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Old 04-03-2011, 03:40 PM
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4ga vs 2ga battery cable, also insulation on wire

I am replacing the battery cables on my 68 caddy since the stock ones are crap. Well at least the positive cable from the battery to the starter solenoid. The other one, the ground, is pretty solid and a bit harder to replace because of where it hooks up to the frame/body. I can get 4Ga wire that is red so it would look a little better and be easier to tell the wires apart. But I can get 2ga wire if it would be better electrically. Which should I get?

Also the stock wire had a bit of heat insulation around it down where it passed near the exhaust manifold. Would it be a good idea or maybe even necessary to get some insulation around it down there?

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Old 04-03-2011, 03:52 PM
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bigger is better in this case. go with 2ga (mine are 0ga)
try to route it away from the manifold. use wire ties or straps.
my neighbor's starter cable welded itself to the manifold, not good...
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Old 04-03-2011, 05:45 PM
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The wire size is predicated on the distance from the battery and the starter post and the amperage consumption of the vehicle. Equally important is the size wire from the alternator to the starter post for recharging purposes and this size gets bigger (smaller number) also when the distance from the battery to starter gets longer.

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Old 04-03-2011, 07:21 PM
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Thanks, it is just going to be a little longer than stock, or what was left of the stock one. The end had been kind of butchered and the clamp would not stay attached to the wire very good. Based on the gunk at the other end I think it was the original cable or a very old replacement. Not sure if the battery terminal end of it is stock or not.

There is a clamp bolted to the frame to route it away from the manifold. But I was thinking it might be good to do a bit more.
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