Need Help.. very badly... huge electrical problem - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 08-25-2007, 09:15 PM Thread Starter
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Need Help.. very badly... huge electrical problem

I have not driven my 89 300 se for about 4 years. I went to start it and have no power anywhere. I put in a new battery and it has charge.. but there is no power anywhere in the car. Is there a main relay or fusable link that could be damaged? I have no idea where to begin looking... and by no power i mean nothing.. no interior lights.. no door chime.. nothing.. even if i hook up a charger.. no headlights.

What could it be?

If you could email suggestions to :
I would appreciate it.. i am new to this forum and am trying to get used to this format.

All the best!

and yes.. im in the yukon.. so don't say "take it to the dealer "
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post #2 of 5 (permalink) Old 08-25-2007, 10:09 PM
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Welcome to the forum. There is no such thing as fusible link on the main power supply. Get a tester light and check all the connections. Very likely battery clamps have some corrosion on them, or cable connector is dirty. Just because it looks clean from outside, doesn't mean it is making electrical connection.
Good luck.
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post #3 of 5 (permalink) Old 08-25-2007, 11:21 PM
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If it really is no power, it should be easy to diagnose by measuring the battery voltage from the battery terminal directly (not from the wire clamp). Then forwards like towards the fuse boxes.

Modern MBs actually have a fuse on the main battery wire. It may not be even well documented (not in the car manual for sure) and may not be easy to find. It is a pyro-fuse, one that is blown off like in an accident to protect the car from short circuits that could ignite a fire.

If the battery connectors are bad, you should be careful with a charger, should use a good one. Perhaps your charger was not able to supply enough current without support from the battery (assuming the pyro-fuse hasn't blown, or does not exist on your car).
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post #4 of 5 (permalink) Old 08-26-2007, 02:49 AM
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When you installed the new battery , did you clean the battery terminals and inside the cable terminals with some emery cloth? then go check the earth cable has a clean mount also.

I got caught once with a new battery with heavy oxidation on the terminals , it was quite hard to clean off. It looked ok at first because it was so uniform in color.

'76 - 300D
'72 - 240D (noddy)
'40 Chev pickup
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post #5 of 5 (permalink) Old 08-26-2007, 09:20 AM
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The forum you need is the w126 forum.

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