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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14484
Experience:  Certified on Onan and Generac generators
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Onan quiet diesel no glow plugs can I unhook wires and hot

Customer Question

Onan quiet diesel no glow plugs can I unhook wires and hot wire white wire A1J8 for glow plugs stuck in mountains no gen set
Submitted: 3 months ago.
Category: Small Engine
Expert:  Curtis B. replied 3 months ago.

Yes, you can , run battery voltage direct to the glow plug strip. Just don't leave it on longer than 15 seconds at a time, or it will ruin the glow plugs.

Customer: replied 3 months ago.
Genset is not in the open all I can access is the wire I mentioned cannot get to bus at can I hot wire that one
Expert:  Curtis B. replied 3 months ago.

If the wire you mentioned, is glow plug wire, yes you can jump it there, it should go direct to the glow plug strip.

Customer: replied 3 months ago.
You need to tell me if it is correct wire I have no wiring diagram
Expert:  Curtis B. replied 3 months ago.

I do not have the wiring diagram. I thought you had it, how did you come up with wire number?

Customer: replied 3 months ago.
Internet
Expert:  Curtis B. replied 3 months ago.

I can opt out and see if anyone else has the diagram. Sorry. Please do not respond to me, or it will lock the question to me.

Expert:  JON replied 3 months ago.

Sending Manual with Wiring

Expert:  JON replied 3 months ago.

Let me know if this helps or if more info is needed

Customer: replied 3 months ago.
Did not identify wire in question I will restate can I hot wire white wire no A1J8 for glow plug operation ?
Expert:  JON replied 3 months ago.

As Curtis stated. If that wire goes to plugs, yes you can. Can you not see where the wire goes? What site did you get the number from? You just need to get power to the glow plugs

Customer: replied 3 months ago.
Sorry I already knew that just want someone to verify that is correct wire. Thanks for trying.
Expert:  JON replied 3 months ago.

I am on hold with Generator shop that deals in Onan, one moment

Customer: replied 3 months ago.
Ok
Expert:  JON replied 3 months ago.

I had to wait to speak with a Tech, but her had no idea about a wire A1J8. I explained to him everything that has taken place here, and he said tryto power the wire as if not, it may blow a fuse but that is it. He couldn't give me a 100% answer. Sorry. Hope it does work for you

Expert:  Hank F. replied 3 months ago.

Hello, my name is ***** ***** I am going to assist you with this.

I am a certified Onan technician.

Wire A1J8 is indeed the wire that powers the glow plugs.

You can jump 12V directly to the wire to see if the glow plugs are heating up.

In an emergency I would hotwire the glow plugs, but would definitely not call it a permanent fix.

But you need to get the root issue fixed - which is a bad controller.

Expert:  Hank F. replied 3 months ago.

Was this what you wanted to know?