Thanks guys I will check those out. On my previous battery which still seemed t be new, this was happening but I though it was time to change the battery and didnt mind it. At that time I still had my stock radio and such. Now that I put a new battery, couple of months old, same thing but have an after market unit.

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6