Engine/Transmission (1994 - 1998) Charging System ain't workin'

[Missouri Mule]

I was going by wiring diagram on 8w30-43. But I could of missed a ground. (a-31,a-32)



Wires z-11 and z-12 feed into ground -119. Before when I read thru the manual a couple other gound wire spliced into the z-11 and z-12 wires.



I haven't checked out pin location yet for ground connections.



I know that a-4 is ground for several senors which are gounded thru the PCM.



I haven't re-read all the sections on the PCM.

 

[HoleshotHolset]

Glad to hear it's up and running... . good find guys!!



Matt

 

[Moe]

charging

Go straight to the engine speed sensor. The engine will run without the charging system if the sensor can't see the crank spinning.

 

[Hookemupman]

Need help,lost a/c tach and charging system yesterday,checked all connections and fuses all look ok,replaced speed sensor and still same problem where are the grounds that your running a new ground to the fender for the pcm?Thanks Jason

 

[Missouri Mule]

Hookemupman,

I think the problem ground wire is coming from the engine speed sensor.

The PCM supplies the ground for the engine speed sensors along with other sensors. cavity- A-4 of pcm connector



The ground(g-119) for the PCM is located Left side of engine(driver's side)

about 6 to 8 inches in front of the intake manifold heaters (grid heaters). Ground 119/112 share same bolt.

Oh yeah a/c compressor clutch is on gound 119 also.



So you have ground wires comming from cavity A-4 which supplies several grounds to sensors (including a/c).

Possible broken ground wire coming out of engine speed sensor to pcm ( if this wire is boken loss of tach and charging system is definite, a/c?)

There are two grounds coming out of pcm a-31,a-32 that ground at g-119. ( did not check to see which one 31/32(or both) supplied ground to A-4)



Good luck

 

[kurtperry]

Lost charging system, Tach and AC

Had the same problem a few months back,



My serpentine belt had frayed and cut the wiring harness to the engine speed sensor..... I knew where to start looking thanks to this thread or I would never have seen it!



Thanks for all the good information!!

 

[Howard Durand]

The Importance of grounding

TDR Discussion Forums should be mandatory reading for Dodge Dealer Techs who deal with the CTD.

 

[Bugman]

Mine started doing same thing yesterday after I changed out battery cable ends. My manual shows two ground wires from each negative post, one 6 gauge and one 10 gauge.



I thought maybe I left a wire off, I only have one, (the 6 gauge), on the right negative post.



My belt is frayed, but I don't see that anything has damaged the sensor wires.



It was charging fine before I messed with the cable ends, any ideas?

 

[Bugman]

Scott, that happened to me. Mine was also having random A/C problems. Wired around TC lockup thingy as temp measure. Finally turned out to be the PCM



About $250. 00 I think refurbished from dealer.



Fixed my charging problem with new alternator today. Inside the box was a piece of paper directed at Dodge Diesel owners that no charge is also caused by a problem with the CRANK SENSOR.



Hookemup, it goes on to say that no tach, no cruise and no A/C, along with no charge indicates problem with crank sensor.



I guess the alternator people got tired of us Dodge folks telling them their alternators aint with **** lol,