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had the same problem, solutions here. S70 1999

Get the voltage checked on your battery.
Your trunk light might be staying on when it is closed, have it disconnected.
It could slowly be killing you battery.

Have your delaership check and most likely replace your alternator and battery under warranty if it still has it.


In the first 1 1/2 of my car i went through 3 batteries i think and finally they disconnected the trunk light and replaced the alternator and everything worked fine.

Next problem was dimming from the amp.
I also have 2 12"s and a large amp around 800. Got a 1 farad cap and it helped. The caps make sure your amp's power does not drop below 12.6 volts. Get a 1/2 farad for smaller ones.






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