Get a voltmeter and check the voltage at the charging post of the alternator, that'll help determine if it's an issue of the alt not turning on or and bad ground or blown maxi fuse
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Oh and make sure the truck is running, some people would miss that part :|
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Brandon
2000 Ford ranger 4x4 steppie 3.0
Deep Wedgewood Blue
Cooper Discoverer AT'3 265/75/16
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