A good place to start. Going to take some time and alil money, but one of the cheapest, easiest thing you can do.
Pete won’t start again
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Loaderlou, Sep 25, 2020.
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The mt 39’s need a good ground to work good. If the mounting bolts are not giving it a good enough ground you may need to add another 4 ga. ground strap from starter body straight to engine block and maybe a second one to the frame also.
650cat425 Thanks this. -
That’s a good idea SP, I’ll try that. I didn’t have to change my starter because it’s doing the same thing As my old one. But it didn’t hurt to change it since it was original. How bout I mount the ground to one of the mounting bolts and then to the bell housing. I think my next step is changing my battery cables. Not a fun job but I’ll get it done. I guess sooner or later I’ll find the problem. But I’m still open to suggestions
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Also I find my negative studs to be loose. Well not loose but I was able to turn them a quarter of a turn on a couple of occasions where as the positives were tight. Should I clean the threaded stud of the dielectric grease, then tighten the nut and add the grease to coat it?
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There should be a 1/2 or 12 mm threaded stud that either comes straight out of the end of it or the side of the body on some applications. That is the ground lug. Doing it from the bolts is usually a pain because the wires will try to twist when tightened and tend to get oily there.
The negative studs being loose alone could be the cause of all your troubles.
Do you happen to have an analog clock in your dash that started running slow? That was a good indication of ground issues on the older Petes that had that option. -
Hi Small Package. I don’t have an analogical clock unfortunately. But everything works as it should, my radio and teltek clocks are in sync and accurate with my cell phone clock. I probably have enough ground for that but when it comes to starting that’s where it’s lacking I guess. I’m guessing there must be a lot of corrosion in the cables. How long do you think a set of cables lasts. I’m in the NE and work salt every winter
SmallPackage Thanks this.
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