On the 1991-93 190e 2.3's there is an intake manifold heater that requires about 25-30 Amps of power. Designed only to come on when the engine is cold. IF the relay sticks then this draw will kill the battery & alternator. Have someone remove the relay & see if the problem goes away.
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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
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