A/C Compressor Wiring

[mcaden]

My seiko A/C compressor (6452 1386 464) has three wires coming from it - 2 are red/black and 1 is black -- that have been cut (I believe there should be a connector attached, but it appears to have been cut off and I have three exposed wires). My high pressure switch has one red/black wire that has been cut and is also exposed. I am trying to hook back up the system and can't figure out how the wires attach.

Clearly one of the red/black wires goes to the high pressure switch or are the 2 red/black wires connected together to the high pressure switch? Where does the black wire go (ground/power)?

I appear to be having the same problem as the person in this thread and he has a picture included. See link:

http://www.r3vlimited.com/board/showthread.php?t=248559

If someone could post some pictures of their wiring for a seiko compressor that would also really help.

FWIW, my a/c system actually works because a PO hacked the compressor wiring to create an on/off direct compressor switch, rather than fix the lower pressure switch. I have now replaced the low pressure switch and am trying to return the system to how it was designed. I have consulted the wiring diagrams to no avail. My car is a 1987 325ic.

Many thanks for your assistance!

Marc

[mcaden]

So I think what I am trying to do is adapt a later model Seiko compressor's wiring (with the later style 3 wire/wiring harness; with triangle shaped adapter) to an earlier style car. I think this Seiko compressor is adaptable, I just need help with where the two red/blk wires and the one blk wire should go. Surely, someone has done this before, right?

Thanks,

Marc

[mcaden]

willinz - just to make sure my system is clear. I have the early style dryer that uses separate low and high pressure switches. However, my compressor has a 3 wire harness designed for the later style dryer that uses a single/unified high-low pressure combination switch. My question is how to adapt the wiring for the later style compressor with the early style dryer.

Thanks for your input.

Marc

[mcaden]

I received the answer I was looking for from another forum, but wanted to post here for the benefit others. Here is the answer:

2 of the compressor wires (red/blk) are to a thermal switch while 1 is to the clutch (blk). The whole circuit basically is to put the high, low (or high/low), thermal overload, and finally the clutch in one series circuit so that any of them can cut the clutch. The 3 wire connector goes like this:

Pressure switches -> connector -> thermal switch -> connector -> jumper wire -> connector -> compressor clutch

I merely had to join the black wire from the compressor to the red/blk wire from the high pressure switch. I decided not to use the thermal switch, so I bundled those wires together out of the way, but the thermal switch could easily be wired.

Hope this helps others.

-Marc