What kind of a stereo do you have? Is it stock?

Often poorly installed after market stereos with external amps are wired always on. Even in the standby state the amps deplete a battery in days.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)