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My question is this, Is this a product of the age of the car? Or is this a likely sign of an alternator that is overcharging or undercharging? Or did the previous owner run into an electric fence?
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My answer is this, Yes. No. No.
Dash lights shake out like there is no tomorrow. The failed ones do not look burnt - there is a break in filament, but the glass surface is not black or shiny. So it looks like they simply do not like being in a car. This applies to button lights and panel backlights.
Roof light went bad on every Subaru I owned. On my SVX I've changed it twice already. I keep a spare one in my toolkit.
With those it is a soldering problem - a wire from the bulb itself breaks loose from the metal cup. You can temporarily fix the light by simply touching it and turning it in the socket, but it will stop working again soon.
Reverse lights are very seldomly on, they are probably OK - you may discover you have a bad ground or reverse switch on the
tranny does not work.