Hi, I am still struggling with my electrics. I have a 93 Sierra column stalks and have used a CBS module plus a relay for both dipped and high beam headlights, all lights work fine except for dipped. I have checked my wiring of the relays several times, tried different relays and checked continuity of wiring to the headlamps, even the bulbs (which are H4).

I have checked through past threads but can not find any information about this problem, its probably staring me in the face but I can't see it, very frustrating. anyone have any ideas?

Can you post a copy of the CBS wiring diagram plus whatever you have added.

Cheers
Davie

Hi Davie, Thanks for your reply I will post the wiring diagrams as soon as I work out how to do it, Pete

Sierra stalks? Mine are fubarred :-(

Hi Davie, Have found out how to post images, should be below, I hope. Thanks , Pete.






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Although I'm not familiar with the CBS module. Remove 56B connector from relay and test for continuity from this to earth with headlight switch set to dipped. No continuity means a fault somewhere on this circuit.

Thanks Smoking Frog, I checked that its OK, Pete

Are both main and dip both on at the same time? Remove 56A connector from the main beam relay and switch the dip on.

OK certainly what you've posted should be working.

Can you hear the relay switching?

Have you checked your wiring on the H4 bulb?, if the ground is on the wrong terminal only one filament will work.

Hi Smoking Frog, just tried that and yes the dipped lights came on. It looks like both dip and high beam are on at the same time, how do I fix that? Thanks , Pete.

Hi Davie, yes the ground is in the correct position as your drawing, the colours on my plug are different to yours having red for low beam and white for high but they are in the same position as yours. I can hear a relay switch but am not sure if they are both switching as my hearing is not the best. But I have swapped relays and the problem remains the same. Thanks , Pete.

Remove 56A connector from the main beam relay and switch the dip on. Now move switch to high beam position. Does dipped beam stay on? Should be off.

Similar test for main beam (replace 56A connector)
Remove 56B connector from the dip beam relay and switch the main beam on. Now move switch to dipped beam position. Does main beam stay on? Should be off.

Have checked relays as you describe, they both work as they should and I can hear them switching. I think I need to fine tune the description I gave of the problem. When head lights are turned on to dipped they light up but when turned to full beam there is an hardly perceptible flicker but the intensity of light looks the same. So it seems that rather than dipped beam is not working its more that high beam seems to on at all times, removing 56b from the dipped relay stops the light from working.

I have just connected an Acewell Digi Dash and the high beam tell tail lights up on dipped as well as full beam, it seems to me although I have no previous experience of car electrics that this is a Sierra stalks problem or the way I have wired it up, but the side lights, indicators and hazards all work as they should.

This is really doing my head in, thanks for bearing with me so far I hope with your help I can fix this, Pete.

If you relays are working as they should double check wiring to bulb as daviep suggested. Maybe even remove one and wire it up to a battery to confirm correct connections.

As I said before, I have some big problems with my Sierra stalks. It sounds as thought the main/dip relays are working, but it's just an intermittent thing, so they work as the stalk moves forward (or back), but only momentarily. Similar problems with the indicators.

Hi Mash , I think you are right about the Sierra stalks, I have checked the wiring several times it all seems to be as it should. I have even looked at the headlight bulbs with a welding lens and both filaments are on at all times ie full and low beam. Can you recommend and alternative set of stalks? Pete.