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Old 04-07-2014, 12:51 PM   #1
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Backup lights not working

Background first:
When I bought my 76 tradewind I had exterior light issues from the start. the sellers mentioned the first owner was a mechanic and did all kinds of wiring additions and 'improvements' (i use that word lightly) and they had to have their TV rewired to match the AS. (Uh oh) Lets just say i towed it home without the lights working properly. :/

Here's my current issue. I had to go in and rewire the main box so the lights matched the original AS diagram. It shows the 12v main charge line is supposed to be in the center pin. However, from what i understand, modern 7pin connections on my TV have an auxillary or reverse lights at the center pin not the charge line. So I switched the 12v line and the reverse lights on the AS panel to match up with the TV. Everything works on my AS now when plugged into my truck EXCEPT my backup lights. And I know they are functional because I tested them seperately with a remote battery on the circuit breaker panel. I am not sure what I am missing. I am good at following diagrams and instructions when it comes to electrical stuff, but im not so good with the problem solving concepts. Anyone have any ideas?

Thanks in advance!
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Old 04-07-2014, 01:05 PM   #2
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I thought the center pin was always either brakes or battery charge- only 2 options, but I see some diagrams online that have the center pin (purple wire) wired for reverse lights.
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Old 04-07-2014, 01:06 PM   #3
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Maybe the 2 center pin options are battery charge or reverse lights.
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Old 04-07-2014, 01:12 PM   #4
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Quote:
Originally Posted by merrypaws View Post
When I bought my 76 tradewind I had exterior light issues from the start. the sellers mentioned the first owner was a mechanic and did all kinds of wiring additions and 'improvements' (i use that word lightly) and they had to have their TV rewired to match the AS. (Uh oh)
Which is the best indication of all that the second owner didn't know what they were doing any more than did the first owner. Did they not even realize that they could have just rewired the umbilical cable to match the standard seven-pin socket at one end, and the trailer at the other?

But to address your current issue, I can see two potential problems:
1 - There is a problem in the umbilical cable. Continuity testing from one end of the cable to the other can determine if a signal coming in one end is coming out the other.
2 - There is a problem in your tow vehicle's seven-pin connector. With the vehicle in reverse, is there power to the pin that carries the backup light signal?
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Old 04-07-2014, 01:35 PM   #5
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Most likely the tow vehicle is wired correctly, especially if it was wired at the factory. From the factory the trailer was wired correctly.
Change the umbilical to match the tow vehicle. Wiring diagrams are easy enough to find online.
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Old 04-07-2014, 08:35 PM   #6
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About the umbilical cable, I checked that and the wiring was all screwy too. I have no idea what this guy was doing. Wait until I post about the interior.

So I fixed the cable too. It's a Pollak cable and I had the diagram for that and the color code was also stamped on the rubber housing and sure enough they were all switched up.

I guess I will go and check cable continuity again. I think I checked it before I switched the cable wiring but not after.

And I will certainly check my truck socket. It's a 2005 silverado with GM factory installed hitch/socket so I hope nothing is wrong.

Thanks, I will check into those options.
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Old 04-08-2014, 06:37 PM   #7
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I believe it is your umbilical and the center pin will be reverse lights.
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Old 04-11-2014, 12:00 AM   #8
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I traced the issue to my TV. New problem, new post...
http://www.airforums.com/forums/f238...ml#post1440802
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Old 04-11-2014, 06:46 PM   #9
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Our similar problem was just a missing relay in the tow vehicle.
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