I have the 5.9l version of the 2006 Ram 2500. While I was driving the A/C stopped working. I checked the compressor and the clutch doesn't seem to be engaging. The interior A/C indicator lights up when the button is pushed, the mini fuse in the power distrobution box is good. I have 10.6 volts coming through the harness to the compressor Clutch but no continuity between the terminals on the clutch. This leaves me to believe that the clutch has gone bad or I have to much of a voltage drop somewhere and I should have full 12volts to the clutch...Can someone confirm this or am I missing something.
Have you checked for a compressor clutch relay?
Low on freon or relay issue
Hey guys just thought I would add this, our AC stopped working too. We discovered it was caused by the fan clutch not engaging. Which caused the pressure release on the compressor to blow because the freon was not getting cool enough. This video shows the entire replacement. Hope This Helps
Look for air bubbles in the dryer peep glass
if system is out of gas air con compressor clutch wont kick in
clutch is replaceable
SOURCE: 2006 Dodge ram 2500 diesel Quad, door locks
Try checking under hood in power distribution box for blown fuses also, or bad connection to it.
SOURCE: I have a 91 dodge colt that the ac clutch is not engaging.
if the freon pressure is too high or too low there are two seperate pressure sensors that will disable the a/c clutch to prevent dammage to the compressor. You need to check (or have it checked, dangerous if you do not know how) the pressure on the high and low ports while you have you jumper wire in place and the a/c is running. PLEASE RATE MY solution as I am new on here, Thanks
SOURCE: What causes P0533 & P0532 trouble codes on
P0533 A/C Pressure Sensor High.
It
could be low on refrigerant, or it could be a bad sensor. Back-probe
the
pressure sensor connector (on the discharge line, near the compressor -
it's
a 4-way connector) on the dark blue wire with the engine running and the
A/C
turned to max. If you get no volts, or 5 volts, the sensor is bad. 4.5
volts indicates a properly-operating system, while less than 4.5
indicates
low pressure, and anything above indicates high pressure. If low or
high pressure is suspected, verify with a set of refrigerant gauges.
If warranted, the sensor can just unscrew. You won't lose refrigerant -
there's a valve built in to the line to prevent that. Make sure to use a
new O-ring and lube it with the proper oil if you do change the sensor.
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SOURCE: On my 2007 Dodge 2500
there is no relay in that box that is called the tipm or totally integrated power module. that module is controlled by a computer and should be checked with a scanner to see if you have a code for the a/c. i m having the same problem i have been told it could be low freon but can not get the clutch to engage to check the high and low pressure. Also read where it may be the diode in the clutch on the ac compressor if you have a multimeter probe the compressor a good compressor will read somewhere between 3.5 and 4.0 anything else and clutch needs to be replaced. other possibilities may be the high or low pressure switch on the line. on myh 2006 2500 diesel it is located near the plug for the compressor on bottom side of motor. hope this helps.
SOURCE: A/c compresor quit blowing in
2006 Dodge Ram 2500 Diesel 5.9 Cummins
There is no relay. The pressure sensor sends signal to PCM, then the PCM sends signal to the TIPM or total integrated power module which is sort of self contained fuse box but really a micro computer that controls many things. The Module has had known issues that can affect one of many things. I lean to bad module. Here is the diagram for compressor. 
The Integrated Power Module (IPM) is a combination of the Power Distribution Center (PDC) (1) and the Front Control Module (FCM) (2). The PDC mates directly with the FCM to form the IPM. The PDC is a printed circuit board based module that contains fuses and relays, while the FCM contains the electronics controlling the IPM and other functions. The IPM is located in the engine compartment, next to the battery and connects directly to the battery positive via a stud located on top of the unit. The ground connection is via electrical connectors. The IPM provides the primary means of voltage distribution and protection for the entire vehicle.
The molded plastic IPM housing includes a base and cover. The IPM cover is easily opened or removed for service access by unscrewing the cover retaining nut and has a fuse and relay layout map integral to the inside surface of the cover. This IPM housing base and cover are secured in place via bolts to the left front fender support assembly.
Replaceable components of the IPM assembly are broken down into the following components:
All of the current from the battery and the generator output enters the integrated power module via a stud on the top of the module. The integrated power module cover is removed to access the fuses or relays. Internal connections of all of the power distribution center circuits is accomplished by a combination of bus bars and a printed circuit board.
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