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Old 04-09-2011, 01:03 PM   #1
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Location: Wenatchee, WA.
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Onan Gen, won't turn over

Onan won't turn over. There is a growling
dull buzzing noise when I hit the starter switch (aux)

One of the bat. teminals is corroded. (two 6 volt Bat.)
However the panel light shows that the house bat.
are green. ??

Corrosion on terminal? Bat. need replaced?

I haven't had a chance yet today to clean terminal
and put a meeter on the two bat. My engine bat. is ok.

Hope I don't need a starter.

Thanks in advance.
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Old 04-09-2011, 04:53 PM   #2
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Since I don't know what the wiring arrangement is... Testing a starting battery should be done with a tester that mimics the load of a starter and most places like AutoZone will do that free. However the easy solution is to jump start from the engine/vehicle battery with the engine running. Do clean the terminals and use a bit of dialectric grease to prevent corrosion.
I recently had to replace the battery in my Subaru, voltage read fine on the VOM but under load (starter) one of the cells was not up to the task and it was no go.
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Old 04-09-2011, 04:57 PM   #3
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I had the same problem, get your multimeter out and test your voltage on the batteries. If you are not fully charged it will click or try to turn then stop. If you have full charge on all batteries, check your fuse on the genset and then the ground strap.
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Old 04-09-2011, 05:31 PM   #4
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If your battery terminals are corroded.. clean them FIRST!! Then check the cable end at the generator and don't just look at it... twist the cable... see if it's corroded in the terminal lug.

I speak from experiance... I cleaned my cable end (the lug), had 12.6 volts at the lug... but it wouldn't turn over... replaced the solenoid and starter and NOTHING!!! STILL DEAD!!! Took the battery out of my car, hooked up the jumper cables and TA DA!!! Started right up. Pealed back the heat shrink on the lug and holy smokes!! talk about corosion... twisted the cable a couple times and guess what.. it now started!! Of course I replace the lug after cleaning the end of the cable thoroughly .
1999 Fleetwood Bounder 32H
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Old 04-09-2011, 09:38 PM   #5
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Thanks Guys

I followed your advice and got the house batteries

Thanks a million.
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