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Towbar wiring
Single socket - trailer lighting
Published by sludgeguts
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Towbar wiring

If you want to include the fog light & only run 2 core cable, it is best to bring the trailer cable into the OSR (driver's side)(there is a handy drain hole where two bits of bodywork join) .
I brought mine into the NSR (passenger) & so had to run the three core cable.
For those who are interested (& to save anyone else from pulling the light cluster & possibly losing the silly nut thingy), the wiring colours are...

In order on the plug.

Offside (driver)
Grey (or a strange purple - it was hard to tell) - Fog
Green/Yellow - Brake
Pink - Indicator
White - Reverse
Yellow/Red - Tail
Black - Earth

Nearside (passenger)
Unused Pin (for fog if wired)
Green/White - Brake
Green/Red - Indicator
White - Reverse
Yellow/Black - Tail
Black - Earth

I ran my wire up and over, through the plastic headlining above the tailgate.
All the wires were scotched in with no ill effects to the system. I took a 12v supply for the relay from the power socket by the gearstick. Again, scotched a wire to the supply for this, running under the centre console, under the carpet & through to the back behind the panel.
A good diagram for wiring the socket can be found at
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Old 16-07-2019   #1
Join Date: Mar 2018
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Cmacey2010 has donated!
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Re: Towbar wiring


I am after a diagram for the wiring system in my 2008 doblo cargo. Found loads of diagrams for the fuses but no info on the relays. Having issues with my reverse light. Your link doesn’t work any more, can you help?

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