Introduction
Even though 2007-2014 Chevrolet Suburbans come with a trailer tow package, the manufacturer has neglected to connect the wire that enables the 12-volt auxiliary pin on the 7 pin connector. This technique allows tail lights and blinkers of any tow-behind trailer to be powered by the vehicle. It will also power any other appliances that may be in the trailer such as refrigerators or microwaves. This is an easy fix that may cost $75-100 for a professional to execute.
What you need
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Locate the wiring harness bundle, which exits the firewall underneath the brake booster.
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Identify the auxiliary wire, which is folded and taped to either the wiring harness or the fire wall.
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Place the ring terminal (washer end) of the wire on the right post located at the front of the battery.
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Place the 10 mm washer on the post.
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Tighten the washer using a 10 mm wrench, crescent wrench, or pliers.
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After hooking up the wire, check to make sure the 40 amp fuse is installed for the auxiliary pin.
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