87 (red wire) connects to the positive wire on the electric fan. 30 (other red wire) needs constant 12-volt power from the battery. 86 (gray/white wire) goes to the ignition switch.

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Note how the single 10-guage feed wire from the PWM has been split to feed the two smaller fan positive wires. The same goes for the black negative (ground) wire. See All 14 Photos ...