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Old 05-24-2024, 09:39 AM   #1
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Can't Cruise

Well, I finally replaced my old, heat cracked engine wiring harness on my '07 with 6.0. Feel much better out in the boonies now after having a few starting hassles.

But.... Now my cruise control doesn't work. I have the service manuals which give the very long testing procedure with a VOM and test points. That looks like it will take forever.
So, anyone have an idea what might have happened? Is there any way that the new harness could have been connected wrong? The engine runs great so I assume all is well there? I don't see how the wiring harness would have done it.
Any ideas?

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Old 05-24-2024, 10:05 AM   #2
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Typically a missing ground connection is first place to look. l would check all the grounds in the schematic.

Also, I would check to see if the harnesses were exactly matched in terms of wire fills and placement in the connectors.

I am not an electrical guru like others here! but do like logical approaches.
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Old 05-24-2024, 06:36 PM   #3
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Brake Master cyl pressure switch? ...not sure if the diesel runs this same setup....


Common problem.





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Old 05-24-2024, 09:25 PM   #4
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I was going to suggest this as well and I can confirm the 6.0 diesel does have one of these and they do fail. Simple cheap fix if so, heres hoping that’s it.
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Old 05-25-2024, 06:51 AM   #5
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Thanks for the imput guys.
I'm afraid that 1der is probably right. Especially after having replaced so much wiring.
And yes, the first place I went was to the master cylinder. Pulled the wire off and put a jumper on it. Still no joy.
Arggg, what a pain in the butt.
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Old 05-25-2024, 06:55 AM   #6
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Quote:
Originally Posted by scatter View Post
Thanks for the imput guys.
I'm afraid that 1der is probably right. Especially after having replaced so much wiring.
And yes, the first place I went was to the master cylinder. Pulled the wire off and put a jumper on it. Still no joy.
Arggg, what a pain in the butt.
I've also replaced the actual MC safety switch with a makeshift jumper to no success myself. What I did then was disconnect the existing safety switch with a known good working part temporarily lashing it in place near a hard brake line etc. Seems to make a difference for some reason.

Try that for now---might work out perfectly before digging in to too much work.
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Old 05-26-2024, 09:15 AM   #7
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Hummmm, I thot that jumping it was the best way of checking if the pressure switch was bad.
Easy enough to get a new one and I'll give that a try. But, I'm pretty sure it's somewhere in the wiring seeing as how the harness was replaced. But where???
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Old 05-26-2024, 09:22 AM   #8
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One (or both) youtube videos discuss the switch states when depressing the brake pedal......and how that switch is wired in series with the mechanical switch on the brake pedal for redundancy.

Jumping the pressure switch wires assumes that the switch is normally open(NO)......it may not be.....I didn't pay enough attention to the videos
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Old 05-26-2024, 02:34 PM   #9
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I have had to replace the switch on mine twice over the years.
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Old 05-29-2024, 08:43 AM   #10
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Attached the Mitchell diagnostic procedures for the cruise control for an 07 with the 6.0 diesel.

After the basic checks, you are gonna need a decent scan tool to go much further.
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