When I added a brake controller to my 99 Windsor I found several spare wires. One end of the bundle were in the drivers lower kick panel and the other along the harness on the passenger side of engine. A signal tracer will help. These wires were too small for a 45ft run to the trailer brakes for my application so I ended running a blue #8 using the unused conduit from front to back. I hope this helps
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2005 Safari Panther Diamond IV Cat C13
2013 Avalanche Toad
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