Quote:
Originally Posted by Davidless
I just looked at some old build sheets on alternator size and SF recommends nothing bigger than 65 amps. Anything bigger may fry the wires and amp meter if there is a problem.
If the wiring hasn’t been updated what size alternator is best to run everything?
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It doesn't matter. Here's why: Even if you had a 500 Amp alternator, that doesn't mean it's pumping out 500 amps. If you have a 40 amp load on the system, and your battery is fully charged, your alternator will be putting out maybe 42 amps. And how many amps will be going through your ammeter? Only two. That said, I am a proponent of a shunt wire around ammeters in our cars. You can read about that in this thread:
Flickering alternator gage.