I'm wanting to upgrade the alternator on my 66 to a 100 amp unit. I'm currently running an older 63 amp GM alternator with built in regulator. It's works fine until I turn the A/C on and with the blower fan running, the volts drop to 12.5 and if I kick it up on high I'm down to 12. I don't run it that much but when I do, I don't want the battery going dead. I've read conflicting information regarding wire size for the charging wire. Some say 8 ga. while others say 10 ga. is fine if you're not running a lot of accessories which I'm not. I currently have a good 10 ga. wire running from the alternator to the horn relay, then from the relay to the battery. I would rather not have to pull the harness out and unwrap it to replace wires. Also, I have a set of the old style reproduction battery cables and the charging wire is made into the end. I don't want to change them either. Will the 10 ga. wire be enough or should I try an 80 or 90 amp alternator instead?
tider66
Charging Wire for 100 amp Alternator Upgrade
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1,110 Posts
No more than 2 feet, maybe less. The alternator is in the stock location and so is the horn relay. As far as the sensing wire, I thought I had it run to the post on the starter but after looking at it today, I think it's actually going to the horn relay. It's been nearly 10 years since I did it. The wiring harness is the original.
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