
Alternator, 6 Cyl., 4.0L Engine, with 95 Amp. Alternator -
AC Delco®
Alternator, 6 Cyl., 4.0L Engine, with 95 Amp. Alternator -
Part Number: AC3342620A
Guaranteed to Fit
$118.49

+ $31.72 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer XL 6 Cyl 4.0L With 95 Amp. Alternator
  • 1997 Ford Explorer Sport 6 Cyl 4.0L With 95 Amp. Alternator
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L With 95 Amp. Alternator
  • 1997 Ford Explorer Limited 6 Cyl 4.0L With 95 Amp. Alternator
  • 1997 Ford Explorer XLT 6 Cyl 4.0L With 95 Amp. Alternator
Product Details
Condition : RemanufacturedAmperage Output : 95 AmpQuantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Professional SeriesInterchange Part Number : REPF330150, 15639, AL7526NRecommended Use : OE Replacement
Alternator, 8/6 Cyl., 5.0/4.0L Engine, To 130 Amp Alternator -
Bosch®
Alternator, 8/6 Cyl., 5.0/4.0L Engine, To 130 Amp Alternator -
Part Number: BSAL7543X
Guaranteed to Fit
$146.99

+ $42.70 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L
  • 1997 Ford Explorer XL 6 Cyl 4.0L
  • 1997 Ford Explorer Limited 8 Cyl 5.0L To 130 Amp Alternator
  • 1997 Ford Explorer XLT 6 Cyl 4.0L
  • 1997 Ford Explorer Eddie Bauer 8 Cyl 5.0L To 130 Amp Alternator
  • 1997 Ford Explorer Limited 6 Cyl 4.0L
  • 1997 Ford Explorer XLT 8 Cyl 5.0L To 130 Amp Alternator
Product Details
Condition : RemanufacturedQuantity Sold : Sold individuallyWarranty : 24-month or unlimited-mileage Bosch limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : European Vehicle PartsSeries : OE Replacement Series
Alternator, 8/6 Cyl., 5.0/4.0L Engine -
AC Delco®
Alternator, 8/6 Cyl., 5.0/4.0L Engine -
Part Number: AC3342270A
Guaranteed to Fit
$150.99

+ $36.60 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L
  • 1997 Ford Explorer XL 6 Cyl 4.0L
  • 1997 Ford Explorer Limited 8 Cyl 5.0L
  • 1997 Ford Explorer XLT 6 Cyl 4.0L
  • 1997 Ford Explorer Eddie Bauer 8 Cyl 5.0L
  • 1997 Ford Explorer Limited 6 Cyl 4.0L
  • 1997 Ford Explorer XLT 8 Cyl 5.0L
Product Details
Condition : RemanufacturedAmperage Output : 130 AmpQuantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Professional SeriesInterchange Part Number : REPF330109, 7768602NRecommended Use : OE ReplacementProduct Fit : Direct Fit
Alternator, 6 Cyl., 4.0L Engine, OHV, Opt (Originally Equipped), 130 Amps -
Remy®
Alternator, 6 Cyl., 4.0L Engine, OHV, Opt (Originally Equipped), 130 Amps -
Part Number: RMY92306
Guaranteed to Fit
$155.49
Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L OHV, Opt (Originally Equipped); 130 Amps
  • 1997 Ford Explorer XL 6 Cyl 4.0L OHV, Opt (Originally Equipped); 130 Amps
  • 1997 Ford Explorer XLT 6 Cyl 4.0L OHV, Opt (Originally Equipped); 130 Amps
Product Details
Notes : 12 Voltage; Internal Voltage Regulator Type; Internal Fan TypeCondition : NewAmperage Output : 130 AmpQuantity Sold : Sold individuallyWarranty : 2-year Remy limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Includes : PulleyRecommended Use : OE ReplacementRotation : Clockwise rotation
Alternator, 6 Cyl., 4.0L Engine, SOHC, 130 Amp -
Denso®
Alternator, 6 Cyl., 4.0L Engine, SOHC, 130 Amp -
Part Number: NP2105320
Guaranteed to Fit
$161.99

+ $41.48 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L SOHC, 130 Amp
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L SOHC, 130 Amp
  • 1997 Ford Explorer XLT 6 Cyl 4.0L SOHC, 130 Amp
  • 1997 Ford Explorer XL 6 Cyl 4.0L SOHC, 130 Amp
  • 1997 Ford Explorer Limited 6 Cyl 4.0L SOHC, 130 Amp
Product Details
Condition : RemanufacturedAmperage Output : 130 AmpQuantity Sold : Sold individuallyWarranty : 1-year Denso limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Recommended Use : OE Replacement
Alternator, 6 Cyl., 4.0L Engine, Eng.VIN: X, 130 Amp, with Door Keypad -
Denso®
Alternator, 6 Cyl., 4.0L Engine, Eng.VIN: X, 130 Amp, with Door Keypad -
Part Number: NP2105224
Guaranteed to Fit
$161.49

