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The 1999 Silverado we&#8217re using as a tow vehicle had a positive battery junction box located behind and below the alternator. We connected the cable to one end of the supplied relay block and the other end of the block to the junction box terminal.
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The 1999 Silverado we’re using as a tow vehicle had a positive battery junction box located behind and below the alternator. We connected the cable to one end of the supplied relay block and the other end of the block to the junction box terminal.  View Related Article