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Here it is. My 6.0 finally did something. All these years and I've got some type of electrical gremlin running around. So my weekend is going to be hunting for some type of electrical issue. I know the batteries are good and my cursory look through the usual electrical suspects are good, but I'll get into it more thoroughly tomorrow.
The head studs did it Tex!.............HAHAHAHA.............nah, seriously, whats it doing?
Well, it was acting like it was the batteries when I tried to start it this evening, all the lights flashing, click, click, clicking, but I load tested the batteries and they turned up good. I did try jumping it and that didn't work, which is something else that makes me think it's other then the batteries.
I did a quick look through at areas that were known to cause wire troubles, but they appeared fine, but I must admit that was a quick run through, I just wanted to get in the house.
It might just be a bad cell in one battery to where it's still good enough to test good, but bad enough to cause starting problems and to where it won't jump.
I will admit though, electrical stuff is not my thing. Most of the time I like to sub this stuff out as it can get on my nerves right quick.
A bad fan clutch or shorted wiring to the fan clutch will keep it from cranking. Unplug the fan clutch and see if it'll crank. If unplugging the fan clutch doesn't help, then try this: Locate the wire to the starter solenoid (yellow with light blue striped colored wire adjacent to the passenger side battery in the engine compartment, near the vacuum pump - it has a "squeeze-and-pull" type connection) ..... you can unplug it and get it to reach the positive battery terminal and try to start it that way.
I had a similiar problem that was intermittent...drove me insane. It turned out to be a loose ground on the block. I had one that was 2 turns loose....cured my mishap. Something to consider...good luck
i had this problem but it was when i switched tunes on my truck. had to get the pcm reflashed and both batteries were bad. doubt its that but who knows
Try blue/yellow wire trick first, if the engine doesn't at least turn over investigate the starter could be a bad solenoid on the starter, a hung up starter or a bum relay. Check for green corrosion around starter & battery terminals.
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