the neutral / backup light switch is on the side of the transmission. You can cut and splice them.
Put a jumper wire across the terminals on the switch if the lights work (with ignition switch set to "on" position) switch is defective
It depends on the vehicle but most of the time you can jumper the low pressure switch....
There is no manual low pressure switch but there is a low pressure switch that turns on the oil light and shuts off the fuel pump to prevent the engine from running with no oil pressure.
Unplug it from the accumulator and run a jumper wire between the two holes. If the compressor clutch remains engaged while the jumper wire is in place, the switch is functioning properly.
Use a jumper across the inertia switch if the fuel pump comes on-its defective
Locate the low pressure cut out switch, unplug the wire connector, using a paper clip jump across the two connections in the electrical plug. This will by pass the low pressure switch and allow the AC compressor to run. THIS IS A TEMPORARY PROCEDURE! Once you have filled the system with freon remove the jumper wire and plug the connection back in to the low pressure switch.
Of which low pressure switch are you speaking? Engine oil pressure switch? If you're checking that, remove the oil pressure sending unit and temporarily put in an oil pressure gauge. If you're checking the AC low pressure switch, pull the switch from the AC low pressure line, Jumper the switch socket and see if the AC compressor comes on. If it does, you either have low refrigerant pressure or a bad switch. If you KNOW the pressure is up and everything else works, you have a bad switch.
Low on freon, faulty pressure switch, faulty clutch. Jumper the low pressure switch with a paperclip (can running, AC on), if the clutch cycles, it's either low on freon, or the low pressure switch is bad.
Inside the transmissison, on the valve body.
low r134, bad low pressure switch