Tow Bar Wiring

[si macc]

I have bought a lightboard to fit on my t3 and have plugged the cable into the socket. The only problem is that some of the lights don't work, or in the case of the brakes all of them come on! I didn't fit the tow bar and know very little about the van electrics. The bulbs all work fine, one indicator is ok, the lights that come on with the headlights are fine, the problems are one indicator and the break lights.

Does any one have any idea on where I can being to look to solve the issue? I have located the relay that does the indicator, but am unable to find where the cables from the tow bar socket are.

Many Thanks in advance!

[kevtherev]

You really need to discover where the tow bar electrics are attached to the vans loom.

most popular location is the junction box on the engine bay bulkhead

[si macc]

Hi Kev,

Thanks for your reply. Does the wiring 'piggy back' onto the wires going to the rear lights? I will have a look in the engine bay tomorrow.

Thanks,

Si

[kevtherev]

Hi Kev,

Thanks for your reply. Does the wiring 'piggy back' onto the wires going to the rear lights? I will have a look in the engine bay tomorrow.

Thanks,

Si

yes it piggies the existing loom

the junction box contains all the rear light wiring.
If you cannot see where the PO wired in the electrics, then you could do a proper job and wire in the board there with a new tow bar plug.

[si macc]

Nice, that should be all I need. Thanks very much for your help

[windysurfer]

Handy guide to wire colours on BY

http://www.brick-yard.co.uk/VehicleSpec ... towbar.htm

[campervanman]

Check the contact on all of the pins in the plug and socket.
This can cause problems similar to a bad earth connection.

[si macc]

Handy guide to wire colours on BY

http://www.brick-yard.co.uk/VehicleSpec ... towbar.htm

Brilliant I've been looking all over the net for something like than, obviously wasn't looking hard enough..... thanks!

[VWCamperfan]

Judging by what you have described, I woud first check the white lead has a good earth connection. Spray a little wd40 onto the plug and socket to clean connections too.

[wigg1]

The 12N socket.
The socket is coloured black and houses 7 pins which are are numbered 1 to 7 and need to be connected using the correct grade wiring as follows (1998 Pin Allocation).:


Pin Cable Colour Function
1. Yellow Left turn signal
2. Blue Fog light's
3. White Earth
4. Green Right turn signal
5. Brown Right hand side light
6. Red Brake lights
7. Black Left hand side light

hope this helps regards wiggy