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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 06-01-2014
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Ironbutt62 Ironbutt62 is offline
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Default 97 WB. Gages acting strange.

Hey Folks,
On the road and noticed some weirdness with my gages. Departure leg Friday, I noticed none of the issues below. Boondocked the last couple of nights running generator for a couple of hours in the heat of the afternoon. On the road this morning: DC Volts coach is pegged out. DC volts engine is 16. oil pressure is pegged at 80. water temperature seems to be running a little high and oil temperature seems to be running a little high both are steady. Tachometer is inop.
At idle, there is slight gage movement on the electrical gauges and oil pressure.
With engine off, water and oil temp gauges drop to normal.
Sitting in a parking lot now with gennie running engine off key on. Coach and engine volts are 14. Alt amps is at 100. Oil pressure is 0.Oil and water temps are dropping as expected.
Haven't had a chance to search yet. Son is playing in state lax championship in 20 minutes. Then I'll have some to to research.

Any ideas?

Thanks Deet
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  #2  
Old 06-01-2014
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measure with a meter the alternator output, or battery voltage with engine running
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  #3  
Old 06-01-2014
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Possible alternator controller failure.

Possible poor ground connection. (With any electrical problem, the first thing is to check all the grounds. They're in the engine compartment, curb side, along side the engine and on the back bulkhead (on your right as you open the side door to the engine compartment). Do not just "inspect" -- put a wrench on the nuts and see if they're really tight -- they can "look" OK, but may not be.)

Then I'd worry about the possible alternator failure. If it's putting out high voltage, it could make the instruments read incorrectly.
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  #4  
Old 06-01-2014
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finally got a chance to look at it. Very odd, seeing 18 volts at the alternator. But only on a couple of the batteries. 12.50 at the ignition terminal and 3.7 volts at the exciter terminal. Some of the batteries red 12.50 and others read 18 with the engine running. Belt was a little loose so I tightened it up. Figured I would just run it home 100 miles and work on it when I got there. When get on the road again and all gauges re normal.
not sure what happened. Cant imagine a slight tightening the belt would have that effect, I will take it for now. Will check the grounds and batteries this week once I get home.
Thanks for the replies.
Deet
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  #5  
Old 06-01-2014
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Stopped for gas. Restarted engine. Dc voltmeters fluctuated a little and then pegged. Everything just like before. 25 miles back to my garage.
When I got there smelled a funny smell and heard gurgling from the engine compartment. One start battery has failed, over pressurized. Took it out of the circuit and all gages back to normal. Debating whether to change the one or all three. Depends on cost I guess.
Glad to be home, but enjoyed the trip a lot.
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  #6  
Old 06-01-2014
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Internally shorted battery?
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  #7  
Old 06-01-2014
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Seems like it. Hope I didn't goon up the alternator.
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Old 06-01-2014
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1 battery will kill the others- better to have 3 good ones. I replaced all 10 batteries in my coach.
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  #9  
Old 06-01-2014
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Deet,, mine started pegging the Volts, 16-18,, mine was one bad engine battery. A house battery would probably do the same.
You can get a load tester at OReily's for about $50, just have to disconnect the batteries and test one at a time.
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  #10  
Old 06-01-2014
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$100 a pop at NAPA. looks like 3 new batteries in my near future. Worth the piece of mind. Mallie: Any alternator issues when you had your bad one?
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