bradley6,

Also after the engine IS running, try disconnecting the MAIN wiring connector from the glow relay, and then see if the alternator is actually working.
Many times the glow relay sticks ON & that will take all of the available power from system.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator