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Old 08-31-2016, 05:28 PM   #1
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Question Wiring issue, 1985 T1950, wiring diagram available?

I have a 1985 T1950. There's a gray wire in the camper's harness that's not connected to the plug that goes into my truck. I need to reconnect it, but not sure to where in the plug. Is there a camper wiring diagram I can download or view on line somewhere?
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Old 08-31-2016, 07:04 PM   #2
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My guess if every thing else works reverse lights. It will go the the center pin there is no set color for the reverse light red,purple,orange or in your case probably gray.
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Old 08-31-2016, 09:12 PM   #3
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Quote:
Originally Posted by dbwiseman View Post
I have a 1985 T1950. There's a gray wire in the camper's harness that's not connected to the plug that goes into my truck. I need to reconnect it, but not sure to where in the plug. Is there a camper wiring diagram I can download or view on line somewhere?
Open up the connector and determine which terminal doesn't have a wire on it. That will be your answer. There is a drawing of the 7 way connector in the files area with everything labeled.

Just be aware that not all 7 pins on the vehicle side may be connected. You'll have to check with a multimeter or test light to be sure. On older vehicles, it was common not to wire the reverse lights. Newer vehicles like my '12 F250 have all the wiring connected up and functional right from the factory, provided that all fuses are in place.

And, unless there are backup lights on the trailer, that 7th wire may not be connected to anything on the trailer side. The pigtails on the travel trailers always used 7 wire cable, even if the reverse lights were non-existent.
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Old 09-01-2016, 07:25 AM   #4
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Most modern factory TV wiring will have a reverse signal (home made probably not) and you don't usually see backup lights on campers any more but the reverse signal is used for surge brakes often found on boat trailers and UHaul stuff it is a disconnect for the surge brakes so you can back the trailer up. Older campers are more likely to have reverse lights than some thing newer my 1990 has reverse lights frankly the only reason I can see is just to let some one know you are going to backup because other than that they are pretty worthless.
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Old 09-01-2016, 04:06 PM   #5
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Thanks for the replies. While one lens on each side is clear in the middle, it does not appear to have back up lights, each bulb is a double element. Not sure about the back up brake feature that was mentioned but I'm guessing they're just standard electric brakes. I am going to open up the plug to see if one terminal is minus a wire. I'm also going to connect my truck to the camper, power everything up, connect my volt meter & see if this gray wire gets power to it. If not, I'm guessing it may be an extra ground, but I haven't pulled the seat up inside to look at the power box to see if it's running to it.


Keep those idea coming. I'll keep ya posted as to my findings.
Thanks again.
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Old 09-01-2016, 04:49 PM   #6
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A clear lens is indicative of backup lights should have a single filament bulb and have two sockets. Grounds are pretty much standard white wires as far as trailer wiring is concerned and Sunline white wires are grounds also. You didn't mention what you TV was if it is a 7 pin factory tow package it has a reverse signal that will light backup lights or disconnect surge brakes. Your camper does not have surge brakes they are electric (powered by a blue wire). Surge brakes are used on boat trailers because their brakes are often underwater.
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Old 09-19-2016, 07:46 PM   #7
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Are you sure it went to the plug? the split wire loom doesn't look original and i suspect the gray wire didn't go to the plug originally. The yellow wire in that harness should be the back up lights. Maybe it went to the Breakaway switch?
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Old 09-19-2016, 08:13 PM   #8
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Are you sure it went to the plug? the split wire loom doesn't look original and i suspect the gray wire didn't go to the plug originally. The yellow wire in that harness should be the back up lights. Maybe it went to the Breakaway switch?
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I think the only way to resolve this is to trace the gray wire and see exactly where it goes. If it is something added by a previous owner, there's really no way any of us can answer this remotely. It's an '85 so almost anything could have been added over the years.
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Old 09-20-2016, 07:11 AM   #9
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Pin 1 ground white pin 2 trailer brakes blue, pin 3 tail light brown, pin 4 12 volt battery charge red, pin 5 right turn and stop lights yellow, pin 6 right turn and stop green, pin 7 reverse signal what ever color you have left over no color specified. This is not carved in stone but it's a pretty common scheme. If your battery is connected touch the gray to the battery + and see if your reverse lights come on if you don't feel real brave put an inline fuse on the gray wire first. Alternatively you can remove the left tail light (junction point) assembly and see if there is a gray wire connected to the reverse light.
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Old 09-21-2016, 06:48 PM   #10
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OK, thanks.

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Pin 1 ground white pin 2 trailer brakes blue, pin 3 tail light brown, pin 4 12 volt battery charge red, pin 5 right turn and stop lights yellow, pin 6 right turn and stop green, pin 7 reverse signal what ever color you have left over no color specified. This is not carved in stone but it's a pretty common scheme. If your battery is connected touch the gray to the battery + and see if your reverse lights come on if you don't feel real brave put an inline fuse on the gray wire first. Alternatively you can remove the left tail light (junction point) assembly and see if there is a gray wire connected to the reverse light.
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Old 09-22-2016, 08:28 AM   #11
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From looking at your plug and counting the wires you have 7 wires coming out of the plug. To me that would eliminate the gray wire as having anything to do with lights etc.
I would trace it back and see where it goes in the trailer.
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Old 09-22-2016, 04:23 PM   #12
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Looks like it goes up thru the floor under the furnace/refrigerator area. Haven't found the other end yet.
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Old 09-22-2016, 07:05 PM   #13
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Dumb me I never looked at your picture I don't think it has any thing to do with your 7 pin it's to long and it looks like it should join to some thing further up the split loom. yank the wires out of the split loom they go back in easy and see what's in there.
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Old 09-22-2016, 07:17 PM   #14
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Dumb me I never looked at your picture I don't think it has any thing to do with your 7 pin it's to long and it looks like it should join to some thing further up the split loom. yank the wires out of the split loom they go back in easy and see what's in there.
He said he already traced it back under the trailer where it goes up into the area below the furnace/fridge.

I am wondering if it might be the 12vdc charge line between the fused links and the battery. Wouldn't be the first time that something important like that got disconnected and forgotten.
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