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05 STS
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21 Posts
Discussion Starter #1
I just installed a curt hitch on my 05, wondering if anyone knows which taillight wires I need to hook up the trailer lights? Thanks
 

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2006 STS4 V8 1SG & 2007 STS V8 1SE
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8,178 Posts
You need one of the higher-end 'smart' isolation units to convert the trailer lighting from the GM 4-wire + ground and LED system and also run power from the front fuse box. Typical trailer wiring is ground & 3 wires: the tail/running lights, a combination left/brake light and the right/brake light. The STS (like most GM cars) has ground plus 4: tail/running, left turn, right turn & brake lights.

On an STS, you may pay more for professional wiring installation than the hitch.
 
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