Join Date: Jan 2004
Location: Winston Salem, NC
Re: Wiring help- new alternator
I have a 68 with a/c which in the past has been upgraded to a 10si 63 amps. Along wi the upgrade the wiring from the alternator to the battery was upgraded to 8 gauge. the alt is loosing a bearing so I'm going to upgrade to a 12 si 93 amps. My question is about wiring.
1. Should I upgrade to 4 gauge with an 80 amp fuse?
2. If I re-wire can I run a new line directly from the alt to the battery bypassing the horn relay and the passenger side junction box but keep the old 8 gauge line connected to the battery kind of letting the current backfill the horn relay? I was thinking that the relay and/or junction box would be weak links for the beefed up amps.
1- no need to upgrade to 4 AWG. 8 should be more than plenty
2- Do not do this, they are not weak links. Also, when you add fans later on, etc. wire them with a relay and have the main power feed come from the horn relay buss bar for optimal performance.
With just AC and HEI, a 78 amp would still give you room to grow with an electric fan IMO.
69 Camaro, 3650lbs., 400ci, TH400, Coan 10" converter, 3.50 gear
D1SC, pump gas, street car, Water/Meth injection
1.302 60', 5.956 @ 116.4 Super Sniper EFI 2019