1995 5.9 cummins loses tach signal,speedometer and quits charging
 

After this truck is warmed up and the glowplugs curcuit isnt on once the truck starts it will only charge for about 10 seconds then the tach quits and quits charging. The alt. was replaced and the crank sensor were replaced. It would charge longer before the crank sensor was replaced sometimes for 10 or 15 minutes or longer. looked for bad grounds and loose connections cant find anything. the only code was for a faulty a/c clutch. Anyone have this problem???? Thanks Bob

Welcome to the board.

I think there is something wrong with your crankshaft position sensor. Maybe you got a bad replacement part. Maybe it was connected wrong. If the A/C, charging system, and tach all don't work then it's gotta be the CPS.

Do a search for "crankshaft position sensor" and you'll find some good info.

The PCM has internal slow blow circuit breakers to protect it from damage. If there is a short to ground from one of the sensor supply voltages electronic functions including charge and tach will fail after a few minutes then be restored again after the key is off for awhile. There are several sensors or their wiring that could be shorting to ground, the TPS, CPS, IAT, VSS and WIF.
Most often when I run into these sort of problems it's owner induced, ask about any new wiring or owner efforts to correct the problem.
These types of problems can be very time consuming to diagnose.

Just went through the same thing with my 95 dodge.I changed everything,I bought a used PCM the last thing. No problems since.

Good idea if possible to install your PCM into a donor truck and see if it is indeed the problem. A friend of mine didn't do that recently and now has two good PCMs. His problem ended up being poor connections at the female PCM connectors caused by his probing with a voltmeter expanding the connectors.

Do the Crankshaft Postition Sensor. Mine did the same thing last summer, and that was the problem.

Eric