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Car Forum / Mercedes-Benz Cars / February 2006voltage problems
Hi all, I've some voltage problems in 22-years old W123 200d. My lamps shine extra bright, now and then. I searched for a reason and connected a voltage meter inside. When the lamps shine extra bright, the voltage is about 19 Volts. It's only for about 30 seconds. Then Voltages decreases to normal level of about 14 Volts. What's the cause of this problem ? Damage to dynamo or voltage controller or ... ??? Who can help me ? Titus The alternator has diodes that regulate its power output. Your car's seem to be failing. Sometimes these diodes can be replaced separately, rather than replacing the alternator. >The alternator has diodes that regulate its power output. Your car's >seem to be failing. >Sometimes these diodes can be replaced separately, rather than replacing >the alternator. The regulator on that car is a plastic triangular thing on the back ofthe alternator. It's like, an $18 part held on by two 10mm nuts than you can replace from under the car without jacking it up.  SignatureNeed Mercedes parts ? - http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home page: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net > The alternator has diodes that regulate its power output. Your car's seem > to be failing. > Sometimes these diodes can be replaced separately, rather than replacing > the alternator. The voltage regulator controls the voltage, the diodes rectify the current. The VR is retained in the back of the alternator by 2 screws and on some models can be changed in situ. >The voltage regulator controls the voltage, the diodes rectify the current. >The VR is retained in the back of the alternator by 2 screws and on some >models can be changed in situ. 108s did not have this, 126 does, I *believe* 123's do. Not sure about 114/115 but I *think* they do. Actually I think some 109 cars, later ones, had it too. It's a 5 minute job to replace it. SignatureNeed Mercedes parts ? - http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home page: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net >Hi all, > [quoted text clipped - 4 lines] >shine extra bright, the voltage is about 19 Volts. It's only for about 30 >seconds. Then Voltages decreases to normal level of about 14 Volts. When this happens what else doesn't work? Does absolutley every other electircal thing in the car work? On truism in an MB is when there's an electircal problem with more than one thing, find what they have in common and you've found the problem area. You have a schematic and a volt meter? SignatureNeed Mercedes parts ? - http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home page: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net As far as i know, everything electrical works. > >Hi all, > > [quoted text clipped - 19 lines] > 1970 280SE, 72 280SE | Home page: http://rs79.vrx.net > 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net >As far as i know, everything electrical works. The change the ~$18 coltage regulator on the back of the alternator. SignatureNeed Mercedes parts ? - http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home page: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net > Hi all, > [quoted text clipped - 10 lines] > > Who can help me ? Try replacing the voltage regulator first... DO IT NOW! This can destroy other stuff. |
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