'2005 F650, no crank, no WTS light, no PCM communication - Diesel Forum - TheDieselStop.com
Ford 650/750 Medium Duties Technical discussion of the new Ford Super Duty 650 and 750 series trucks with Power Stroke, Cummins, or Caterpillar engines.

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post #1 of 2 (permalink) Old 09-27-2018, 12:00 PM Thread Starter
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'2005 F650, no crank, no WTS light, no PCM communication

Hi everyone, I'm new here (posting, I've been lurking for a while for technical info).

I'm working on an 05 F650, it had no drivetrain when I started working on it, I installed a vt365 from a school bus a few months ago. It ran fine for a while, I had to shake out a few gremlins but it was pretty sorted.

Then... this happened. It was running while I was sorting out some A/C issues, then the engine shut off like it had run out of fuel. It has plenty of fuel in it. I tried to crank it and nothing, didn't even try. If I jump the starter with a screwdriver it'll crank fine - won't start, but from the key, nothing. I noticed the Wait to Start light won't illuminate anymore. Also, hooking up the scan tool I'm getting a communication error. One last thing of note, it had a bunch of screwy wiring spliced in, with two toggle switches for what I was told was the auxiliary fuel pump, aftermarket brake controller and the air ride. Well, with them turned off, the radio and A/C compressor wouldn't turn on. Now that this problem started, the switches won't do anything and the radio turns on with them off. I went ahead and ripped all of that crap out and repaired the wiring splices...didn't change anything but I thought it was worth mentioning.

I've gone over the wiring harness and can't find any obvious problems, I've checked a lot of connectors, cleaned terminals, cleaned grounds, and I've made no progress.

I'm ordering the PCM manual off eBay since the ones I have (workshop and wiring diagrams) explicitly have no diagnostic info on the 6.0 PCM (Thanks Ford!) but in the meantime I'm hoping someone here has some ideas. I'm stumped, this is a work truck and it's making me look stupid/bad.
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post #2 of 2 (permalink) Old 09-27-2018, 12:05 PM Thread Starter
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Oh! I forgot to mention I did find 2 blown fuses after this happened, a 60 amp J-case in the engine compartment and a 10 amp fuse in the underdash fuse panel. I replaced them, it didn't change anything, and they haven't re-blown.
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