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When I put on the full headlights they both work but when I put on just the dips only the passenger works, Ive done the following work to find out the problem but problem still there? I replaced the 2nd from left, where is the other one found?I changed the one in the front spare wheel compartment, in the 4 x relay holder,
? I think that's that's the rad fan relay. There's two different things you have to think about dim/dip is not the same thing as dipping the main beams. ie you have a twin filament headlight bulb one filament is main beam and the other is dip beam. (on a 1b) dim/dip (this was added to comply with the Euro legislation that was in force at the time) what the dim/dip does is put both your dim beams in series (effectively halving the output) which makes them come on dim but only with the light switch in the sidelight position (first click). Once on the second position the dim/dip relays are de-enefgised. There is no main/dip relay on a MK1, that switching is done by the stalk on the steering column. If one headlight is working on dip and the other isn't then it's either the bulb, bulb holder, wiring or possibly the dim/dip relays. IIRC the relays are are located in the boot below the liner (passengers side) they normally have rubber covers on them.'89 4agze (usdm version). It is on my passenger side as well, but your driver's side. I had probably been driving around for awhile with just one headlight, and just hadn't realized one of them was out until someone mentioned it to me. I also have checked various possible issues with no luck, after first replacing the headlight. It's a rather unusual problem for me, as I have owned 3 MKI's and have rarely had any electrical issues of any kind with them. The BGB electrical diagram hasn't been a big help with diagnosing the problem either. That or I am unable to read it properly, lol. So far I have had to drive around with my brights on all the time, but with the headlamps severely adjusted to keep from blinding other drivers.? If so try this, with the meter set to DC volts(supply)(high)(low)(supply)(high)(low)(low beam), put one lead of the meter to a good ground (body) connection (preferably a clean bolt in the front boot). (just moved). I think I checked all of those awhile back, but can't recall the exact results. I'll try checking mine again tomorrow, and then post the results.'89 AW11, and I now remember what has always bothered me: the separate wires for each headlight's low/high beam filaments both join together before connecting to anything afterwards, thus making it seem that there has to be some sort of weird short, not relay or switch related, that is causing the issue, otherwise both low beams would be affected. I just can't imagine how that could have just happened on its own though. a temporary wire to the red/green wire on the back of the non working headlight and touch it to a good ground (with the lights on and the faulty beam selected) if the headlight comes on then it's a wiring fault.