Onan Generator question

[dart451]

Anyone know where I might get a parts list on an Onan generator, believe it's out of a motor home. Mod. 4BGEFA26100F, ser. F880126844 Thank you in advance. Was looking for a ignition coil primarily but I can't find a diagram...

[RoyM]

http://www.partsfortechs.com/asapcart/p ... ter=0&id=7
The coil is listed here.

[dart451]

Thank you very much for the link!

This is the scenario. Customer gets this generator, plays with it...says it would run on starter fluid to the carb but wouldn't draw any fuel. Wanted me to take carb apart, clean which I did. He puts in a switch for the fuel pump, puts one lead on positive side of coil to get power and grounds other side. Fuel pump works perfectly. However, now there is no spark at all. I check 12v at the positive terminal of coil and I also get 12v at the negative pole but still no spark when I turn over the engine. Any guesses out there?

[RoyM]

Did you disconnect the pump then check for spark? What was his reasoning for adding the switch? If he wants it for shutting the fuel off to run the carb dry for the off season he should power it from the accessory side of the ignition switch.

[KE4AVB]

Is the 12V switching on the coil's negative terminal as the engine rotates; otherwords, is the points opening and closing? Also they to making good contact. They to be clean and fully closing an opening at the spec gap. [.0.016 in. (0.41 mm)].

[dart451]

Thank you...I haven't tried that yet...I posted this last night...will check this morning. Thank you.

[dart451]

I just talked with the owner again...he says he was getting spark when he had his switch hooked up to the positive terminal of the coil. For some reason he changed the hot wire to the negative side and he stated that he no longer got the engine to fire at all! That pretty much means he fried the coil I guess...damn!

[KE4AVB]

May have not...As current would steady through the coil thus no surge to generate spark. At it wasn't straight to ground continuously as the fuel pump would provide a current limiting load.

Now he left this with power on continuously then he may have fried the coil.

I send you a link to the service manual that is on my G drive via PM.

[dart451]

May have not...As current would steady through the coil thus no surge to generate spark. At it wasn't straight to ground continuously as the fuel pump would provide a current limiting load.

Now he left this with power on continuously then he may have fried the coil.

I send you a link to the service manual that is on my G drive via PM.

I don't know how long he left the power on the negative terminal...I assume for a bit seeing as you would have had to tighten the nut for it and he tried to start it after that with absolutely no spark at all. He then changed the wire back to positive side and no spark then either! And, I looked at the wiring...he has the power from the positive side of the solenoid to the positive side of the coil. So, the negative side of the coil certainly would have gotten quite a jolt from a fresh battery I would think!?
I ordered a new coil but it looks different than the one on the generator...Onan 166-0772 Ignition Coil.



Actually, I haven't ordered the coil yet...KE4AVB, thank you for the manual! I'm going to check the coil for resistance first...

[dart451]

Just removed coil, supposed to have 3.87-4.73 ohms on primary...this one is about 6 ohms. Secondaries are supposed to be between 34-41.6 ohms, this one is infinity!