Jump to content

AC wiring (Explain these pics)


joey b

Recommended Posts

I'm not getting power to the compressor. I'm not sure of the pressure in the system but I did remove the pressure sensor and jumper that and still no voltage at the compressor. Does anyone know any of the wiring information that I will need?

Link to comment
Share on other sites

When doing that the A/C cycles. Unfortunately I did not get a chance to jumper the pressure switch AND voltage test at the relay.

 

Nonetheless I do have connections going to the compressor from the relay box, which is good news.

 

When I get time I will jumper at the pressure sensor. I should get voltage at the relay, correct?

Link to comment
Share on other sites

When doing that the A/C cycles. Unfortunately I did not get a chance to jumper the pressure switch AND voltage test at the relay.

 

Nonetheless I do have connections going to the compressor from the relay box, which is good news.

 

When I get time I will jumper at the pressure sensor. I should get voltage at the relay, correct?

not sure. but it sounds correct.

 

the relay if manually operated will operate the compressor even if everything else in the system is busted.

 

do you even have a charge in your ac system? wait, you said you did not know.

 

 

hmm. this always works for me:

 

press the pintle to let some ac escape. give it about a 1 seoncd hold. ac charged y or n?

 

to charge a emply system, I plug the recharge can in, turn the ac on in the car, and then manually operate the relay for 5 - 10 seconds at a time until it starts working on it;s own.

 

YOU DO NOT NEED to bypass the safety valve sensor this way.

 

 

But if your system is empty, i strongly recommend replacing all O-rings($4), the orifice tube($5) and adding liquid pag 150 oil right in the ports on the rear of the compressor. then charging.

Link to comment
Share on other sites

Not entirely correct. One of those is going to be on constant from the battery, and another one is going to be switched by whatever, when the key is on. When that switch is powered, the constant power from the other terminal goes to another terminal, and goes to whatever to power it on. This puts less power drain on the cab power distribution block. Then one is going to be a gound.

 

Number 30 is the constant power.

Number 87A is sending power to whatever when the switch is NOT active.

Number 87 is sending power to whatever when the switch is active.

Number 85 and 86 are the switch that activated the above.

 

I think I am correct on that, its late and I will have to verify this with my manual in the morning.. I could have the 87's reversed...

 

Link to comment
Share on other sites

the empty slot is 87a, if ytou see in the diagram, that is where the voltage from 30 would go, but only while the relay is off.

 

Everything is fine in the relay box! your issue is elsewhere.

 

 

what is the current issue you are working towards? have you tried popping the cap off the relay and manually operating it's inards???

Link to comment
Share on other sites

Yeah, that got the A/C to kick on. I had jumpered the wire at the clutch switch/sensor. I recharged the system and it is working well now. I think that the problem is that when I jumpered the wire the computer was not running the A/C because it was reading a pressure reading of either too high or too low. I'm guessing that the pressure sensor senses both.

 

Thank you for the help though.

Link to comment
Share on other sites

Yeah, that got the A/C to kick on. I had jumpered the wire at the clutch switch/sensor. I recharged the system and it is working well now. I think that the problem is that when I jumpered the wire the computer was not running the A/C because it was reading a pressure reading of either too high or too low. I'm guessing that the pressure sensor senses both.

 

Thank you for the help though.

i believe you are correct. so it is charged and running 100% now? :)

Link to comment
Share on other sites

im wondering ifme not manualy activating y compressor would explain why my recharge neve worked. I tried alot of things but it never worked so i put oin a bypass pulley :high5:

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...