13 replies to this topic

[jwilliams1130]

Can someone help me with the wiring of the coil on the 518, please? I bought the tractor with a missing coil, and now that I have a coil, I need to know which wires go to which terminals.
Any help would be greatly appreciated, thanks in advance,
John

[Texas Deere and Horse]

John,
How many wires are there? What color are the wires? What model of Onan is this?
Brian

[jwilliams1130]

I'll have to get back to you on all that. Tractor is in the mountains. I'll check and let you know next time I go up there. Just thought it would be easy if you had a 518 and could just tell me how yours was hooked up. Seems like there were 4 or 5 wires.

Have to keep it in the mountains because I have a meddlesome neighbor that doesn't like me to have any lgts in my yard, even though she can't see them and they don't bother her.
Thanks, I'll get back to you when I get all that info.

[Texas Deere and Horse]

John,
What mountains, I used to live out by Franklin,N.C.. Just got back from there visiting wife's family.I can problibly find the wiring layout for you if I knew what mdel Onan?
Brian

[jwilliams1130]

I bought some land enough for a small homestead up in Galax/Hillsville Virginia area. I can't wait to get up there and start living. I have a bunch of old garden tractors and regular mowers that I want to work on. I would appreciate any help you can give once I get the model number and all that. It is an 18 hp Onan twin engine, but I don't know the exact model number. I will certainly get that and send it to you next time I go up there, which should be in the next week or so. I was going up this weekend, but I only have a camper up there and I hate staying in it when it gets down in the teens, like it is supposed to be this weekend.
Thanks again for your offer and I will get back to you soon.

Edited by jwilliams1130, January 06, 2011 - 07:32 PM.

[GWest]

The 518xi uses a Kohler twin. Is that what you have? Any idea of the year?

Garry

[jwilliams1130]

my tractor is a 518H. It has an Onan 18 h.p., should be around a 1988 model.

[jwilliams1130]

I just saw one like it on ebay and that engine is a: 18HP 2 cylinder Onan Performer 18XSL Engine serial # L883482150

[olcowhand]

my tractor is a 518H. It has an Onan 18 h.p., should be around a 1988 model.

Getting confusing. In post #1 you said it was an Onan, then in post #5 you stated it was a Kohler???????

[bhts]

The orginal engine should be a onan 18HP model p218 spec 10539.You need to make sure this is the motor you have to get the correct coil hook up.

[jwilliams1130]

Sorry, I meant Onan. I have changed that to Onan.
Thanks for catching that.

[olcowhand]

Your replacement coil should be part #166-0820 for electronic ignition. + on coil goes to 12VDC, the - terminal goes to the module under the flywheel.

[jms180]

I have some wiring diagrams for Onan engines if you need. P216 P218 and P22o. send email to jms180@knology.net

[kbowley]

1. There is one wire, a black wire from ignition module switch, that goes to the negative (-) side of coil.
2. There are two wires going to the positive (+) terminal, one wire is red and goes to the ignition module, the other is yellow/black and comes from the PTO switch behind the PTO lever.
3. the ignition module is behind the flywheel (left side bottom of engine)


4. If it still does not start, run a jumper wire from the positive battery terminal (+) directly to the positive (+) side of the coil.

Kevin