I tow a Moragan two horse slant. When I tow with my Silverado 2500hd all the inside lights work. Dressing room and horse area. When I tow with my Tahoe, they don't. The Silverado has 7 wires at the plug, the Tahoe only 6. Tahoe does not have a center orange wire in the harness. What do I need to do to get power to the lights when towing with the Tahoe.41
Posted 2005-05-30 5:49 PM (#25845 - in reply to #25842) Subject: RE: Trailer Wiring
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Posts: 1416
Location: sc
are you saying there are only 5 wires at the back of your 6 pin plug? the 12v may be another color.
if a 12v wire is not avaliable at the harness on the tahoe, youll need to run a wire from the battery to the plug. 10 gauge wire with a 30 amp breaker would be appropriate, zip ties to hold it and wire loom to protect it, along the frame on its way back to the plug. nothing to it.
who put the 6 pin on the tahoe? id be a little hacked if someone did half a job.
Posted 2005-05-30 6:57 PM (#25851 - in reply to #25845) Subject: RE: Trailer Wiring
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Posts: 2689
It isn't clear from your post whether you have a 6 or a 7 pin plug on the Tahoe, i.e. is it a 7 pin plug with only 6 pins connected ? I think it SHOULD be a 7 pin and I'm reasonably certain that a +12Volt always hot should have been there once upon a whenever. It should certainly exist in the harness, I'd check around to see if a previous owner (or ignorant trailer sparkie) has hacked it off for no good reason.
Posted 2005-05-30 7:00 PM (#25852 - in reply to #25842) Subject: Trailer Wiring
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Posts: 7
Location: Vista,Ca.
The Tahoe has a 7 pin plug, but the factory harness only has 6 wires in it. I have cut back the covering to look the 7th wire, it's not there. So I should just run a hot wire from a 30 amp breaker to the back and tie it in at the plug? Thanks for your help.
Posted 2005-05-30 7:06 PM (#25853 - in reply to #25842) Subject: RE: Trailer Wiring
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Posts: 2689
What year is your Tahoe ?
I'll call my son to find out what year his is, I know for CERTAIN that one has the same 7 pin wiring as my truck, the GM standard 7 pin WITH a +12V always hot.
Posted 2005-05-30 7:17 PM (#25854 - in reply to #25842) Subject: Trailer Wiring
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Posts: 7
Location: Vista,Ca.
It's a 2000, I checked all the pins with the key off, the white wire is hot. And there is no wire to the center pin. It appears that the plug has never been messed with. I have owned the car for about 2 years.
Posted 2005-05-30 9:01 PM (#25858 - in reply to #25842) Subject: RE: Trailer Wiring
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Posts: 1416
Location: sc
well this is sort of difficult not being there and all, but white is generally a ground, and post 1 on my 7 way rv plug chart is also a ground. do you have a red wire on the back of the plug?
also you stated there is no wire on the center pin, if im not mistaken that is for the "backup lights", strange but probably not relavant to this situation.
now im going to take a shot in the dark (pun intended) here.... on my 2002 chevy trailblazer the 12v hot wire was not connected to the fuse block under the hood, as it came from the factory. as i came to understand it, after hours of cussing, tracing wires, checking fuses and haynes manuals, etc this was to keep newbie trailer pullers from discharging the trucks battery by leaving something on in the trailer.
i would suggest checking the owners manual for the location of the trailer power fuse, on mine it was marked only "trailer fuse" and is a 30 amp. if its under the hood, check if there is a stud next to the fuse, and possibly a ring terminal on a red wire in the general area. now im not telling you to start touching wires to the battery, im only sharing my experiance.
Posted 2005-05-30 9:14 PM (#25859 - in reply to #25842) Subject: Trailer Wiring
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Posts: 7
Location: Vista,Ca.
My misatake, the white was ground and the black is hot. I have an empty fuse holder under the fuse cover under the hood. I will look for a wire not connected, and tone it out. thanks for all your help. If I can't find it I will take to my local trailer repair shop.
Posted 2005-06-02 9:33 PM (#26027 - in reply to #25842) Subject: RE: Trailer Wiring
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Posts: 70
Location: Spanaway,Wa
I don't know if you still checking this but chevy usually leaves out the fuse that powers the internal lights on your trailer. I'm not sure if thats the case with your rig but it's worth checking. I bet it's not there. If you swing by your local dealer they should throw one in for free.
Posted 2005-06-03 2:54 PM (#26049 - in reply to #25842) Subject: Trailer Wiring
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Posts: 7
Location: Vista,Ca.
I do have a vacant fuse holder, one of the really big ones in the electrical panel. I took a fuse "40amp" and installed it in the empty whole,(all the way to the left side). It did not fire up any pins at the plug. Which color wire supplies voltage to the inside trailer lights?