Having problems with your Volvo 960 ?

The lights on the instrument panels as well as the radio flash at intermittent intervals. There seems to be no rhyme or reason as to when this happens (i.e. hot or cold car, bumps or no bumps, turns or no turns). Please advise.

Posted / edited by AnonymousUser on : 10-12-2018

Answers :

I had intermittent instrument light problem that went dark for months,\015\012until today. :o) I read somewhere that it could be the dimmer switch\015\012and didn't think that was my problem as the dimmer worked (dimmed the\015\012radio and transmission indicator light) and playing with it never\015\012seemed to help with the problem. I did find it odd that dimmer was not\015\012completely linear, as it would get brighter up to a certain point and\015\012get slightly dimmer with the last little bit of travel.
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\015\012Today, I took the instrument cluster apart to fix a broken clock,\015\012sticking gas & voltage gauges, and to explore the instrument light\015\012problem. I took apart the dimmer switch, and to my surprise (was\015\012expecting a simple POT), it was a very complicated PCB with some IC's,\015\012resistors, transistors, etc. I thought, "all this just to dim the\015\012light???" Anyway, I found the POT (potentiometer) and gave a few\015\012squirts of WD-40 and found it turning smoother. After putting it back\015\012together, the instrument light came back and the dimmer is now\015\012perfectly linear. Apparently, less than perfect POT causes some sort\015\012of funny logic through the network of IC's and transistors and can\015\012cause the instrument light to go on or off randomly at certain\015\012intervals.
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\015\012Anyway, I'm so happy to have the light back along with a working clock\015\012and not having to punch the instrument cluster to see how much fuel I\015\012have. Not really a posting type, but wanted to help someone else out\015\012there with a similar problem with same cause.
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\015\0121989 740 Turbo
The fuse contacts/fuse box just may need cleaning. Usually the fuse for the dash instruments is the same one that controls the seat belt light,heated rear window and the electrically operated sunroof switch. The radio uses a different fuse.
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\015\012It sounds very much like a 'sticky' electrical contact somewhere. Try operating the dashboard lights dimmer switch as well ... that's the slider switch on the dashboard that dims/brightens the dash instrument lights.
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