Ill be honest...I have a multimeter but have no idea how to do anything with it besides test batterysbatterys

 

Stick the red probe into the brown wire, however you care too.... (might be able to get into the connector there... with it still plugged in please) and then just stick the black probe on anything metal. If you see 12 volts on the brown wire, trace it to the PCM, and make sure it isn't broken somewhere. I do believe the low pressure switch is the last step before the PCM. (which will ground the circuit.)

 

I have juice 8 just checked it like you said too...Im lost here.See like I said I can take the green wire with the white that I spliced on the compressor &separates it ine part to the compressor g?&the other going to the harness I guess&if I ground it it works but...cant be just a ground issue because it wont turn off

 

That's what the switches are for. If pressure gets to high, or low, one or the other of the switches will kill the compressor until things get back into line. That's normal operation.

Since you are getting power to the brown wire, that means both switches are closed. so, there is either a break in the wire between the low pressure switch, and the PCM, or, for whatever reason, the PCM isn't grounding the circuit.

Damn, what an overly complicated system.......

Dodge sure does some strange stuff.......

Ok, taking another look at it.... seems the PCM provides the voltage on that wire, and it comes FROM the PCM, not goes TO it..... Check and see if you are getting power on the light green wire coming out of the high pressure cutoff switch...... Sorry bout that.....

 

Yup... got juice there too that's the one next to the brown or on the compressor?

 

Ok, if you ground the light green wire, the compressor should run normally...... it begins to look like the fault is in the switch in the dash..... that is what provides the ground path, but, the blower motor also uses the same ground. You can check the light green wire at the connector on the control head...... (should be fun to dig to...) if you have power there.... it's in the control head.

Just out of idle curiosity, you do you the controls set for some flavor of a/c, right? (basically, anything OTHER THAN Heat, or Off.....)

 

Ok well...few things thanks to the creative of dodge...I have a gapping hole right above my hvac controls so I can see all if the wires,if its just the light green I do have a reading its very low oo.3 if its the light green with the whilte line I have a readong of 00.9,I still have the sucking sound frombthe control like the control has failed

 

That's prolly a vacuum leak. Light green wire is the one that completes the circuit at the control head. If voltage is really low there, you probably have an open somewhere between that connector, and the high pressure switch. That should be fun to find.....

 

An open what?Could it be something that ai didnt put back on right after my plenum fix?What should I look for?&could it be the pig tail plug is bad or the wire where I spliced it?&last question since its not the pressure switch can If I cant find it will it be safe to run a toggle switch to engage it till I can afford to take it to a shop?

 

Open circuit.

The PCM puts a voltage down the brown wire, that passes thru the low pressure switch, to the light green with white trace wire, then to the high pressure switch, to the light green wire, and then off to the control head. When the PCM sees that circuit as 'complete', it trips the relay that actually controls the A/C compressor..... (yeah, needlessly complicated.) Somewhere between the high pressure switch, and the control head, that wire is either broken, or crimped, or just a crummy connection, so you aren't getting the voltage across it that the PCM wants to see to turn on the compressor. So, ya need to follow the light green wire, from the high pressure switch, to the heater control head........ and find the problem spot.

If you just wanna put a toggle on it for now, use the light green wire (that is, AFTER the high pressure switch) to control the circuit. (basically, just a toggle to ground..... switch on, compressor runs like it should, switch off, compressor doesn't run at all.) That way, both switches will ALSO still control the circuit.