Hi,

I have a 1980 4 cylinder 240d
I am wiring a bypass to the original glow plug relay and adding a interior cabin button switch and solenoid.
In the large wiring harness that goes into the original glow plug relay, I have 6 wires:
Black with blue stripe
Brown with green stripe
solid green
black with a purple stripe
black with yellow stripe
black with a red stripe

I understand that 4 are for the glow plugs but what do the other wires go to?

Would I wire all 6 wires to the other end of the solenoid, opposite the 12 volts.

Thanks.