YSTransport

I have a 95 Dodge 5.9L with 148,000 I have lost my A/C,Tach,and alternator any ideas on what has caused this.

oliver foster

PCM failure is a likely cause.
Do you have the wait to start feature when it is cold, still?
If auto does the OD still work?

Welcome to DTR.

YSTransport

Yes I do still have my wait to start and its a Manual

texasprd

IIRC, failure of the Engine Speed Sensor (ESS) or related wiring will cause those symptoms. If the PCM isn't getting an ESS signal, it doesn't know the engine is running so there is no A/C, no tach, no charging.

patdaly

Yep, also check the connector for the ESS, sometimes oil gets in there and will short across pins, take it apart, clean both sides out well with contact cleaner and it might just start working, I have had that work twice now.

Connector is up near the top of the timing cover, passenger side.

YSTransport

I replaced the PCM and the ESS and still the same results any other ideas?

texasprd

Replacing the PCM is the very last resort. Did you check and clean the ESS connector, as Pat mentioned? And did you check all the wiring from that point back to the PCM, as I mentioned in my earlier post? It's very possible you have a broken wire or a wire that has rubbed through and may be grounding. You need to do visual and multimeter checks, which means you'll need to disconnect the harness from the PCM and check the pins for the ESS on the connector.

Do you have access to wiring diagrams?

YSTransport

I do not have access to wiring diagrams. Do you know where I could locate them?

texasprd

I have individual-vehicle subscriptions to alldatadiy.com, which has wiring diagrams. Genos Garage has the actual manuals

texasprd

Any resolution on your problem?

ecmexchange

I was wondering the same thing. Any solution?

YSTransport

After removing all the wiring harness there was a broke ground between the battery and the Pcm once that connection was fixed everything went back to working perfectly. The truck runs good as new.