I don't know if anybody can help me with my problem.
I just changed the heater rad as it had been leaking but when I took it for a test ride, although the heater was fine, I noticed my main beam was not working. I had spare relays which I swapped and made no difference but as they were old ones, I checked the solder connections and they looked fine.
I've just checked all around the blower uint to see if there were any connectors I'd broken or disturbed and then I got my meter out.
The checking at the dip switch, it appears to work.
Looking at what wiring diagrams I can find, it seems that the high beam is activated by an earth condition being extended by the dip switch to the S tag on the red headlamp relay. I am measuring for this earth and it does arrive but only about 3-4 volts-worth.
Does anyone know if this is enough? Or if there is anywhere in-between that I can break in to check?
I don't want to buy more relays that I suspect will make no difference but I'm also reluctant to go hacking into the wiring loom though I fear that is where I'm heading.
When the relays gave trouble before they were intermittent but this fault is "permanent" for want of a better word and the car is a 1997 2.0 CSE Auto anniversary.