Amperage Requirements? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**SactoJim** · 02-28-2007, 08:31 PM

what's the typical amperage requirements for these trucks and what were the stock alternators typically rated at?

I will be adding a couple fans and a decent sound system and just wanted to make sure my current alternator (I think it's 90 amps) will be just fine.

cameeks · 02-28-2007, 09:56 PM

The parts house has them at 60 amps and that is what my camaro had and it had a/c and power windows. so 90 should be great. I'm going with a 100 amp 1 wire later on.

**kwmech** · 02-28-2007, 10:12 PM

I have a non-ac truck and the stock alt ----before the conversion---was rated at 35a

**truckdude239** · 02-28-2007, 10:44 PM

mine was rated at 31 amps new i went with and 70 amp internal reg alt off an 83 k-10 no belt change required or anything just wire 30 mins max if you follow write up

GMC Jim · 03-01-2007, 06:08 AM

Stock alternator on my truck is a 37 amp ( also as listed in 1971 GM Chassis Service Manual as stock. )

02-28-2007, 08:31 PM	#1
SactoJim Registered User Join Date: Oct 2005 Location: Sacramento, CA Posts: 1,970	Amperage Requirements? what's the typical amperage requirements for these trucks and what were the stock alternators typically rated at? I will be adding a couple fans and a decent sound system and just wanted to make sure my current alternator (I think it's 90 amps) will be just fine. __________________ 72 Cheyenne SWB Fleet Nut & bolt frame off in progress...99.9999% - supercharged 383 - 4 wheel discs - relocated fuel tank - My Build Thread

02-28-2007, 09:56 PM	#2
cameeks Long Fleet Club Join Date: Aug 2006 Location: Deer Park, TX Posts: 5,666	Re: Amperage Requirements? The parts house has them at 60 amps and that is what my camaro had and it had a/c and power windows. so 90 should be great. I'm going with a 100 amp 1 wire later on. __________________ Chris Meeks '69 Chevy Custom/10 Long Bed <-- Thread of the work I did before selling. Truck is now finished to the new owners design and running around. I was shown some pictures of the finished product. At least it survived the junk yard. FAQ Index by Krue Site Vendors Subscribe Here Forum Rules

02-28-2007, 10:12 PM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,553	Re: Amperage Requirements? I have a non-ac truck and the stock alt ----before the conversion---was rated at 35a

02-28-2007, 10:44 PM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,234	Re: Amperage Requirements? mine was rated at 31 amps new i went with and 70 amp internal reg alt off an 83 k-10 no belt change required or anything just wire 30 mins max if you follow write up __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

03-01-2007, 06:08 AM	#5
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	Re: Amperage Requirements? Stock alternator on my truck is a 37 amp ( also as listed in 1971 GM Chassis Service Manual as stock. ) __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). Last edited by GMC Jim; 03-01-2007 at 06:08 AM.



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