PeachParts Mercedes-Benz Forum - View Single Post - E300/W210: Battery drain

scott19_68 · #19 02-25-2008, 10:41 PM

No luck with the jumpering the ground. I did notice that with the battery connected and the engine off that the voltage between the B+ connector on the alternator and ground is not the same as the battery voltage. It starts out at the battery voltage (~12.5V) but it decays fairly rapidly (around 5 seconds) to about 10.6 volts. As far as I can tell from the wiring diagrams is that the positive terminal from the battery is connected directly to the starter and the alternator - any idea what might be happening? If someone else with a E300D can check the voltage (car not running) between ground and the B+ terminal on the alternator and report back that would help me out tremendously...