by loot » Wed Oct 03, 2018 1:28 pm
Grey /brown, that's according to my trailer module diagram.
Best way to find out though is usually to remove the cluster and follow the middle pin to where it goes into the connector. Has always been quite easy to do, otherwise unplug the connector, with a multi tester put black lead to the black cable you think is ground. and with only reverse gear and ignition you should only see power at the reverse pin.
Note that I think these are reverse polarity.
56 350 2.2 130ps mk7 with 2 side doors
65 290 2.2 125ps custom with 2 side doors
07 350 170ps
Ids v86 licence + v86.04 update + xprog
hereIds map
here