AC Compressor wiring r12 to r134a conversation

[ven0m43]

Was hoping someone could help assist me with the ac compressor wiring for the r12 to r134a conversation.

I read the post about how to wire it but mine appears to be different.

The wire from the compressor red/black goes to a 3 wire plug, where two are jumped together and only the red/black goes to a wire harness. Then I have a yellow/black and black joined together going to the high pressure switch and then a white/black to the other connector on the high pressure switch.

The write up for the wire says to solder the yellow/black black and yellow black together and then connect the red/black and black together (from compressor?) To the high pressure and then a 2nd red/black to the other end of the high pressure. However I only have that 1 red/black wire coming from the compressor.

[tomstin]

Get the wiring diagram for your year here: http://wedophones.com/Manuals/BMW/

Maybe from there you'll be able to sort it out.

[e30davie]

I', not relaly sure about the colours but all you need is 12V that come on when your AC button is turned on, you wire this through the pressure switch to the AC clutch. pressure switch controls when the compressor turns off and on. If it were me id poke around the colours you are talking about and see what one is switched 12V when you turn on your AC, then put that to one side of the pressure switch and the other side of pressure switch goes to your compressor.