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Old 09-11-2020, 08:34 PM   #43
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Quote:
Originally Posted by rwhite1223 View Post
IIRC...
Bat=constant voltage
Acc=sends voltage to accessories and components. Should be constant voltage in all positions but off.
G1=glow plug for a 5 or so second warm up
G2= glow plug for a 1-2 second start assist
Sol=sends voltage to starter relay
To shut a diesel down you have to turn off the fuel. How that is done on your particular engine I have no idea. You'll need to find out which part kills the fuel. It's either stuck open or getting stray voltage from somewhere to keep it open. Based on previous posts I'd guess stray voltage. If you can unhook the battery and kill the motor I'd lean towards stray voltage. Good luck, wiring demons suck.
Thanks for that. I’m going to try to replace the ignition wiring harness now. Strange thing is that disconnecting the batteries did not turn off the engine.

I’m currently thinking it’s either the harness or the fuel shut off solenoid.
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Old 09-11-2020, 09:14 PM   #44
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Can anyone explain this picture to me? While trying to get the engine to turn off, I found this mechanism which frankly looks out of place. It looks like the little stud is supposed to be in the hole on that lever, or maybe thereís a missing cotter or something? Jiggling the lever might have been what stopped the engine eventually, which makes me wonder if this might be part of the engine air intake? I almost got it to latch while the engine was running, but it was too hot to touch for very long. Now that the engine is off, Iíd like to identify what this is and what position it should be in.

Itís a 5.9L Cummins diesel
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Old 09-11-2020, 09:21 PM   #45
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What happens when you pull the relay/solenoid out while it is running??

Having voltage measurements off the switch will provide limited information if there is not a schematic.
Looking for the wiring schematic now. So far I found this in the box I got from the OG owners.
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Old 09-12-2020, 12:35 AM   #46
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Can anyone explain this picture to me? While trying to get the engine to turn off, I found this mechanism which frankly looks out of place. It looks like the little stud is supposed to be in the hole on that lever, or maybe thereís a missing cotter or something? Jiggling the lever might have been what stopped the engine eventually, which makes me wonder if this might be part of the engine air intake? I almost got it to latch while the engine was running, but it was too hot to touch for very long. Now that the engine is off, Iíd like to identify what this is and what position it should be in.

Itís a 5.9L Cummins diesel
I believe that is the turbo waist gate as best canít tell. If Iím correct it should be connected and it helps the turbo spool up quicker. Some engines had a similar valve that was used to allow the engine to warm up quicker by holding exhaust back. Either way it should be connected.
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Old 09-12-2020, 12:39 AM   #47
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Also if there is a groove in the shaft then you need a cir-clip or a snap ring to hold the rod on the shaft. Most auto parts have them.

I could not read the diagram so not sure what you have there.
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Old 09-12-2020, 06:29 AM   #48
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In your 1st post you mentioned disconnecting the house and starter battery and it shut down. That's what lead me to stray voltage. If disconnecting power does nothing then I'd lean towards a stuck solenoid.
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Old 09-12-2020, 06:35 AM   #49
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A google search of 5.9l Cummins wont turn off brought a plethora of posts.
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Old 09-12-2020, 11:21 AM   #50
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If you had both battery banks shut off the alternator could still be delivering the voltage to keep things running.

You need to determine how your engine is actually shut off. Some solenoid could easily be stuck. In any case, when you find it a simple voltage test will tell the story.
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Old 09-13-2020, 06:13 AM   #51
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I agree with YCI , if the batteries are disconnected and engine is still running and there's no voltage at the fuel solenoid that would indicate a faulty device, if there is still voltage, the alternator is providing power and there still could be a
'stray' power source that must be located.

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Old 09-13-2020, 11:09 PM   #52
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Finally found it! Our friend who repairs elevators and teaches electrical systems came out and found the shorting wire, it was an accessory wire that doesn't seem to be doing anything important at all, possibly for the CB radio that we don't use.

Yahtzee!

He just removed it from the master relay, taped it up, and that was that. One little wire that has nothing to do with the systems involved. Probably didn't need to replace the lock and ignition switch, but he did say the old relay was definitely bad. Kind of an expensive lesson, but cheaper than one of his classes.

It was just that silly wire all along! We were able to leave and take the trip with only one hiccup.

Thanks so much to all of you! It was a learning experience.
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Old 09-14-2020, 11:22 PM   #53
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Finally found it! Our friend who repairs elevators and teaches electrical systems came out and found the shorting wire, it was an accessory wire that doesn't seem to be doing anything important at all, possibly for the CB radio that we don't use.

Yahtzee!

He just removed it from the master relay, taped it up, and that was that. One little wire that has nothing to do with the systems involved. Probably didn't need to replace the lock and ignition switch, but he did say the old relay was definitely bad. Kind of an expensive lesson, but cheaper than one of his classes.

It was just that silly wire all along! We were able to leave and take the trip with only one hiccup.

Thanks so much to all of you! It was a learning experience.
Congratulations, happy you found your problem. Wiring gremlins can be one of the toughest to find. Iím glad you found it before replacing your wiring harness.
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Old 09-15-2020, 11:02 AM   #54
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Finally found it! Our friend who repairs elevators and teaches electrical systems came out and found the shorting wire, it was an accessory wire that doesn't seem to be doing anything important at all, possibly for the CB radio that we don't use....
That find is definitely worth a bottle of good scotch!

Glad you are back up and running or not running as appropriate!
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