1996 fld120 no power to AC compressor

Somebody had an idea. Any added toggle switches hacked into the dash? That’s what it reminds me of. Someone got fed up and “made it work”. I think the single round wire plug is the hot. Not sure without looking at my parts book. I think the drier switches are 1 hi/lo pressure switch,(4 wires/2 disconnected ), and 1 fan switch,(2 yellow wires) A test light, lookin for hot, may only have 1 wire on compressor. The round plug, pretty sure it’s the hot power supply. 2nd one may just be grounded back to compressor. At this point you don’t even know if compressor is good or bad. Even if it’s powered now, won’t work without a slight charge. Unless you bypass the low side of the pressure switch. Unplug the wires, instead of being connected to the switch. connect them together. Hopefully the 2 connectied wires are for low pressure. If so, you will need to find other 2 wires that connect to the high side of the switch. They might be connected to a dash switch. Wish I could help more. I think the fan switch should be wired into the solinoid. Looks like it may be wired correctly. Start by unplugging the round plug. Check for power. If no power, try jumping wires going to pressure switch to get power. Might just figure it out. Good luck.

 

Top is power supply, as you know. I see it’s not connected to a power supply. Somehow the switch breaks the power, turns compressor off when pressure is too low or too high. I’d have to look at mine. It’s been a while. We fixed a friend’s in similar condition. Someone had eliminated the pressure switch, added a toggle switch. I’m not very good at wiring. But if you can find power source, you can figure out the rest. Gotta start somewhere. Test white wires going to drier for power. 1 of the 2 should be hot with ac turned on. If not, maybe run a constant hot to 1 wire on each half of pressure switch, for now. Then combine the other 2 into 1 and connect to compressor. If it works, you’ll need to connect the 2 supply wires to cab controls instead of a constant hot. May need to add a toggle switch if the wires are missing or shorted out between cab and switch. Then just switch on when using a/c. I’m just guessing at best.

 

Actually it looks pretty obvious that the 2 wires from the pressure switch power the compressor. The 2 cut wires need power going to them. Preferably from the dash a/c switch, but any toggle switched hot wire will probably work if need be.