It goes across your core support to a little rectangular box on the driver's fender. There's a terminal lug there, which transitions to the alternator harness; it's your B+ feed on the alternator.

If it's blown, INSPECT that harness on the alternator side. Remember to disconnect your battery first. <img src="/forums/images/graemlins/shame.gif" alt="" />

These older trucks have the insulation fail, and should be periodically checked.

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