technomadia Posted November 7, 2009 Share Posted November 7, 2009 So we just picked up the new Tundra, and it looks beautiful next to our Orion. But... Testing out the trailer hookup, I noticed that we are having issues with our trailer lights now. The top mounted Oliver light is not coming on at all, and all the other lights on the trailer seem to be shorted together into one circuit. Using the left or right turn signal flashes all the lights on the trailer, including the running lights. And turning on the running lights lights up everything, so that even hitting the brakes makes no visible difference. It seems to be some sort of short. I also noticed that the trailer batteries are not getting charged via the tow vehicle now. I took the Tundra to a trailer supply place and had the 7-pin jack tested, and they say it is definitely not the truck. I did some multimeter testing of my own, and I tend to agree. I think it is just coincidental that it is happening now, and we may have actually gone a while without noticing our tow lights being weird. We certainly haven't done any night driving in a while. I have been trying to trace the problem, and using a continuity tester I noticed that almost all the pins on the cable going into the Oliver seem to be tied together... The LT, RT, electric brake, power, and ground lines all test out as being tied together. Only the running lights and back up lamp pins don't cause the tester to beep. I thought maybe the Bargman cable between the tow vehicle and the front of the Oliver might be the issue, but that tests out fine. The short / issue seems to be somewhere inside the trailer. Questions: 1) Has anyone seen anything like this before? 2) Any ideas what might be causing the problem? 3) Where should I look to trace the wires for all the trailer tow lights? 4) Why oh why isn't there a published schematic for our trailers? 5) It seems really odd that not just the lights, but the charge line and the brakes are showing as tied together. Urhm??? Help and wisdom appreciated, - Chris Link to comment Share on other sites More sharing options...
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