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Old 10-04-2018, 03:32 PM   #1
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Join Date: Aug 2018
Location: Watkins, Iowa
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Year: 2006
Coachwork: IH
Chassis: FE 300
Engine: DT 466
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Starter staying engaged, head scratcher!!

I was having the starter sticking or staying engaged periodically. I just assumed it was the bigger of the two solenoids attached to the starter so I took it in and had it replaced.

Hooking it all back up, I and wasn't sure about a second small wire being connected with the little wire coming down from the key. I assume its an ECM wire but not sure. So I left it unhooked to test the new solenoid.

Starter worked fine but the bus wouldn't fire so I hooked what I think is ECM wire and the starter stuck enguaged the first try.

I've tested the starter/key switch and it works ok.

I have grounded my interlock relay a few months ago and the starter was working ok till it started sticking.


If anyone has a 2006 IH 466, would you look and tell me if you have two red wires on the spot that energizes the starter?

Wondering if the ECM or what ever that 2nd wire is, is feeding 12 volts to that energizing connection after I turn the key off?

My dealer wasn't much help, he suggested the key switch but that seems ok.

Where is a good place to look up wiring for this?
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Old 10-04-2018, 04:06 PM   #2
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turns out there are a couple of relays that might be stuck shut so Im off to check them out.
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Old 10-04-2018, 06:33 PM   #3
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not sure how that could be?
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Old 10-04-2018, 06:35 PM   #4
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Usually when a starter starts sticking it means either the bendix is starting to go out or that the starter needs to be pulled and the gear and shaft needs to be cleaned and greases which would make it stick.
Food for thought from a pre computer involved mess mechanic?
Can still do some if I have to.
but for my personal stuff? No way.
Good luck
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Old 10-04-2018, 06:41 PM   #5
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Don't know how to test a relay except for swapping in an equal from the fuse box.
Starters are/were? simple creatures and shouldn't have ECM connections?
Only main hot
Ignition power from the key switch/button
And ground from solenoid to starter body
The starter and bolts ground it to the motor.
Good luck
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Old 10-08-2018, 05:59 PM   #6
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Starter relays

So there are two starter relays, mine were behind the driver side wiper doors, that could be sticking closed and keeping the starter engaged. I bought a new relay and tried it in each of the old positions. My starter continued to stick on.

So I tried to isolate what was adding power to starter after I turned the key off.

I unhooked the two small wires from the starter. 1st I hooked a test light to the wire coming down from interlock relay... that wire alone tested fine.

2nd tested a second red wire from a loom right on top of the starter location. I assume this wire should be hooked up with the 1st wire from interlock. It tests normal.

But when I join the wires together as they would be when they are connected to the starter, the tester lights up and stays lit after I let go of the key. Light goes out if I turn the key to off.

Now I see something called "overcrank protection" and they Talk about it being a yellow relay behind the dash on driver side. headed out to look for that.

Any ideas?
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Old 10-08-2018, 06:01 PM   #7
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By the way... Ive had the starter itself looked at and its ok
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Old 10-08-2018, 06:41 PM   #8
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I think you really need to go back and read about starter operation.
From what you say, I am having trouble following you.
Testing of the red wires? For what, voltage or continuity or why not both?
They each will tell a different story and how to approach a fix.
Could be a bad starter relay that has contacts welded shut thereby keeping the solenoid from grounding out when the key is turned to run position.
Not sure how clearly that relay is marked or if you even have the right one picked out.
Did you take pics of previous connections before you took things apart?
maybe those wires have nothing to do with the start solenoid and are meant to be on the main starter terminals to power other options.
Bendix spring being weak may not be doing it's job but the way you describe things, you have to eliminate the simple things first.
You should just never buy new parts if you don't know the old ones are bad, you have to learn to troubleshoot these things. That is for everybody, starter operation knowledge gives you a chance to repair yourself, otherwise those shops will hose you pretty good.


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Old 10-08-2018, 06:54 PM   #9
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testing for 12 volts, the two red wires are the wires connected to the s terminal on the starter. The starter is supposed to be OK. Bendix is supposed to be OK too. The two small red wires have little rings on them they cant go on battery terminals. s terminal only one they fit on. no pic i admit I am not sure about 2nd wire from loom, but I am sure wire from interlock goes to s terminal. What is odd is when connected together they stay 12 volt energized after I release the key. thus keeping the starter energized.
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Old 10-08-2018, 08:19 PM   #10
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So both red wires have voltage joined together, connected to the solenoid on the starter, with the key off?
If only one is hot when they are separated and key is "off", means a different 12v source.
Wrap that in tape and install the other one without power in the key off position. That wire you just put on will liven up thru the start relay operation. So starter will turn like that? And release?
Worry about the second wire after getting the bus running. It will show up likely. I can't think of any good reason for it to be connected there to the start solenoid, except for future or troubleshooting purposes.


Good luck,


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