Back in the days of when, the wire that hooked to that post marked "coil" was energized while the starter was engaged (only), bypassing the resistor wire that normally fed the coil with 6 volts, and instead fed it 12v - basically for enhanced starting in tough conditions.
Today, that post not used much - if it's even there.
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1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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