+ $41.48 Refundable Core Charge

Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L Eng.VIN: X, 130 Amp; With Door Keypad
  • 1997 Ford Explorer XL 6 Cyl 4.0L Eng.VIN: X, 130 Amp; With Door Keypad
  • 1997 Ford Explorer XLT 6 Cyl 4.0L Eng.VIN: X, 130 Amp; With Door Keypad
Product Details
Condition : RemanufacturedAmperage Output : 130 AmpPulley Type : SerpentineNumberof Grooves : 6 GroovesQuantity Sold : Sold individuallyWarranty : 1-year Denso limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Includes : With PulleyInterchange Part Number : REPF330109, 7768602NRecommended Use : OE ReplacementRotation : Clockwise rotation
Alternator, 8/6 Cyl., 5.0/4.0L Engine -
AC Delco®
Alternator, 8/6 Cyl., 5.0/4.0L Engine -
Part Number: AC3351125
Guaranteed to Fit
$165.99
Vehicle Fitment
  • 1997 Ford Explorer Sport 6 Cyl 4.0L SOHC Engine
  • 1997 Ford Explorer Eddie Bauer 6 Cyl 4.0L SOHC Engine
  • 1997 Ford Explorer XL 6 Cyl 4.0L SOHC Engine
  • 1997 Ford Explorer Limited 8 Cyl 5.0L
  • 1997 Ford Explorer XLT 6 Cyl 4.0L SOHC Engine
  • 1997 Ford Explorer Eddie Bauer 8 Cyl 5.0L
  • 1997 Ford Explorer Limited 6 Cyl 4.0L SOHC Engine
  • 1997 Ford Explorer XLT 8 Cyl 5.0L
Product Details
Notes : Refer to repair manual proceduresCondition : NewAmperage Output : 130 AmpQuantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Professional SeriesRecommended Use : OE ReplacementProduct Fit : Direct Fit
Page 1 of 3 | Showing 1 - 15 of 40 results

Top Rated Products

Quality-Built Alternator, 8/6 Cyl., 5.0/4.0L Engine, SOHC -
$95.49( Review)
Thanks so much for the quick shipping. I got it the next day after ordering & shippedSee More
Kathy E.
VERIFIED PURCHASER
Quality-Built Alternator, 6 Cyl., 4.0L Engine, OHV, Standard, with 95 Amp Alternator -
$176.49( Review)
This item fit perfectly. I ordered on a a Tuesday afternoon and received a day later.See More
Brian H.
VERIFIED PURCHASER

Popular Products

Helpful Automotive Resources

Where is the Voltage Regulator Located on an Alternator?
Where is the Voltage Regulator Located on an Alternator?To access the voltage regulator, all you need to do is park your vehicle, disconnect the car battery, and check the engine compartment. It’s helpful to look up the voltage regulator for your vehicle on CarParts.com so you can determine what it looks like. .kadence-column_d10526-07 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_d10526-07 > .kt-inside-inner-col,.kadence-column_d10526-07 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_d10526-07
How to Replace Alternator: 2009-2018 Dodge RAM 1500
How to Replace Alternator: 2009-2018 Dodge RAM 1500There are no tightening torques for this operation. Tools Checklist
Common Car Problems You Shouldn’t Delay Fixing
Common Car Problems You Shouldn’t Delay FixingOne of the most common problems with cars is a bad alternator. Some drivers tend to ignore it because they assume they can charge their car batteries. Don’t make the same mistake.
Is an Alternator Rebuild Worth It?
Is an Alternator Rebuild Worth It?A rebuilt alternator generally reuses major parts like the housing, stator, and rotor unless one of these parts is the problem, and sometimes they are. The rotor can be open, the stator windings can be shorted together, and diodes can be bad in the rectifier.
Car Won’t Start After Getting Gas? Here are the Reasons Why
Car Won’t Start After Getting Gas? Here are the Reasons WhyThe key here is “after getting gas,” which should be followed by thinking about whether it happens every time you gas up or just sometimes after getting gas. That’s an important part of the puzzle, you see.
Other Parts To Replace When Changing Your Alternator
Other Parts To Replace When Changing Your AlternatorSince you’ll need to remove the negative terminal while replacing the alternator anyway, go ahead and give the terminals and their posts a good cleaning. Make sure you check the alternator connections for compromised connectors or an oxidized charge post terminal lug. The point is to reduce resistance in all