Hi Guys,
hoping someone can help me troubleshoot some problems with my towbar wiring... Went to tow something with the lux for the first time today, plugged in the boat trailer connector and go no lights, turn signals or anything...
So i've pulled the plug apart and tested the wires with a multi meter, I get a constant 12V out of the brown wire, and
nothing out of any of the others (other than white being earth)
I then traced the wiring up to a little black box that was sitting in the LH chassis rail which had 2 wiring plugs in it, some of which have the same colour wires, so i'm assuming this is some type of relay box for the trailer wiring...? anyway I disconnected the plugs and tested the terminals and got a voltage reading on all connectors on the battery side plug, and then tested for continuity on the trailer side and all wires seem fine...
The two wiring plugs
Black Box, PN L1872
so the problem appeared to be in the black box, I opened it up and checked the circuit and found below;
Looks to me as if the top left corner is the buggered part?
So should this be a simple case of getting a replacement part from toyota? or something else I will need to get?
Also every trailer pin wiring diagram I can find for a 7 pin connector mentions a black wire...which I don't appear to have! is this normal or am I missing something? Only got Brown, White, Yellow, Green, Red
Thanks for your help!