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Old 04-10-2014, 11:58 PM   #1
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TV wiring issue

I originally posted that my backup lights were not working on my AS. But I have traced the issue to my TV.

I got a trailer emulator and sure enough there's no power to my backup lights or 12v power line. All the other lights work. Any ideas on the issue? It's a 2005 silverado with GM factory installed HD hitch/harness. I checked the fuses and they are fine. I don't know what to check next. Here's a pic of the back of the plug. All 7 wires are seated and the light green wire is in the center, which is correct for backup lights. I'm lost.

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Old 04-11-2014, 01:22 AM   #2
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Did you check both fuse boxes? The trailer hot line is protected by a fuse under the hood.

I imagine you did , but I thought I might mention it anyway.
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Old 04-11-2014, 07:31 AM   #3
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How many fuses do I need to check for backup lights and 12v power?

The TRL B/U fuse is under the hood. 10amp. Checked that.

STUD 2 says it's for accessory power/trailer wiring brake feed. 30 amp. Checked that.

Would there be another that I don't recognize?

STUD 1 has a plastic dummy fuse in it. It says its for "auxiliary power (single battery and diesels only)/dual battery (TP2) Do not install fuse." It's not diesel but I have no idea if it applies to me otherwise.

??
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Old 04-11-2014, 08:29 AM   #4
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I think it is STUD 1 that's the 12v. Google says so.
Going to get a new fuse...
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Old 04-11-2014, 09:16 AM   #5
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Yep the 12v works now but I still have the backup light issue that I can't figure out...
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Old 04-11-2014, 11:02 AM   #6
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The backup lights use what used to be called the AUX post (center post) in the umbilical cord. Not all TV's have that connected to the backup light circuit. If it is the backup lights on the TV, it should be protected by a fuse, as should the turn/stop lights and running lights.

Do you have one of these?

Amazon.com: IIT 16693 7 Way Trailer Connector Circuit Tester with 6 LED: Home Improvement

Chris
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Old 04-11-2014, 06:56 PM   #7
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Let's see a seven wire plug right?

1 trailer hot line
2 ground
3 tail lights
4 running lights
5 left turn
6 right turn
7 brake signal

There isn't any space left for backup lights,

You could consolidate the tail and clearance lights to make space.
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Old 04-11-2014, 09:05 PM   #8
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TV plug is wired correctly with the backup light wire in the center. I checked GMs colors and specs and checked the wires and it's even stamped on the cover to my TV plug. I do have a trailer emulator/tester, that's how I know I have no power for that center circuit.
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Old 04-11-2014, 09:44 PM   #9
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Are you sure the b/u fuse in the TV is good? And is it the b/u fuse that runs the circuit to the plug? I know our truck has separate fuses for all the circuits going to the trailer plug.


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Old 04-11-2014, 09:50 PM   #10
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Even though it didn't look bad, I replaced the 'TRL B/U' fuse which according to my manual is for the trailer backup lights. If there is another fuse then I am not sure which one to look for.
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Old 04-11-2014, 09:53 PM   #11
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Quote:
Originally Posted by J. Morgan View Post
Let's see a seven wire plug right?

1 trailer hot line
2 ground
3 tail lights
4 running lights
5 left turn
6 right turn
7 brake signal

There isn't any space left for backup lights,

You could consolidate the tail and clearance lights to make space.
Not exactly. The standard 7 pin wiring is:


1 white - common ground
2 blue - brakes
3 green - running/tail lights
4 black - battery (+12v)
5 red - left turn/stop light
6 brown - right turn/stop light
7 yellow - backup/aux


Chris

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Old 04-11-2014, 10:04 PM   #12
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Quote:
Originally Posted by merrypaws View Post
Even though it didn't look bad, I replaced the 'TRL B/U' fuse which according to my manual is for the trailer backup lights. If there is another fuse then I am not sure which one to look for.
That's got to be the right fuse. A couple of ideas. Do you have a VOM? Or a test light with a skinny probe?

Use the test light to see if you're getting power to the fuse when in reverse. Be careful doing this. To check, pull the fuse, and use the probe of the test light to carefully check both contacts where the fuse plugs in. If the light does not light, then the problem is the circuit feeding that fuse. If the light does light, then the problem is between the fuse and the trailer plug.

Assuming that you have power to the fuse, then I'd open up the trailer plug and see if the wire is actually connected to the stud inside. If it is, or if you've done that already, then you'll have to try and trace the wire from the fuse box to the plug and locate the break. Not a fun task. Might be easier to run a new wire.

In a much older TV, I ran a wire directly from the driver's side b/u light to the trailer plug to get b/u lights on my SOB trailer. Did that years ago. If you do that, an in-line fuse in the wire would be a good idea.

Good luck!

Chris
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Old 04-11-2014, 10:30 PM   #13
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That may be Airstreams color scheme, but it is not typical trailer , at least not the trailers I have worked on for the past thirty years.

Brown tail
Black top running lights
Yellow left turn
Green right turn
Red trailer hot line
Blue trailer brakes
White ground

It makes sense that the extra wire could be picked up by consolidating the top and bottom running lights.

GM used this color scheme for years also, and in any case, my trailer is wired according to the standard I listed above although it may have been wired according to the standard you listed above I didn't pay it much mind when I ripped it out...
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