Skip to main content ↑ ↓
Topic: lighting mixed up if trailer on (Read 490 times) previous topic - next topic

lighting mixed up if trailer on

the disaster has occurred after trailer hitch installations.
with a golf everything was fine, but with a jetta not so much.
that is, when the trailer is on:

cartrailer
indicatorokok
brake lightokok+right numberplate lighting, right rear light
rear lightrear fog lightok+rear fog light
rear fog lightrear fog light (!)ok
reversing lightrear fog lightrear light, rear fog light, right number plate lighting

plus when i hit the brakes,
the rear fog light control light lights up.

the wiring in the trunk should be ok.
maybe something on the exchange indicator relay ?

edit:
  • control light while braking: rear window defroster -> rear fog light
  • brake light, trailer: ok+*

Re: lighting mixed up if trailer on

Reply #1 –
there is the fusebox with replacement flasher relay installed:


there is the corresponding page on the hitch installation manual:


what could just be wrong ?

Re: lighting mixed up if trailer on

Reply #2 –
regarding the trunk i followed those pages:



Re: lighting mixed up if trailer on

Reply #3 –
if i disconnect the cars cable to the rear fog light,
its control light does not light up anymore.

maybe there's something wrong with the socket ?

i've made pictures of it now:



Re: lighting mixed up if trailer on

Reply #4 –
finally some pictures of the light bub panels.

on the left:


on the bottom right of the picture above:
the cablelug is for the fog back light and out of the powerbar on the right.
whitebrown and brown on the bottom right are going to the body.

on the right:
 

Re: lighting mixed up if trailer on

Reply #5 –
i've made some progress and may even have solved the issue.

the right panel again:


the pin-assignment of the right powerbar should be:
rear light, reversing light, rear fog light, indicator, ground, brake light

since there was no latch for it, i have had tapped
the rear fog light pin out of the power bar and placed a lug on it.

what i recently did is connecting the latch out of it to the bottom right
the lug from there to the bottom left and the one from there to the power bar tapping.
it was a counter-clockwise swap of the three.

the left panel again:


the pin-assignment of the left powerbar should be:
rear light, reversing light, brake light, indicator, ground, rear fog light

edit: issue solved