T25 Rear lights wiring help

[BrownVanDriver]

Recently had my rear lights stolen on m '86 t25, am in the process of replacing them but am struggling with the wiring.

Each side has 7 wires, the bulb cluster has 6 connectors, I have found info of how to wire the 6 to the cluster but am lost with the blue spare wire on each side, am guessing it's to connect to the chassis but cannot see where it connects

I've seen mention of an earthing point to the left of the engine bay but cannot see it.

I've asked my regular garage but they won't touch it as I've already sourced the parts. I'd be grateful of any help or suggestions

[Mocki]

A couple of years ago Robsey posted this , referring to the connector in the black box , it may help

Lighting connector is as follows.
T7/1 = Black / White for left indicator
T7/2 = Black / Green for right indicator
T7/3 = Black / Red for both brake lights
T7/4 = Grey / White for the rear fog light
T7/5 = Grey / Black for left tail light
T7/6 = Grey / Red for right tail light
T7/7 = Brown for chassis / earth for both rear clusters.

Note that the reverse lights and rear number plate lights do not go from the seven pin plug.
These are separate wires as follows.

Reverse light wires are Blue / Black, to reverse switch and then to rear light cluster(s).
And rear number plate wires are Grey / Green.

[bigladwigan]

Hi, did you manage to find pigtails with the connector or did you rewire the connector yourself? I need to replace the wiring for my rear lights due to issues as a result of fitting a trailer connector.

Cheers

Ady