Low-Beams not working 73 2002

[2002Squaretail]

You are going to see more than one apologies from me for not using German. It's bad enough that it's better that I write you in english So I apologize! But I do need your help.

I have only one thing that is keeping me from getting my TUV approval and H-registration of my vehicle right now that I can't seem to fix, and that is my low-beams for the headlights.

All other lighting is currently working just fine, High-beams, parking lights, signals, etc. But my low-beams are not.

So far I have replaced the dimmer-switch with a switch i know works, and that does not fix it. I cannot find what could be a relay for the low-beams. below is a view of the fender where all the relays are.



I'm still not sure what (A) and (B) relays/boxes are...

I do not have a volt-meter, but I looked at the connection at the Ignition, and it seems fine/tight.

The turn-signal/high beam switch looks to be clean and ok too.

I cleaned/replaced all the fuses in the fuse box and cleaned the clips for the fuses, no fix.

I did, however, remove the fuse-box to make sure there weren't any loose wires running to the back of the box, and I can see the Yellow with black stripe, and Yellow with Green Stripe wires that go to the headlights, but there are no wires running out from what I assume is the ground side of the Fuse... Does that make sense>>

See below image, there are two empty sockets where the headlight fuses are for the low-beams. Should it be like this>



I really appreciate the help! I want to get my 02 on the road soon!

[2002Squaretail]

Are there any electrical grounds that I should also look at that could be the reason they are not working>

[Wolfgang]

Let's see....

Seems your car is from 7/73 on - square taillights, turn signal switch left (since earlier 02 do have different wirings).

The relay A does not look original, no idea what was intended whith it. B seems to have the same plug as C and should be for the generator (the larger for the battery charging, the smaller probably to dejam signals).

Do not worry about empty sockets, all connectors are made for two wires but low beam just has one wire plugged in.

The switching between low and high beam is somewhat tricky. This is in order to avoid both glow filaments in the light bulb being burning (which means too much heat and kills the bulbs).

The high beam relay switches only if the low beam line carries ground. It carries ground trough the glow filaments of the low beam which are connected to ground. If that ground fails, also the high beam won't work, so that should be OK.

High beam is fuse 11 (white-violet wire).
Low beam is fuse 9 (left, yellow-black) and 10 (right, yellow-blue). As long as low beam ist switched off, there should be ground (through the filaments), a test lamp should glow connected to battery plus, not as bright as against ground. OK>
If the light switch (with the dim) ist turned on, there should be plus at fuse 9 and 10, test lamp should glow bright against ground. OK>

Sometimes, the low-high-beam switch (which includes turn signal switch) fails. You can try to little pull on that lever, maybe then the low-high switches to low. That may be the most likely problem. If you fully pull, you have headlamp flasher - inside ist a small piece that wears over time and then you only have high beam.

Check this and let us know.

Good luck
Wolfgang