Alternator question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Russell · 08-31-2004, 12:50 AM

Hey guys!

I just picked up a serpentine belt setup, but the alternator is both fried, and has like 5 wires instead of the three my truck has, it came off an 89 chev pickup. Now, what I need is an alternator that is at least 100 amps, and is of a three wire operation type. What car should I be looking for to get one from?

81shavedtrk · 08-31-2004, 12:54 AM

Most stock alternators are at most 80 amps or so. As far as I know. the 3 wires, one is power, one is guage, and one is field.

Russell · 08-31-2004, 12:59 AM

80 amps isn't enough juice... My truck is gonna be running a LOT of electronics, which will be sensitive to surges, so I gotta be putting out at least 100 amps at an idle

bluex · 08-31-2004, 01:22 AM

I bought an adapter from an electrical shop to run a newer style alt on mine when I was running lots of stero and extra lights and stuff. I never installed it, I went with an isolator and another battery. As far as I know its still in the truck. I will look tomorrow and get back with you. (its raining now and dark too). I think I gave like $15 for it if you would be interested in it.

Russell · 08-31-2004, 01:26 AM

If there isn't a stock 100 amp alternator that runs off a 3 wire setup, I'll probally pick up your adapter, I'll let ya know

bluex · 08-31-2004, 01:47 AM

No problem. If I can find it I'll snap a pic of it for ya too. Thinking more about it, its just a pigtail and the guy told me/wrote on the package what wires to hook where. I'll let you know more tomorrow. I think with my dual batteries I picked up a 100 amp alt. from NAPA too though. Might have been 90-95 amps though.

Its stopped raining and this is bothering me, I might go look for it anyways.

Jonboy · 08-31-2004, 08:36 AM

What about running one of the Powermaster 1 wire alternators or something similar? It seems like using a higher amp alternator will be just as expensive to get.

RockHQ · 08-31-2004, 08:53 AM

Good luck finding an alternator that puts out 100 amps at idle.

But, here's a good start (that's 32 POUNDS of alternator, one HUGE mofo that will run 215 amps constant):

http://www.alternatorparts.com/dual_...r_big_ford.htm

If you make do with a little less juice, see here (will bolt up to your existing brackets too):

http://www.alternatorparts.com/Doubl...fier_cs144.htm

Russell · 08-31-2004, 11:06 AM

Hmm... If I think about it, most newer cars will be running just as much, if not more electronics than my truck, so I guess most car's alternator should be fine... I'll go to the wrecking yard and see what I can find.

08-31-2004, 12:50 AM	#1
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Alternator question Hey guys! I just picked up a serpentine belt setup, but the alternator is both fried, and has like 5 wires instead of the three my truck has, it came off an 89 chev pickup. Now, what I need is an alternator that is at least 100 amps, and is of a three wire operation type. What car should I be looking for to get one from? __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

08-31-2004, 12:59 AM	#3
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	80 amps isn't enough juice... My truck is gonna be running a LOT of electronics, which will be sensitive to surges, so I gotta be putting out at least 100 amps at an idle __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

08-31-2004, 01:22 AM	#4
bluex Registered User Join Date: Jun 2004 Location: Spartanburg, SC Posts: 1,963	I bought an adapter from an electrical shop to run a newer style alt on mine when I was running lots of stero and extra lights and stuff. I never installed it, I went with an isolator and another battery. As far as I know its still in the truck. I will look tomorrow and get back with you. (its raining now and dark too). I think I gave like $15 for it if you would be interested in it. __________________ Paul '78 GMC Serria 15 Heavy Half. 361/NV3500/3.73. Former LWB NV3500 swap Trailing arm swap '98 ECSB Z71 daily driver -traded '03 burb. Family cruiser http://upstategmtrucks.com/

08-31-2004, 01:26 AM	#5
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	If there isn't a stock 100 amp alternator that runs off a 3 wire setup, I'll probally pick up your adapter, I'll let ya know __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

08-31-2004, 01:47 AM	#6
bluex Registered User Join Date: Jun 2004 Location: Spartanburg, SC Posts: 1,963	No problem. If I can find it I'll snap a pic of it for ya too. Thinking more about it, its just a pigtail and the guy told me/wrote on the package what wires to hook where. I'll let you know more tomorrow. I think with my dual batteries I picked up a 100 amp alt. from NAPA too though. Might have been 90-95 amps though. Its stopped raining and this is bothering me, I might go look for it anyways. __________________ Paul '78 GMC Serria 15 Heavy Half. 361/NV3500/3.73. Former LWB NV3500 swap Trailing arm swap '98 ECSB Z71 daily driver -traded '03 burb. Family cruiser http://upstategmtrucks.com/

08-31-2004, 12:54 AM	#2
81shavedtrk Registered User Join Date: Jul 2004 Location: El Dorado, KS Posts: 94	Most stock alternators are at most 80 amps or so. As far as I know. the 3 wires, one is power, one is guage, and one is field.

08-31-2004, 08:36 AM	#7
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	What about running one of the Powermaster 1 wire alternators or something similar? It seems like using a higher amp alternator will be just as expensive to get. __________________ 1974 Jimmy- 5.3/4L80e/NP241

08-31-2004, 08:53 AM	#8
RockHQ ROCKET POWER! Join Date: Feb 2003 Location: Finland, Europe Posts: 509	Good luck finding an alternator that puts out 100 amps at idle. But, here's a good start (that's 32 POUNDS of alternator, one HUGE mofo that will run 215 amps constant): http://www.alternatorparts.com/dual_...r_big_ford.htm If you make do with a little less juice, see here (will bolt up to your existing brackets too): http://www.alternatorparts.com/Doubl...fier_cs144.htm __________________ What did i do last nite? I had a wonderful time, That's what they tell me What did i do last nite? 1979 C-10 shortfleet: Olds 350, Th400, 12 bolt Current project: 1969 Olds 455 W-30, needing a rebuild

08-31-2004, 11:06 AM	#9
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Hmm... If I think about it, most newer cars will be running just as much, if not more electronics than my truck, so I guess most car's alternator should be fine... I'll go to the wrecking yard and see what I can find. __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

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