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I am also going to have to use a beefier relay to bypass the IGN switch. I don't know of any relay that the arduino can power that will handle the amperage spike. The IGN relay is only powering up the starter solenoid, not the starter itself. So, it doesn't have to handle 100+ amps. I figure a normal 30A automotive relay should work fine, and I'll power up the relay coil with a mosfet.
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