Originally Posted by Strange Mud
you didn't mention it but drivers voltage goes to 0?
it'll be ugly but swap assemblies (leave them hanging) to see if it's the unit or something else. You also may have a problem with the connector which is not bad to replace. High voltage drop across it can cause heat issues. what happens with just parking lights? High/Low beam? You said one new bulb....have you swapped bulbs with the other side?
no matter what I'd like to know this is interesting...
Ok so yes the voltage goes to zero when the headlight bulb goes out.
Only swapped out the bulb on the affected side.
Unable to find a time delay relay in the Haynes diagram P 12-34
The high beam works fine engine off or on. Course driving around on the high beams is gonna annoy some folks.
I've been looking at the headlight wiring diagram in the Haynes Manual and I see relays for high beams and another for the fog lights, but not for the low beams. The headlight switch routes to the "Smart Junction Box", then from there to the multifunction switch (high/low beam selector) then to then back to the SMJ and out to the headlamps. From the headlamps to the bussed electrical center, after that the two wiring paths rejoin to ground.
So the current is supplied separately from the SMJ to each headlamp, through the lamps, to the Bussed Electrical center, then recombine after prior to ground.
So, does anybody know where the not so Smart Junction Box might be located? I want to see if the outbound white wire is still hot when it exits the SMJ.