Stock amps of an 87 alternator? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C&C Chevy · 07-18-2003, 08:39 PM

Whats the stock amp rating of an 87 alternator? Mine doesn't have a sticker or anything on it. Probly been replaced. How can I measure the amperage??

C&C Chevy · 07-18-2003, 11:30 PM

Anyone have a guess? I'm itchin' to put some electric fans in but I need to know the least amount of amps I can have.

CT-Truckster · 07-19-2003, 11:33 AM

just a guess i would say 60 something, seems like all the stock alternators i ever put on our trucks was i think 64 or something like that, but its just a guess.

78SilveradoSWB · 07-19-2003, 12:46 PM

If it helps, my 78 C-10 has the optional hi-output alternator which is rated at 55 amps. Just ordered a 180 amp. one to take care of future needs and upcoming dual electric fans.

C&C Chevy · 07-19-2003, 01:20 PM

O'reilly's has a reman. AC Delco 100 amp. for $44 plus core. Does that fall under the "get what you pay for" slogan?

78SilveradoSWB · 07-19-2003, 02:29 PM

Depends on the warranty. The one I am buying has a 2 year warranty. $44 is not a bad price.

bigd65 · 07-20-2003, 08:53 PM

i got mine for i believe an 88 and its a 150 amp. serpentine. most of them are of the same amperage. i think you will need at least 100 amp to run electric fans and AC. BTW mine is from AUTOZONE and cost 150.00 bucks with a lifetime warranty.

Grim Reaper · 07-23-2003, 02:30 PM

Quote:

Originally posted by bigd65
i got mine for i believe an 88 and its a 150 amp. serpentine. most of them are of the same amperage. i think you will need at least 100 amp to run electric fans and AC. BTW mine is from AUTOZONE and cost 150.00 bucks with a lifetime warranty.

88 with factory tow package would have been 105. Just had mine rebuilt last week.

07-18-2003, 08:39 PM	#1
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Stock amps of an 87 alternator? Whats the stock amp rating of an 87 alternator? Mine doesn't have a sticker or anything on it. Probly been replaced. How can I measure the amperage?? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-18-2003, 11:30 PM	#2
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Anyone have a guess? I'm itchin' to put some electric fans in but I need to know the least amount of amps I can have. __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-19-2003, 12:46 PM	#4
78SilveradoSWB Senior Member Join Date: Apr 2002 Location: Beaverton, OR Posts: 1,615	If it helps, my 78 C-10 has the optional hi-output alternator which is rated at 55 amps. Just ordered a 180 amp. one to take care of future needs and upcoming dual electric fans. __________________ Mitch 1978 Chevrolet Silverado C 10 454 BB, TH400

07-19-2003, 01:20 PM	#5
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	O'reilly's has a reman. AC Delco 100 amp. for $44 plus core. Does that fall under the "get what you pay for" slogan? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-19-2003, 02:29 PM	#6
78SilveradoSWB Senior Member Join Date: Apr 2002 Location: Beaverton, OR Posts: 1,615	Depends on the warranty. The one I am buying has a 2 year warranty. $44 is not a bad price. __________________ Mitch 1978 Chevrolet Silverado C 10 454 BB, TH400

07-19-2003, 11:33 AM	#3
CT-Truckster ? Join Date: Jul 2002 Location: Dyersburg, TN Posts: 471	just a guess i would say 60 something, seems like all the stock alternators i ever put on our trucks was i think 64 or something like that, but its just a guess.

07-20-2003, 08:53 PM	#7
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	i got mine for i believe an 88 and its a 150 amp. serpentine. most of them are of the same amperage. i think you will need at least 100 amp to run electric fans and AC. BTW mine is from AUTOZONE and cost 150.00 bucks with a lifetime warranty. __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe



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