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Check your fuses first, park lights, I think. Pull the light switch to first click and check if your front park lights are on. If no lights are on, the headlight switch is probably bad. If the fronts work, but no tail lights or dash lights, the problem is probably a wiring problem under the dash. The same wire to the rear tail lights is usually with a splice to the dash illumination lights.
Yes it could be a fuse. If you have not noticed, I bet your tail lights are not working either. On most vehicles as a safety device, the tail lights and dash lights are on the same circuit. So it could be a simple problem with the tail lights, such as both bulbs are out. The 1988 is getting a little old but still a good car. They started putting tail lights on the dash circuit way back before the 1950's. Good luck. Let me know if that does not help.
Look at the socket? Are there two contacts? If so, 7528 (or 1157, same thing) is correct (and that's what the parts catalog will show). However, in the case of my 1991 740, there is only one contact in each socket. If that is the case use an 1156 bulb.
I spoke with an expert Volvo mechanic and he told be Volvo used two different tailight assemblies, a Hella and another one I can't recall by name. He said there appears to be no rhyme or reason as to what car has what, and this is the reason for the discrepancy in the proper bulb. The only way to know for sure what you have is a visual inspection on the unit.
Its one of the park lights, usually the tail light is the one that goes out. There are two tail lights on each side, it usually the top one (lowest light in the upper part of the tail light assembly)
Could you take out a bulb and with a testlight/probe check that you do in fact have power to that circuit .Also check that they are the correct bulb for that application I have seen people put indicator bulbs in where therse supposed to be a double filament bulb.Does the base of the bulbs lead contacts line up with the two steel terminals inside the plug?
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