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Old 07-02-2014, 12:54 PM
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Trailer Running lights work but only if headlights are set to auto

Hello, everyone I'm new here. I have an 06 GCL 5.7L. I just had a towing package installed, brake controller, etc. Problem I'm having is the trailer running lights only work when I switch the headlights to auto position then back to manual parking lights or headlights. If I just turn the switch to parking lights or manual headlights after hooking it up , the trailer running lights do not work. Only until I switch it to Auto headlights then back to the other positions will the trailer lights stay on. If i disconnect the 7 pin round I have to repeat this procedure, switch lights to auto then to parking lights or headlights. I am stumped. Is this normal or did uhaul hook something up wrong? Any help would be greatly appreciated.
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Old 07-02-2014, 04:05 PM
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Re: Trailer Running lights work but only if headlights are set to auto

Anyone???
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