Well I'm still spending a couple of hours a day tracing wiring and confirming circuits (complete car). I've learned a lot, the main thing being that these cars have 'dodgy' wiring circuits. It's amazing how many joins there are IN THE LOOM from new. Colours change within the loom and I've found one connection where 4 wires join of which 3 are different colours! The circuits appear to be over-complicated.
Anyway my original question is answered:
The relay plug I asked about should indeed connect to a passing/flasher relay. There are 2 - one is on the other side of the car for some reason (2 meters of wiring)! One relay feeds power to the headlights (even with the lighting switch in the off position - as you would expect) and one feeds the earth/ground to the main beam circuit. Both these should operate when the 'flasher' button is pressed. I only had one relay and the other was 'unplugged'. I'm assuming this was done when the wiring was installed after a bare metal respray and/or when the headlights were relayed.
Thanks for your input guys - Alan and Mike were correct but probably didn't realise that there are two 'passing' relays which 'threw' me.
I'll draw the circuit - I have it in rough.
Anyway my original question is answered:
The relay plug I asked about should indeed connect to a passing/flasher relay. There are 2 - one is on the other side of the car for some reason (2 meters of wiring)! One relay feeds power to the headlights (even with the lighting switch in the off position - as you would expect) and one feeds the earth/ground to the main beam circuit. Both these should operate when the 'flasher' button is pressed. I only had one relay and the other was 'unplugged'. I'm assuming this was done when the wiring was installed after a bare metal respray and/or when the headlights were relayed.
Thanks for your input guys - Alan and Mike were correct but probably didn't realise that there are two 'passing' relays which 'threw' me.
I'll draw the circuit - I have it in rough.