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#1
10-05-2006, 10:50 PM
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pulsating lighs, 86 420SEL
I noticed last evening that the map light seemed to pulsate in brightness in a rhythmic fashion...tonight the dash lights were doing it, so I stopped, got out, looked around, and every light on the car was visibly pulsing. I parked the car for an hour, got in, turned on the lights, and NO PULSE, just normal lights. What's going on?
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2002 Ford ZX2 2 x 2013 Honda Civics 
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#3
10-06-2006, 09:49 AM
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dirty or compromised battery connections?
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#4
10-06-2006, 10:06 AM
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My 560 used to do this off and on and drive me nuts. I had bought a voltage regulator for it but it stopped doing it before I ever got the chance to put it in. I have no idea what caused it!
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 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#5
10-06-2006, 09:41 PM
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I would suspect a faulty voltage regulator, (and alternator diode?).
Please check battery voltage, then start engine and check battery voltage again with engine at idle. I think that more than 14 volts at idle indicates a problem with the regulator and I would not drive the car much for fear of damaging $$$$ electrical components. Beware overcharging as this will create more problems including ruining your battery. Your best bet might be to have the alternator tested by a pro asap. Acky
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#6
10-06-2006, 11:33 PM
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My friendly shop foreman at the dealer seems to think it's worn brushes in the alternator...says he's never heard of such a thing though?!
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2002 Ford ZX2 2 x 2013 Honda Civics
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#7
06-04-2008, 10:24 PM
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Mine is also doing the same situation when the lights are on and at a stop. It annoys me but you can visibly see the lights pulse in a reflection with a car in front of me. Once I'm off, the pulsing stops. My car is charging at 14.2 at idle 800rpm. If I drop the idle to 650-700rpm it will pulse more and lights seem to dim. Does this also spell and Alternator or Voltage Regulator? The belts are new as well as the battery.
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"Why operate within the law when you can operate above it?" MB roster '85 500SE euro Ratrod '92 500E's x2 / '94 E500 stored '91 560SEC w/43K stored '92 Cabby 16V OE 2.1 AutoX car JDM RHD cars now.
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#8
06-05-2008, 10:48 AM
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There are several possible causes, propper testing should find the culprit.
The following should be tested by you or a quallified person/tech with propper equipment. Faulty or under rated alternator Faulty voltage regulator Faulty ground - alternator - engine - chasis - battery Faulty - too high resistance in feed wire or connection from alternator to junction to battery Faulty battery Good luck
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