I always put a Ford type selinoid in the circuit. This takes all the load off the ign. switch & compensates for any resistance. Mount it close to the starter & run a 10-12 gauge wire from the main bat cable connection to a large post on the selenoid. Connect the start wire from the switch to the S term. Run a 10/12 gauge wire from the S term on the selenoid on the starter to the other large post. You can also use the I term for a bypass .


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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