Ongoing Onan 2500 Generator Frustration

darsben wrote:
Some models of Onan generators exhibit this behavior when the low oil switch activates
SEE: http://www.flightsystems.com/pdf/onan-rv-troubleshooing-guide.pdf

Page 5 may give you your answer

A very common problem with many generators: faulty low-oil sensor switch
Typical example is generator will start but runs for just a few seconds.
Easy trouble shooting is to (check oil level first) short across the switch to bypass it.
If genny runs okay then you know that it's the switch.

I had the same problem with an Onan Camp Power 2500. I found that the start/stop switch on the generator would not stay in the run position. The generator would start with the remote start switch but, unless I wedged the switch on the generator to the run position, it would quit as soon as I let go of the remote start.

It may be a sign of not outputting voltage. My gas 2800 Microlite has done this twice. First time it had 8 hours on it, and was under warranty. It was a failure of the rotor and / or stator ($1600+!!). Second time at 7 years it was a failed voltage regulator; part cost was about $225 from Flight Systems, and I did the diagnosis & repair.

The little Onans get their spark voltage from the battery when cranking. Once the start button is released, they are supposed to get from the voltage they generate. Thus, if there's no voltage, there's no spark.

If you can use a VOM, there's a troubleshooting guide online at the Flight Systems website, I think.

They dropped the Micolite's low oil sensor some time back, I believe before 2000.

Good luck with it.

Jim, "Sobriety is fine, as long as you don't overdo it."

Don't know if you saw this link or not but it might offer you some kind of help. An rv mechanic talked me out of getting this unit because it has time consuming issues.
My immediate thought was dirty contacts ,maybe in that switch or circuit of that remote switch. This link speaks about that.

http://www.justanswer.com/small-engine/3mocn-onan-2500-micro-lite-lp-runs-until-remove-finger.html

Good luck, I hope its a simple fix and you resolve it ,

Bob

Some models of Onan generators exhibit this behavior when the low oil switch activates
SEE: http://www.flightsystems.com/pdf/onan-rv-troubleshooing-guide.pdf

Page 5 may give you your answer

i would have to say a bad switch when releasing its going back to ground and turning off instead a open position