I have hardwired a powered switch to the compressor. Don't know what else to do.

 

wow thanks for all the help

 

You need to bust out a volt meter and trace back to find power. Something, not necessarily a relay, is breaking your voltage according to your explanation of the situation.

 

So, you're thinking a bad wire ? Thanks, But I can't even imagine trying to trace the wiring harness back to find the last source of power.
I can bypass both sensors and the relay using jumpers and there is still no power getting to the compressor. The ground wire to the compressor is good. I guess I may have to go with what I did and just toggle switch power to it. I feel I'M MISSING SOMETHING, BUT CAN'T THINK OF WHAT IT MAY BE.

 

Its intimidating I know... I do that kinr of thing for a living... not necessarily your wiring... could be your head unit... like the button to turn the ac on... could be in there.

 

Did you check to see if there was power leaving the AC switch by the HVAC Controls?? Im assuing the light is going on to tell you the AC is activated? Just trying to see where power is lost.... before HVAC Control or between HVAC Controls and the AC Compressor it self.

EDIT: Hahaha posted at same time. Deff check the controls and see if the button is doing anything.

 

The A/C button on the dash lights up and the recirc button lights up

 

Thanks guys. I will keep trying as suggestions come. Am I gonna screw anything up my hard wiring it you think ?

 

Im not sure if you will or not.... I just know that the compressor cycles off and on when you have the AC on as the pressure raises and drops.... So having it on the entire time may effect it.... but Im not expert by any means when it comes to car repair and especially AC, so if some one could chime in on this.

 

Well I just tried jumping the relay again and i do get power to the compressor. I swapped the starter relay and the A.C relay but still nothing ! The truck starts so I'm assuming the relays are good ? Any idea why the relay is not getting the power from the low voltage side ? Thanks

 

Have you tried a jumper on the cycle switch? The cycle switch is near the drier. The cycle switches go out often.

 

Where is the dryer ? Thanks

 

I have jumped the connection on top of the compressor and the connection on the condenser ( the cylinder attached to the firewall) When I turn on the A/C button with the key on I have power to both sides hi and Low of the relay. Thanks

 

I have jumped the connection on top of the compressor and the connection on the condenser ( the cylinder attached to the firewall) When I turn on the A/C button with the key on I have power to both sides hi and Low of the relay. So I'm thinking relay, but I swapped starter and A/C relays and still nothing !I know the starter relay is good because my truck starts . Thanks

 

Still digging. I took the cover of the relay and with the A?c on if i ground the #87 pin I get the relay to engage. ? Does anyone where that #87 pin is supposed to ground too? Thanks

 

It just keeps getting more confusing. Grounding the #87 pin on the relay with cause the relay to engage wether the A/C switch is on or off !

 

Sometimes its ground thats switched and not power.

 

Was just all ready to give myself a high 5 when I found a black w/ grey strip wire that grounds on a thermostat housing bolt was not attached. But after reattaching this still nothing ! I/m about ready to let this thing beat me.

 

Where is the dryer ? Thanks

See if this helps: http://www.autozone.com/autozone/repair ... 3f80393825
You can jumper the wires there and get the clutch to engage.

 

Nope. Thanks though. I get power everywhere except to the compressor and if i ground the # 87 pin on the relay it will engage the relay. I am out of ideas!

 

Check all connections behind the controls for the HVAC in the cab. There is either a short or open wire between the AC switch and the relay. The AC switch may light up saying the AC is on... but there still may not be a connection from there to the relay. I would take the controls out in the cab and make sure everything is plugged in and nothing is damaged. If that still all checks out good, I would run a wire from the AC switch to the relay. Thats all that switch does in the cab is ground that 87 pin. So if everything from the relay to AC compressor works and the AC light in the cab is lighting up, then theres something in between thats not there. Check that, then run a wire. Should be simple to do. Maybe the connection under the relay is bad? you can take the fuse box out and unplug a connector under it and look at the connections to make sure nothing is corroded.

 

If you're out of freon it wont kick on?

 

True, if his freon is low, the compressor wont turn on cause you will just burn it out because it uses the freon to help cool and lubricate the compressor. I was going under the assumption his Freon is full.... I guess I cant assume anything. How is your Freon level?

 

freon is full Jordan,Thank You Thank You Thank You. Finally something that makes sense.

 

I will do as you suggest in the morning and let you all know how it turns out. Thanks