Dear fellow enthusiasts,
I have a 1986 LJ70 from Switzerland that shipped from the factory without a/c. The importer here in Liberia had a local shop install a/c and it works well with some limitations. The power to the auxiliary fan on the condenser and to the a/c compressor are wired through my rear defroster switch, which has constant power. I turn the defroster switch on and the a/c clutch comes on along with the aux fan. If I turn the car off, the fan keeps running, which can drain the battery. There is no thermistor working in the circuit so the compressor runs constantly. I assume that the a/c system was removed from a J7X of some sort but I don't have access to the original installer. The a/c / heat control unit doesn't have the rheostat setup from a later car that triggers the compressor. The power that comes into the rear defroster switch appears to originate in a relay that is buried in the passenger footwell (at least it is the same color and pattern. The installer used the same color and pattern of wire all over the thing so I need to investigate further to be sure). It goes from the defroster switch to the black wire on the blower fan switch on the control panel and another wire has been spliced from one of the fan switch wires into the large white with black stripe wire that goes up into the middle of the dash through a factory harness. I do have the blank spot on the front of the control panel that looks like some sort of toggle switch could go there. It is about 3/4 inches wide and 1.25 inches tall.
My goals in rewiring the thing are: 1) make the aux fan work with switched power (I don't know if it is actually meant to be hot all the time with a relay to turn it on and off based on coolant temp), 2) make the a/c clutch work with switched power and 3) have the a/c clutch cycle on and off with the thermistor. I can leave item 3 to another local a/c shop if I need to depressurize the system to deal with it.
In any event, I'm looking for either the wiring diagrams that would help me sort out how the various relays and such should work and/or a written descriptive of what is energized when. If someone here would be willing to answer questions via email or this forum about the best way to wire it the way it should be, I can list what is connected to what in the harness.
I have a 12 volt dual battery system.
Much thanks in advance,
Rich
I have a 1986 LJ70 from Switzerland that shipped from the factory without a/c. The importer here in Liberia had a local shop install a/c and it works well with some limitations. The power to the auxiliary fan on the condenser and to the a/c compressor are wired through my rear defroster switch, which has constant power. I turn the defroster switch on and the a/c clutch comes on along with the aux fan. If I turn the car off, the fan keeps running, which can drain the battery. There is no thermistor working in the circuit so the compressor runs constantly. I assume that the a/c system was removed from a J7X of some sort but I don't have access to the original installer. The a/c / heat control unit doesn't have the rheostat setup from a later car that triggers the compressor. The power that comes into the rear defroster switch appears to originate in a relay that is buried in the passenger footwell (at least it is the same color and pattern. The installer used the same color and pattern of wire all over the thing so I need to investigate further to be sure). It goes from the defroster switch to the black wire on the blower fan switch on the control panel and another wire has been spliced from one of the fan switch wires into the large white with black stripe wire that goes up into the middle of the dash through a factory harness. I do have the blank spot on the front of the control panel that looks like some sort of toggle switch could go there. It is about 3/4 inches wide and 1.25 inches tall.
My goals in rewiring the thing are: 1) make the aux fan work with switched power (I don't know if it is actually meant to be hot all the time with a relay to turn it on and off based on coolant temp), 2) make the a/c clutch work with switched power and 3) have the a/c clutch cycle on and off with the thermistor. I can leave item 3 to another local a/c shop if I need to depressurize the system to deal with it.
In any event, I'm looking for either the wiring diagrams that would help me sort out how the various relays and such should work and/or a written descriptive of what is energized when. If someone here would be willing to answer questions via email or this forum about the best way to wire it the way it should be, I can list what is connected to what in the harness.
I have a 12 volt dual battery system.
Much thanks in advance,
Rich
