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Old 11-10-2012, 05:32 PM
Jub Jub is offline
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Join Date: Jun 2012
Location: Washington DC
Posts: 418
Electrical flow unsteady?

Hi All,

My 71 Merc 250 (w114) has a really faint (but noticable) waining on and off of the electrical current?

I notice it in my instrument cluster lighting, and both the interior lights at night.

What is that (how can I make it more steady; resistor issue?)


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Old 11-10-2012, 07:33 PM
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Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
Is this when running the engine? Could be a bad alternator, battery or voltage regulator. After that a bad ground, etc. Check battery connections first. And remember, voltage checks do not always mean a healthy output of amperage.
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
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Old 11-14-2012, 04:23 AM
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On my 300se it was the alternator which showed the correct voltage but low aperage
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Old 11-14-2012, 09:15 AM
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Location: Chicagoland
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I just went through the same issue on my Range Rover. It was the voltage regulator.

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