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Fluctuating Tachometer

Home > Discussion Forum > Mechanic's Corner - Electrical

Email Author email Bill S.  Reply to Message reply to message  Post New Message post new message      search forums
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Fluctuating Tachometer Bill S. 12-21-07  
On a '98 Holiday Rambler Diesel pusher, The dash Voltage gauge slightly pulses, like you would expect in response to your turn signal blinking on and off. The tach gauge swings in unison with the pulses of the volt gauge. I've found that if I turn on some load, such headlights, the tach needle levels out and stays steady. With the diesel, there's little to no elecrical load on the alternator at idle. What's failing?
Re: Fluctuating Tachometer BUBBA THE BUS TECH 12-21-07  
There may be nothing failing. You may have a poor ground in the Alt field cicuit, Tach Circuit(The tach May run off the Alternator tach terminal) A bad ground, poor conection in the alternator or a poor tach head will all show up like this. The tach reads the AC ripple from the alternator, and with an alternator with a problem or the bad conection I said earlyer the tach will do this. I have seen the tach do this for 250,000 miles on comercial units and never get fixed even changing out alternators etc. In my fleet we just remind the drivers they are to have their head lights on all the time and the symptoms go away. In short nothing to worry about unless there is other symptoms. Good Luck.
Re: Fluctuating Tachometer sg.triveni 2-6-08  
Respected sir,

can you please describe the process of fluctuating tachometer with required circuit diagrams?

thanking you sir.


yours sincerely
Re: Fluctuating Tachometer jerry 2-24-08  
I Have A 2002 Holiday Rambler tachometer
Has Starting To Fluctuating On Our last
Trip Out.
Whats The Cost For A new Tach?

thanks:
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