08-31-2015, 06:21 PM
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CC Member
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Join Date: Apr 2015
Location: Prescott,
AZ
Cobra Make, Engine: Classic Roadsters
Posts: 209
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Not Ranked
I have a 100 amp alt in my CR and it barely keeps up with the draw. Does OK with the cooling fan on at an idle but if I turn the head lights on, it drops to 12v or below. If I tried to get by with a standard 75 amp alt, I'd be in trouble.
So it's just marginal with 100 amp but I have a 5.0 EFI motor with electric fuel pump and 17" cooling fan. It's a good thing I don't drive the car much at night. In addition, the older Ford alts don't put out much of their capacity at idle. You'll need to use a newer alt for that. My alt guy recommends a newer, compact GM 1 wire. He says these put out more amps at idle than the old Ford alts but you'll need to have it re-clocked to fit in the customary position in front of the passenger side head.
I hope that helps...
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Thanks,
Joel Heinke (early 90's CRL Cobra)
Last edited by C5GTO; 08-31-2015 at 07:50 PM..
Reason: changed to 100 amp after looking it up
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