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This sounds to me like a shorted diode in the alternator allowing at least one phase of the output to go negative. Test for this by putting a meter on AC, clip a blocking capacitor (.01 to 10 mfd.) between the red lead of the meter and the output of the alternator. The absolute max ac you could ever see assuming no filtering by the battery would be 12v ac. It should be only on the order of a couple of volts at the alternator an perhaps a half volt at the battery because of the filtration provided by the battery. HOWEVER, if you see an inordinately greater amount of ac voltage at these points, the alternator is putting out AC. This is different than an open diode causing a pulse to be skipped with the dc voltage slumping slightly more than usual. The best way to troubleshoot almost any problem dealing with something other than DC is with an oscilloscope. Maybe someone local is a well equipped ham, or the local radio shop could clip one on and look at the wave form present in the system. The wave form should look like a steady ' m ' not a ' ~ '. Dick in NM ----- Original Message ----- From: Jack Lewis <[EMAIL PROTECTED]> To: Coupes <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Wednesday, March 14, 2001 6:58 PM Subject: Re: [COUPERS] [COUPERS-TECH] alternators > Here's a odd ball one - I've melted the wire on two noise fillters that > connect to the alternator. This is why I think I may be put out AC. The > gauge would peak and then return to normal. After I checked the fillter > would be melted. __________________________________________________ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ____________________________________________________________ T O P I C A -- Learn More. Surf Less. Newsletters, Tips and Discussions on Topics You Choose. http://www.topica.com/partner/tag01
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