I have 1999 Durango that Im having issues with. Im getting codes 0753 and 1765. Ive checked the 3-4 shift solenoid and circuit, everything looks good. Im leaning towards the PCM. Another indication of the PCM, with the engine running, I measure 18volts at the battery, that seems high. Im used to seeing around 14 volts on most other vehicles. The battery is bubbling a bit due to over charge I think. With the engine off the battery reads almost 16 volts. I understand that the voltage regulator is inside the PCM so it may be possible that the regulator circuit in the PCM is bad. Also after reading another thread, I grounded the pink wire on the center connector of the PCM, and my codes went away, the transmission shifted normal as well. Anything else I can check before I spend $250 on a reman PCM?

 

No,

Replace the Alternator. The alternator inputs voltage un-regulated by the PCM to the battery thus meaning a direct connection. However, the alternator should be regulated at a maxamum of about 14.6 volts or so. You should replace the alternator and the battery as well.

As for the PCM, I have no idea.

P0753 Trans 3-4 Shift Sol/Trans Relay Circs

P1765-TRANS 12 VOLT SUPPLY RELAY CTRL CIRCUIT

You have some transmission issues dude.

 

I just replaced my battery and had my alternator was reading 13.88. Volts according to the autozone guy. Should I replace my alternator? Maybe the coil too?

 

If all your putting out is 13.88 volts, I would replace the alternator. I always install them in pairs. Get a brand new one, not a rebuilt one.

Coil should be fine.