As title ,

Im wiring in a new Diesel heater plug relay into a friends car , i have robbed the relay out of a old sierra and have the following colours

Thick red ( presume permenent live from battery )
Thick red with yellow trace ( presume 12v out to plugs)
Brown obvoiusly earth
Black medium gauge where does this go ?
thin gauge brown with yellow trace, ??? Ignition switch or dash lite ?
Thin gauge black with green trace.?????Ignition switch or dash lite?

as you can see there are 6 wires , these i presume go to the following

12V perm live
12V to plugs
earth
Ignition switch
Dash board light

But whare does the 6th one go ???????

i think its the black one thats left as when its been cut off the donor car loom it has about 6 other black wires comming from it , as if its to supply a live to various other compunents ???


any help greatfully received


Muchos gracias amigos