Alternator question for 98 GTP

[jcleary82]

Hi, I have a 98 gtp that the alternator went out on. I don't have the money right now for a new one, so calling around a few junk yards I learned they are different for n/a and sc. I can't find any for mine, but plenty for a n/a car. Upon searching both part numbers, I've noticed that all the specs are the same. Can anyone please tell me the difference between them? I'm a single dad and don't have much money. I'd hate to go buy one and it not work. Any help be greatly appreciated.

[Slick2500]

N/A and supercharged use the same alt that junk yard is full of crap. Only one that is different is the 3.1 alternator.

-Edit- Seems I am mistaken.

Pin 3 looks to be different.

GTP Alt

• Pin 1 - Stator
• Pin 2 - Lamp
• Pin 3 - Field Monitor
• Pin 4 - Sense +

GT Alt

• Pin 1 - Stator
• Pin 2 - Lamp
• Pin 3 - Ignition +
• Pin 4 - Sense

[timboku]

A 97/98 non sc alternator will fit a gtp. They are the same..you have to find those years only. The alternator bracket changed in 99+...ebay has them cheap.

[Scottydoggs]

you can use a 99 up alt if you take the alt bracket with it from the junk yard. you'll just need a new pair of elbows.

[Slick2500]

And a new belt.

[jcleary82]

I thought the junk yard was wrong too lol. But I got the same thing from a few different ones. Even looking it up at AutoZone, I get 2 different numbers. Same exact specs, just different part numbers. Don't make no Damn sense. I don't know why a n/a alternator supposedly won't work. I think it will. I guess only way to find out is to try 😱

[timboku]

It will .. I took one off my mom 97 regal ls and put it in buddies 98 gtp. No issues. As long as its coming from a 3.8 it will work.

[1fastam]

Click to Enlarge (2 Reviews)

Pure Energy Alternator Sale Price:$72.63 Quantity: (8) In Stock Part Number: 4735-07136407 Notes: New Condition: New Shipping Options: Ground

This Product Fits the Following:	Warehouse: C
Vehicle Engine • 1998 Pontiac Grand Prix 3.8L V6 Supercharged

www.partsgeek.com

[Turbocharged400sbc]

field sensing and ign + are the same thing, a remote batt voltage refrence to help control the field.

my 97 gtp has a 2004 L26 (na) alternator and bracket, our 442 is using a 98 L36 riviera cs144 alternator with a 99 ssei harness/pcm.

as long as your using the correct alternator for the correct bracket your golden, if you upgrade to the cs144 alternator chassis (external fan/140 amps) youll have to swap the connector.

[Turbocharged400sbc]

also bear in mind only the up level cars actually used more than one pin.

high load cars will get the additional remote power sensing, and the G chassis guys and certain others get a battery thermister lead for extra voltage due to internal resistance changes in the battery

[jcleary82]

Thanks for all the help. I ended up getting one off a 97 lesabre. Looked the same, so I bought it. Brought it home, put it on, and it's been doing great all day!

[jcleary82]

One more thing I did notice is the pin lay out shows 4 wires. My car only has 2. I even pulled the wire loom back to make sure some wires didn't come out.