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2005 Freightliner Columbia Fuse Box Diagram Freightliner

A C Compressor For 2007 Columbia Wiring Diagram - Auto
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Freightliner Columbia 2007,ac compressor clutch Won't
Freightliner Columbia 2007,ac compressor clutch Won't engage , getting a constant 12 volt feed to The clutch but never a ground . What I would do is first change wires back at a/c clutch,hook wire up to ground stud on starter were it should be,and see what you get.Hi David and welcome Please do not rate until all your questions are answered that way you wont have to pay twice Use reply to expert link Thanks spanky When you switched ac compressor did you replace a/c clutch? The a/c clutch grounds to compressor itself, the power comes from ac relay through binary switch to compressor and you have power at clutch just no ground. Ohm out two wires at ac clutch with wires off, you should see resistance if open you need new a/c clutch Let me know thanks spanky I'm normally on-line from 7am-5pm cst so we can continue if need be.The Wiring schematic I have according to a 2007 shows that the ecm provides ground to ac relay,which sends power through binary switch to compressor,the ground goes straight to engine ground. Here is the schematic I have and paste to web bar http://ww2answer/uploads/gowest/2011-04-30_172426_ac If this is not your set up let me know and I will look for another one. Even if it came with a new clutch you still should ohm out just to make sure.Morning David,For now I just want you to measure resistance of clutch itself. Disconnect plug from clutch and measure resistance of the clutch, I just want to make sure it is not open,according to the wiring and you telling me you have power going to compressor clutch it should be on. Measure resistance of clutch plug going to compressor clutch not harness,plug disconnected, just connect your leads to two plug terminals going to the clutch is that resistance? Then with plug disconnected read voltage of wire # XXXXX at plug [harness side]to ground engine running with ac on you should have 12volts. Then at same plug wire #1204 measure resistance to engine ground, should be under 5 ohms. Let me know what you have and we can continue Thanks spankyThe one that has 0 resistance to ground is your problem. The ecm does not control ground it only controls hot and you have hot. The other wire should go to engine ground, look for a stud on top of engine head or on side of block there should be a couple of sets of wires going to that stud which is for all engine grounds it may also be by ecmk and see if someone left one off or one is loose, do a ten pound pull test. Then just for test purposes remove ground wire from ac plug [harness wire]and put back on ac clutch and run engine with ac on and use a jumper wire from engine ground and ground ac clutch, the clutch should now come on. Then check all your controls for proper operation. I can't access Freightliner diagrams by serial# XXXXX have some and never does the ecm control both hot and ground only one or the other no matter what manufacturer. Let me know how it goes spankyWhat is smoking? When you applied ground to ac clutch did you remove the ground wire out of plug like I asked you to do? I wanted that removed to avoid a back feed of a shorted wire. It sounds like someone has messed with wiring because if you have power to clutch and take other wire out there should be no smoke and compressor should come on completing the circuit. Let me know what you did because you said you had power at clutch but found 97t wires from binary not connected and those are were the ac clutch gets it's power.David it sounds like a nightmare I've had my share. The reason it smokes when wires were reversed is there is a diode inside the clutch. Somewhere that ground wire is not grounded in the harness.[broken wire] It does not get a ground from anywhere like a sensor or ecm it is supposed to be grounded all the time. So make a short lead out of clutch and go direct to ground on one of the mounting bolts of the compressor, that way you don't have to worry about were it is bad in the harness. Then test all your functions if okay then your done. Let me know how it goes spankyThat feed comes from ac request from thermostat potentiometer, turn your heat cold control knob to hot and it should take away power. That is controlled by hvac module. Also make sure it's not on defrost because ac runs when on defrost to keep system lubed. Ether way try and let me knowSomeone must have messed up that wiring. With ignition off there should be no way that it has any power. Start pulling fuses and see which one is feeding power to clutch. Your going to have to start from batteries to fuse panel and find were they added something. Do you have power there with hvac control module disconnected? Remember the two wires you found from binary switch wasn't connected but you had power, so something is shorted. I'll see if I can find any more diagrams but I don't have access to FreightlinerDid someone add on anything like radio,extra lights,power supplies cb's,anything? You will have to look at all add on's, I know how frustrated you are and I'm not there to see what else it could be so I'm frustrated to because it makes no sense. I wish I had a easy answer or any answer at this point. What about a hot box for heating truck without engine running? Also try disconnecting engine ecm,there are relays in there maybe one is stuck on? Do you have a scan tool to check what ecm is requesting? At least you would know if its in the engine harness or something else. I'm getting of for today so I'll talk to you in am If There's anything else you can tell me just let me know spankyLet me know what you find I would be interested in knowing what happened. I forgot to ask if it still had power to clutch with ac relay removed, but I think it did since binary switch was not even connected when you had power? Talk to you later spanky
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