6.0 starter turns slow. New batts new starter and new alt
 

Recently noticed my truck seemed to be turning over slow. It did it for a few days then got to the point it wouldn’t crank. I’ve changed the starter just put on new batts in December and had them tested anyway and both came back good. Also changed alt to see if it was grounding out somehow but it lasso made no difference. All accessories run fine and reads 12.4 volts with key on after grid heater cycles. And not losing any power. Getting 12.4 to starter terminal. Been fighting this for a week now and I need my truck back. Any help is appreciated.


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Need to test voltage at the starter as you're trying to crank it. Both at the battery cable end, and at the starter side connection on the solenoid.

We once had a fellow have his 6.0 truck towed in to the shop with a no crank issue. Our tech tried it, opened the hood and cut the belt, tried it again. It started right up. The A/C Compressor was locked up.

-Scott

Hmm. If I pull the belt off should it move freely?


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Ok. I’ll check when I get back home. I tried to jump the connector on the pass side fender that turns starter over and it turned over the same.


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Run a set of jumper cables from battery positive post to larger stud on starter, if it starts up normally u need to replace the cable

Tried that already. Made no difference.


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is it a cheap starter? I also would check accessories. Best long term solution if your cables check out is to put a 6.4 starter in it. Stronger due to the gear reduction and spins much much faster. Direct bolt in.

When checking cables, be sure to also check the condition of the ground connection from the passenger negative wire to the block.

Ended up being a faulty starter. Thanks to everyone!


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