13 Tahoe - Factory Towing Wiring Question

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lrg51

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I purchased a used 13 Tahoe and wanting to tow light weight trailer. When I install 7 to 4 adapter to connect 4 flat wire harness... it appears that the only power I'm getting is to turn signal on trailer. No parking, 4 ways, running lights or right turn signal on trailer.

I've heard that Chevy doesn't connect all wiring on the towing system at the factory. I would think that the towing connection would be wired for a simple 4 wire adapter and should work right out of the factory.

Anyone know anything about this? I'm stumped trying to get power to the 4 wire adapter.
 
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