I would start with the fuse if you have your car manual it locates where the fuses are located and what size you need you might have one for the amp and the other for the radio or cd player before going to far with all this check fuses all if have to one by one
SOURCE: 2006 E350 4matic wagon losing electrical power
check battery make sure its cable is tight. charge battery or jump start it .once you get it running check alternator out put.it should be 13.5 to 14.5. while engine is running.if its 11.8 to 11.0 or lower its the alternator. if all is good. your battery has a bad cell.need to replace it.
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