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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 02-07-2020
ias@nni.com ias@nni.com is offline
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Default 1991 pt41? INSTRUMENTS OUT

I am new to the 90's birds as a long time FC35 owner and I am trying to help a friend troubleshoot gauges on his BB 1991 40footer. The fuel gauge, altenator charge gauge and the oil pressure gauge all peg as soon as the key is turned to the on position. All worked well when I a parked it in September and when I went to move it indoors for the winter in late November the problem appeared. Does anyone have a place to start? Does this bus have a voltage stabilizer for these gauges?

David Leggett FC35
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  #2  
Old 02-08-2020
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Randy Dupree Randy Dupree is offline
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The important thing that stands out for me is the alt charge gauge is pegged.
High voltage/high amps can affect everything electronic.
I would put a hand held volt meter on the batterys,before and after starting the engine,to see just what the voltage really is.
If the amps are extremely high you may have a bad battery causing the overcharging,or a shorted cable or even a bad alternator.
Check the easy stuff first.
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  #3  
Old 02-09-2020
Butch Charpentier Butch Charpentier is offline
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Ditto
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Old 02-09-2020
Big Al Big Al is offline
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Quote:
Originally Posted by Randy Dupree View Post
The important thing that stands out for me is the alt charge gauge is pegged.
High voltage/high amps can affect everything electronic.
I would put a hand held volt meter on the batterys,before and after starting the engine,to see just what the voltage really is.
If the amps are extremely high you may have a bad battery causing the overcharging,or a shorted cable or even a bad alternator.
Check the easy stuff first.
This was a very timely post. My alternator also was putting out high voltage. I verified voltage at the batteries. I load tested the batteries and found that one of the engine batteries was bad. Time to buy two batteries.
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