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Old 03-26-2009, 06:41 AM   #1
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1975 25' Tradewind
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7 pin plug, no power to backup lights on truck

I am at a lose and hope someone can help, I have a 2005 Silverado.
I am hoping I am just missing something, I was checking to make sure all the exterior lights work and I can not get the backup lamps to work. The problem is with the truck not the trailer.
I unplugged the camper and tested the center pin of the 7 pin trailer plug thats on the vehicle and I get nothing, is there a fuse I am missing, anyone have any ideas why this does not work.
The reverse lights on the truck work fine.

Your help is much appreciated.
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Old 03-26-2009, 07:12 AM   #2
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Bmklawt,
I had a similar problem, but mine was with my marker lights and turn signals. I had grounded out the lights and signals when replacing the fixtures and blew two fuses in the truck. They were in the fuse block on the side of the dashboard at the door jam on the driver's side. Mine is an '06 GMC Sierra.

I just got my owners manual out and looked at the fuse block section and could find no reference to any back up light fuses for the truck or the trailer plug.

You may want to test / reseat all the fuses in that fuse block in the door jam.

Please let us know what you find.
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Old 03-26-2009, 07:20 AM   #3
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Bmklawt,
Are you sure the trailer plug has the backup lights wired at the trailer plug? When we got our '87 from Ohio the backup wire was not connected. It was in the wire loom, but never attached to the center terminal. I hooked it up and I had backup lights on the trailer.

I think you can test the backup ligts by using a suitable guage wire and jumping the #4 (12V) terminal and the center (auxilliary/backup) terminal.

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Old 03-26-2009, 07:57 AM   #4
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Quote:
Originally Posted by DEITZ645 View Post
Bmklawt,
Are you sure the trailer plug has the backup lights wired at the trailer plug? When we got our '87 from Ohio the backup wire was not connected. It was in the wire loom, but never attached to the center terminal. I hooked it up and I had backup lights on the trailer.

I think you can test the backup ligts by using a suitable guage wire and jumping the #4 (12V) terminal and the center (auxilliary/backup) terminal.

An interesting tidbit here....I've always seen the digrams displayed just like DEITZ645 has shown, but I've always seen the sockets MOUNTED with the key at the top. So, when testing either keep that in mind, or just go by the pin numbers and not the location.
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Old 03-26-2009, 08:21 AM   #5
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An interesting tidbit here....I've always seen the digrams displayed just like DEITZ645 has shown, but I've always seen the sockets MOUNTED with the key at the top. So, when testing either keep that in mind, or just go by the pin numbers and not the location.
SteveH,
You are correct. The colors and positions are correct, but the key way is 180 out of synch. The key way should be on the top. I have been searching the net for a schematic with the key way in the proper location, but they are all displaying at the bottom. I even ran out to the truck and trailers to make sure I wasn't suffering from delerium.

Did something change that we don't know about???
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Old 03-26-2009, 08:24 AM   #6
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Are all the connectors and fuses installed in your truck? There were several on our Silverado that were never hooked up, but left dangling. The battery feed, trailer brake, and another one (can't remember which, it's too early in the morning) were unhooked/not connected in the main fuse panel under the hood.
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Old 03-26-2009, 08:36 AM   #7
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Old 03-26-2009, 08:36 AM   #8
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Are you sure it's the truck? Airstream wired the trailers different back them. Pic thanks to Dennis 87MH. This was the standard from 1966 to 1981
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Old 03-26-2009, 08:40 AM   #9
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Originally Posted by DEITZ645 View Post
SteveH,
You are correct. The colors and positions are correct, but the key way is 180 out of synch. The key way should be on the top. I have been searching the net for a schematic with the key way in the proper location, but they are all displaying at the bottom. I even ran out to the truck and trailers to make sure I wasn't suffering from delerium.

Did something change that we don't know about???
Don't know, but if you are not being very careful, it's real easy to get it messed up.

What I do to keep it straight, is just go by the pin numbers, and that way I've always been successful.

To the original poster....I would bet your tow vehicle does not have the backup lights wired. I've seen lots that don't.
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Old 03-26-2009, 10:03 AM   #10
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Thanks everyone for the help,

I finally found the wiring schematic for the trailer wiring in the service manual and it does show a fuse for the backup lights under the hood. There is no mention of trailer wiring in the index so I went through 900 pages of print twice and found it.
I went back under the hood and found fuse "TRL B/U" that makes perfect sense now.
I had checked that fuse earlier and it checked good, I had looked in the owners manual but must have missed it, it is there.
When I check the fuse earlier with a fuse checker it checked good, after finding the info in the book I went back to the TRL B/U fuse and actually pulled it out, it looks good so I tested it with the fuse checker while holding it in my had and found that there was break in the fuse.
I put an ohm meter on the pins of the fuse and it read open and when I jiggled the pins of the fuse I could get an intermittent reading so I replaced the fuse and all is well.

10 hours of my life down the tubes because a fuse was bad
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Old 03-26-2009, 10:24 AM   #11
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Our '66 does not have backups. I was considering on installing a couple a couple of years ago so first I searched for the wire in the coach. The wires are there in the back between the walls where back ups would be installed. However there was no lead at the center connection in the 7 pin plug. Later I discovered the wire terminated about 6" from the plug in the cable. I had bought the lights but decided not to install them as I do not 'plan' to drive at night. For that perhaps one time, Lynn, with a flash light will be the alternative.
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Old 03-26-2009, 10:27 AM   #12
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Quote:
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10 hours of my life down the tubes because a fuse was bad
Bmklawt,
Been there, done that, bought the T-Shirt. Same thing happened to me when I grounded out my marker lights. I thought..."It couldn't be a fuse." Troubleshooting 101..."START SIMPLE"

Glad you got it figured out.

I scanned the two fuse block (under hood and instrument panel) pages in my '06 GMC Sierra's owner's manual and have attachedthem here in the hopes that it will help somebody in the future. Remember look for all possible fuses
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