with the truck runing-test volts on batt terminals, if good the gauge in the truck may be faulty. did you load test both batts, main 140a fuse good, good clean terminals on the batts. check the volt output (b+ wire) on the alt-the pcm regulator may be bad
The most common suspect is the crank sensor, without a signal from it the PCM does not know the engine is running. The crank sensor is mounted just above the crank damper on the front of the engine just to the passenger side of center. Check the wiring going to the sensor, especially where it passes the belt and where it comes over the front of the head. Also check the connector in the harness for corrosion. Make sure the sensor is mounted securely and that the gap between the sensor and damper is correct. The gap should be 0.050" and should be checked with a non-ferrous feeler gauge. A matchbook cover folded once works OK. If your A/C is still blowing cold and your trans still shifts into overdrive this is not your problem.
The other common problem is a bad ASD relay. An easy way to check that is to swap it for the A/C relay. Of the three relays on the driver's fender, ASD is front and A/C is rear. If you don't find the trouble in the crank sensor wiring or gap checks, swap those relays and see what happens.
If you do not have overdrive then you also do not have a crank sensor. You could have a bad voltage regulator. Please fill out your signature so everyone knows what truck we are trying to help you with.
where is it on the fire wall and what does it look like please could i also get this at a local parts store or would i have to call cummins also how sure are you that this is it or how would i check that this is what it is thanks
So I Went To The Parts Store And They Have The Part Its 43 Dollars Is There Any Way To Check And Make Sure Thats It Before I Bye Or Are You Pretty Sure Thats Its Because Id Like To Not Waste That Much Money If Thats Not It Thanks
