Trailer light harness, splice under van or at taillight

I’ll be wiring my trailer lights powered module.

On my many E320 wagons, I always spliced at the tail light......

Thinking of doing the same on my 2003 passenger.

I’ve read somewhere here that indicated the color code for the wires..... can’t seem to find it again.

Can anyone point me in the righteous direction ?

Thanks,

John

Cavah said:

...

Can anyone point me in the righteous direction ?

Thanks,

John

Click to expand...

Glad to help.

https://www.youtube.com/watch?v=uOnYY9Mw2Fg

For my 2004 I took the time and effort to install the trailer light wiring and module into the driver side rear tail light assembly area. For the 2006 I wised up and just mounted the completely weatherproof powered trailer light module under the van near the spare tire. The 2006 install went much more smoothly. For one thing the opposite side turn signal wire didn't need to be brought over to side where the module is installed/wired. When the module is installed underneath all the wires needed were right there in the area of the spare tire. I would do the 2006 method again.

Some detail is here including wire colors/function.

https://sprinter-source.com/forum/showthread.php?p=581988#post581988

vic

I did my wiring inside the van, splicing into the taillight wiring by the harnesses and mounted my controller on the rear pillar.

In the MB instructions for retro-fitting a trailer module to a T1N, they only do one splice, but they do do it in the pillar, near the tail light unit connector.

It's shown in this file: http://www.diysprinter.co.uk/reference/T1N-trailer_wire_harness.pdf
in figs 17 thru 19. They're only showing the Black/White wire being spliced, which is the left turn signal.

--dick