Well there is a dimmer switch on the dash that might have a bad contact thus causing the connection to be bad... like bump will make them flicker or there..... wait the ac/heater controll or the speed on and tack???
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Lights? more than one? It is extremely improbable that many lights burned at the same time. Jiggle the dashboard dimmer wheel (used for light attenuation adjustment) to see if the lights come back to life. Dimmers, being rheostats, have the nasty habit of burning spots, so they work only at a different location than the burnt spot. Many burnt dashboard lights might be an indication that they got too much voltage. ( Bad voltage regulator). Dashboard lights are placed in the rear of the assembly, and screw right into it. Dashboard must be taken out, and it isnt simple. Purchase a full set of dashboard lights at the car dealer before taking down the dashboard, because you dont want to find out that you dont have the proper bulbs, and the whole dashboard already disassembled.
I am not sure about the 1992 since they have newer dashboard than my 86.
Anyway, I got that same intermittent issue on mine, sometime the battery was drawn in the morning sometime not, very frustrating, until i noticed that the interior light sometime was not going out as it should after 30 seconds when leaving the car in the evening.
I eventually found the timer module after removing the upper dash pad, on the passenger side. The module was just partially unplugged. Put it back in and never got problem anymore (was 6 years ago).
First, make sure it's not that your dimmer switch has been turned all the way down.
Check fuse 22 and 23. If they're good then you may have a bad ground somewhere. Check the board and fuse box under the battery (yes, I know - but thats where vw located it) for corrosion.
DASH LIGHTS ON 850 VOLVOS SOMETIMES THEY DONT MAKE A GOOD CONTCACT I REPLACED MY ISTRUMENT CLUSTER AND HAD TO TKE IT OUT 4 TIMES AND PUT ELECTRICAL GREASE ON BULBS AND CHECK THE DIMMER SWITCH IS ALL THE WAY TO THE RIGHT OR THE HEADLIGHT SWITCH PLUG