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Old 09-17-2010, 06:10 PM   #29
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Old Scout is a very knowledgeable fellow.

Well now the whole truth comes out, 7300' ASL is kinda high. Please note on page 9 of the owner’s manual (page 11 talks about cold weather operation) the generator is de-rated by around 1200+ watts because of the high elevation. And because you are up in high elevation it’s no wonder it’s hard to start. Although I am going to assume your fuel tank is full (previous post) the lower the level the harder the fuel pump needs to work to get diesel to the genset for operation. I don’t know if the high elevation has a bearing on this specific action or not.
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Old 09-18-2010, 11:44 AM   #30
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Parked next door to goferfam/Franz. Tried helping out with the cold starting issue.
After trying/testing there is no power to the glow plugs. If the wire is removed, we then get 12v.
Tried contacting Onan but no response.
Anyone know of a wiring diagram? Would like to find the relay from the switch.
We are parked in Klamath, CA with hook-ups until Oct 1st. Salmon Fishing is lousy. Raining right now.
If we get ambitious, will take the front cap off and tear into it a little more.
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Old 09-18-2010, 05:39 PM   #31
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So when you unhook from the glow plug you have 12 volts and when you reconnect you don't have the 12 volts. Is that right. Either the glow plug is dropping the 12 volts or the glow plug is grounded and your 12 volts are going to ground. What happen when you have the plug removed and still connect to the 12 volt supply. Do you still have 12 volts?
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Old 09-18-2010, 10:51 PM   #32
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gen

OneRVer,
Correct. 12v when disconnected and nothing when connected.
Tested the glow plugs on the bench and they get hot.
But that was with a separate 12v supply.
If not raining tomorrow, will pull a plug and use the 12v supplied to the glow plugs. They probably won't or should not get hot.
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Old 09-18-2010, 11:46 PM   #33
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I am shooting in the dark here, but, if you connect the RV 12 volts to the glow plug while installed and you lose the 12 volts then I would guess that the RV battery is not strong enough to supply the needed current to heat up the glow plug thus dropping the 12 volts to ground. Without being able to see what all is going on and thinking I am understanding you correctly, the battery/batteries would be my first point of attack.

With this said. I am assuming that when the glow plug is out and you are connected to the RV battery you do have 12 volts. With the glow plug installed and connected to the RV battery you lose the 12 volts. But on a test bench with a separate power supply the glow plug heats up. How am I doing so far?

Would be interesting to see what kind of amps you are pulling when testing on the bench Vs installed in the generator.
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Old 09-19-2010, 08:38 AM   #34
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My guess is that the glow plug solenoid has pitted contacts. This will result in a full 12V reading at the glow plug wire if it is not connected to the glow plug. When the wire is connected to the glow plug, the current flow results in the voltage drop across the solenoid contacts. A way to confirn this is to test the voltage on each side of the solenoid contacts, with the glow plugs not connected and with them connected. If you have 12V at the supply side but not on the glow plug side with the wire connected, the solenoid is faulty.
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Old 09-19-2010, 10:02 AM   #35
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Quote:
Originally Posted by Wil Rathke View Post
My guess is that the glow plug solenoid has pitted contacts. This will result in a full 12V reading at the glow plug wire if it is not connected to the glow plug. When the wire is connected to the glow plug, the current flow results in the voltage drop across the solenoid contacts. A way to confirn this is to test the voltage on each side of the solenoid contacts, with the glow plugs not connected and with them connected. If you have 12V at the supply side but not on the glow plug side with the wire connected, the solenoid is faulty.
This is a good point. If the contacts are bad you can still see the 12 volts but will not be able to pass much current. I think you might have solved this Will.
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Old 09-19-2010, 05:15 PM   #36
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Wil, think this is the case. thought it might be a solenoid or ......?
Next: Where is the solenoid?
Just remembered you helped us with our solenoid when the gen slide would not work at the Hilton Head rally.
Thanks, Gary
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Old 09-20-2010, 12:27 PM   #37
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The solenoid will probably be in the gen housing somewhere. I suggest tracing the wires from the glow plugs to the solenoid. Good luck.
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