i was driving down the road and i lost power and tach and alternator and a/c ..i read a few posts where it said to replace the crank sensor....i replaced it and still doesn't work can anyone help me???

1995 dodge 3500 12v standard factory

 

Key on sensor unplugged you should see 9v on the orange wire.....you got that?

 

ok key on sunsor unplugged...orange wire no voltage...white wire black stripe 19.0 mvolts

 

If you don't have 10 volts at the orange wire, key on, you either have a bad connection at the pcm, a bad pcm, bad ground or no power to the pcm.

 

No one on this site wants to admit that the older 12v have a problem blowing the computer along with the crank sensor. But trust me I had the same problems as you. You lose all your gauges and a/c controls. It is the the pcm. Take it out and bring it down to the dealer that way they can order you the correct one. They made more than one for that year. So a junkyard PCM would be a needle in a haystack.

 

aight i will try that tomorrow any way for sure to check and make sure it s the pcm...the truck has over 300,000 miles on her.

 

It's actually pretty rare for the PCM to blow. About the only way to test one is to swap it with one that you know that works or swap yours into a truck that is working fine.
A friend has one for a '95 auto that works and probably would be interested in selling since he no longer has the truck. PM me if interested.
He relied on the dealer diagnoses that the PCM was bad, it wasn't. We swapped it into my '95 manual and everything worked fine on my truck.
The real problem ended up being a bad connection at the PCM.

 

Just had mine changed took care of the tach not working all the time,ac not blowing,and trans OD problem.