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so update : I talked to the alternator guy that is handling the warranty/ repair work for the company I purchased my alternator from. He said there was a problem with the regulators hanging open. He sent me a new regulator I put it in. Still no charging. Now I know all of you alternator pros...

Can you explain this OMM &the switch set up?

I have only one battery. I do have a fully charged spare. When I found one dead, I changed swapped it out. That one drained as well. My father in-law checked it and just said no it isn't charging. I trust him because his years of racing experience and being a master mechanic. Alternator is...

So I went out and did some measuring. Crank pulley 5.75" alt 2.5". So if I did it right the alternator shaft is turning 15,400 rpm's, and will have to spin even faster when I take it to the track. At the strip I estimate turning anywhere from 6200 to maybe no more than 6800. I talked to the...

Wow that is a lot. This engine hasn't even been raced yet. That rpm was just to test rpm limiters. This was supposed to be a drag race alternator.

Crank pulley is 7" alt pulley 2". Don't know the math. 8ga wire.

I haven't even spun this engine past 5500 rpm. I ordered a new disconnect switch with alt disconnect. We will see how that goes

I thought the same thing, but was told that wasn't happening. A friend said a diode went out, but on every starter?

so I have a strictly race 64 dart. 496ci engine with a 1 wire 90 amp alternator. Wire from alternator to battery. No disconnect in-between. Not sure what is going on but my alternator's keep going out. They quit charging after only an hour or 2 of total run time. On top of that my batteries are...