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#1
02-11-2010, 01:27 AM
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electrical drain...maybe
guys/girls,
if i have a pushbutton switch on my ccu depressed could it cause a drain on the battery...ie the defrost pb/the rear defrost switch/etc circa 1987 420sel.... something is causing a drain on my battery....and im not sure what it is as of yet...please help with any suggestions/answers. lyle in marfa, tx 
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#2
02-11-2010, 02:09 AM
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DMM (Multimeter) and patience
Start pulling fuses and testing each circuit with the DMM.
Then look at all the unfused users. My Favorite on older cars is a bad diode in the Rectifier of the Alternator, it sneakily drains power whilst the vehicle is sitting.
__________________
'84 300SD sold 124.128
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#3
02-11-2010, 08:17 AM
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The a/c pushbutton does NOT get power with the key off. Therefore no draw.
Most likely on that cat is the electric antenna.
__________________
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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