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I just bought a small alternator and it came with a jumper wire for the field to make it a one wire alternator. It says in the instructions that with the jumper wire the alt. pulls 300mill amps. I could just run a whole new wire for an ignition point but don't want to. So I was wondering if I...

I've heard people putting them on the headlight harness and making the lights use less amps. What do they do and how do they help?