[W126 Coupe] Radio cuts out when playing loud

[Markus Meyer]

 Richard, If you don't have a multi-meter, get one.  You measure the voltage by touching the black lead/wire from the VM to the negative battery post, and the red lead/wire from the VM to the positive battery post, while the car is running/idling.  At idle should be around 14-14.5.  Then have someone do a few things to create a load - turn on the lights, rev the engine, turn on the radio, etc and see what the reading is.  Should slightly drop into the 13's I think but then come back up. Not sure about the regulator versus rebuilding the whole alternator/getting a new one. Markus--- On Thu 07/28, Shayegan, Richard < rishayegan at davidson.edu > wrote:From: Shayegan, Richard [mailto: rishayegan at davidson.edu]To: mbcoupes at mbcoupes.comDate: Thu, 28 Jul 2005 00:24:44 -0400Subject: RE: [W126 Coupe] Radio cuts out when playing loudHow are these for stupid questions:where do I measure the voltage at?so if it doesn't charge 14-14.5, does that indicate the voltage regulator or the 
alternator?Thanks,Richard________________________________From: mbcoupes-bounces at mbcoupes.com on behalf of Dan LandissSent: Wed 7/27/2005 7:15 PMTo: Mercedes Coupes Mailing ListsSubject: Re: [W126 Coupe] Radio cuts out when playing loudShayegan, Richard wrote:>How can I check for myself if the voltage regulator is bad?> >Should charge 14 - 14.5 volts at 2000 RPM, lights off. Turn lights on,it will drop for an instant and then return.--Never argue with a dragon, for you are crunchy and taste good with ketchup.The MB Coupes Website!W126 SEC Mailing ListPostings remain property of MB Coupes, L.L.C.Attachment: winmail.dat (5.17KB)The MB Coupes Website!W126 SEC Mailing ListPostings remain property of MB Coupes, L.L.C.

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