New to me car, 1991 mercedes 300te
I have the car 20min starts, drives, no problems. Park it.... 8 hrs later D E A D. I jump it, and it fights, but starts up. drive it one hour home, runs fine, just before i turn her off I try the electronic seat adjustment and the headlights dim off and the radio goes out as i touch the switch. i try the window button, i pull up on it as the window is already up, the lights go off again, interior stuff as well. So it seems the alternator right?
i park over night, today it is dead again, so i replace the battery with a new one. put the positive terminal to the battery, and the negative to a test light then to the battery, it glows like a becon. i pull all fuses one at a time and the test light does not go out.
so what could it be?
i get 12.6 volts with the key in my hand. once started i get 13.5v so it seems the alternator is good. there is also an aftermarket kenwood installed, mabey it could have sucked the old battery dead.
If this thread is already posted again and again, i just need to be pointed in the right direction.
please help me