electrical problams - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 02-10-2007, 12:40 AM Thread Starter
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electrical problams

I have a 1971 220d I bought a brand new battery and brand new alternator and it still wont keep a charge what would i be looking for to fix this problam
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post #2 of 4 (permalink) Old 02-10-2007, 02:12 AM
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You will have to look for a steady current drain when the car is off.

1. Disconnect the batttery negative cable and measure the total current. This is done by using an ampmeter, in a DVM or VOM.

2. Reconnect the battery.

3. Pull each fuse and measure the current drain. Compare this with the total current drain you measured at the battery.

4. When you find the fuse with the most current, or total current, drain, look at the devices on that circuit.

5. Isolate the loads on that circuit.

You may find that the trunk light is on when the trunk is closed or a new radio is wired improperly or an additional amplifier is wired to be on all the time.

Additionally, if you did add a high power amp, the current draw is more than the alternator can handle and the battery is supplying the current to run it, along with the alternator, and the battery is not being charged.

Make sure the battery clamps are clean.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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post #3 of 4 (permalink) Old 02-10-2007, 07:53 PM Thread Starter
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the car does not have a radio in it and it dont drain untill i drive the car i was told that the voltage regulator might be bad, i am new to these cars and dont know where it is and i cant find one in the local parts store. does any one have a pic where it is and what it looks like.
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post #4 of 4 (permalink) Old 02-10-2007, 08:41 PM
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