American Auto Wire
Username Post: 12V to coil when starting
drummertom 
Member
Posts: 1957

Age: 68
Loc: Reidsville, NC
Reg: 09-03-06
09-01-21 05:57 AM - Post#2826371    
    In response to drummertom

I figured out an easy way to do this, for me anyway. I took a normal 4 pin 12V relay and wired it in. Pins 85 and 86 are your pick or activate pins. One has to be ground, and the other goes to your starter wire. Polarity doesn't matter here because all you are doing is picking the relay. + voltage should come from the start position on the switch, or from the starter terminal on the starter. Pin 30 is your 12V input, which can be either switched, or constant (Battery). It won't drain the battery since it will only be used when the starter is active. 87 should go to the P or + side of the coil. When you engage the starter, the relay will pick and supply 12V to the coil. When you release the switch, relay opens, drop 12V to the coil and you are running on the reduced voltage. Of course, I strongly recommend fusing the 12V input to pin 30. Yeah coming off the R terminal on the starter, but mine and most high torque starters don't, so this is an easy solution.
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