8 replies to this topic

[System]

Strange thing today I have no dash back lights.

All fuses are ok, tail lights are ok, switch functions, headlights and sidelights are ok. I've tried known working bulbs and still nothing.

I'm at a loss as I've run through all the usual suspects even cleaned the cluster plug connection. The PCB is new (mini spares) and it's a 3 clock if it helps

Model 93 sprite carb.

[slidehammer]

I had a similar problem and it was poor contacts between the bulb holders and the circuit board. You could try gently cleaning the copper on the circuit board contacts and the holders themselves. As a temporary solution you could pack them out with some silver foil and see if that helps. In the end I changed the circuit board for a new Mini Spares one. I think the copper contacts oxides over time. Also clean the contacts on the multi plug.

[RedRuby]

Have you checked the in- line fuses behind the carb in the engine bay, if I remember correctly one of them controls dash illumination.


Just checked it's a 15 amp fuse on a red/white wire but it also controls the rh tail and stop lights as well as instrument Pack illumination so unlikely to be that as you say yours are ok

Edited by RedRuby, 18 April 2017 - 07:14 PM.

[System]

I had a similar problem and it was poor contacts between the bulb holders and the circuit board. You could try gently cleaning the copper on the circuit board contacts and the holders themselves. As a temporary solution you could pack them out with some silver foil and see if that helps. In the end I changed the circuit board for a new Mini Spares one. I think the copper contacts oxides over time. Also clean the contacts on the multi plug.

  

The PCB is a new one from mini spares, I have cleaned the Contacts already.

Have you checked the in- line fuses behind the carb in the engine bay, if I remember correctly one of them controls dash illumination.
Just checked it's a 15 amp fuse on a red/white wire but it also controls the rh tail and stop lights as well as instrument Pack illumination so unlikely to be that as you say yours are ok

Tail lights illuminate I checked the fuse block and the fuse is ok.

The dash back lighting was working Sunday.

Edited by System, 18 April 2017 - 07:42 PM.

[malynch27]

Have the bulbs blown? All at once?  If not, with the clocks and a volt meter to hand, you could check the voltage across the bulb terminals and work your way back from there to see where the issue is.

[System]

I tried known working bulbs in and nothing...

[slidehammer]

What about testing the multi plug with a test lamp or meter, to make sure there is power to the circuit board. I still think it will a bad contact around the board either the multi plug or at the holders.

[System]

What about testing the multi plug with a test lamp or meter, to make sure there is power to the circuit board. I still think it will a bad contact around the board either the multi plug or at the holders.

 

I had that thought earlier. I'm going to make sure there is power to the plug. I have some auxiliary switches and stereo on the same circuit and they illuminate. I'm starting to think a loose plug pin or even though the PCB is about a month old that the "live" on the PCB is the track that has the wire bridge over the tracks. if that has gone it may give me an issue. I don't think there is a blown fuse as the sidelights and tail lights work if the fuse was blown both would be out and also my aux switches and stereo.

[System]

Solved: the month old PCB from mini spares had somehow developed a tear. It went straight through the track right by the multiplug. Bit dissapointing

Edited by System, 19 April 2017 - 05:31 PM.