I've been working on some AC and heater control and plumbing issues. I'm starting to re-attach some of the wiring, and I've hit a snag. I believe the control in the picture is the thermostat switch for the AC. It has two terminals. The harness pictured has a yellow and a "blue" wire. Can someone tell me if the yellow wire goes on the right or left terminal of the switch? The answer would be great. Some insight on how I could have figured it out would be even better. Thanks for the help.

Dude - We need more information... What year is your Z? You can download the wiring diagram for many Z's from here:

Z Tech Tips Electrical (AtlanticZ.ca)

There is plenty of horsepower here to assist you. Post back.

Dude, my screen name is 78sid. It is a 78 factory ac car. Wiring diagrams are useless since neither terminal is marked and the harness will fit either way. Ive read everything Blue has written. God Bless Him!!

Ha! I see now....I will look at mine and get back with you.

The Dude Abides...:-)

Ok, I cannot make out the color of the darker wire in your pic. So assuming that the wire is blue (with yellow stripe), then the yellow wire will go on the RIGHT. If the wire is black with a green stripe, the yellow wire will go on the LEFT.

BTW - the blue wire with the yellow stripe shares a connection with MAX terminal on the Fan Switch.

Hope that helps.

Looks like you got some heat issues on that yellow wire..

Thanks Zcurves. That helps a lot. The heat/burning was caused by me trying to replace the connector which broken. Not my best work. Should be fine, but I'm going to tape it up. I've had a lot of problems finding the right "style" electrical connectors for replacements.

I have a link where to find the 'right style' connectors

 

datsun-240z-rebuild/wiring-harness-refresh/

It's a simple switch.  If you look at the wiring diagram in the A/C section it shows as such.  That means in actuality it's a single wire that's being broken (switched) by the thermostatic valve.  Either wire can connect to either terminal.  There is no "wrong way" to connect it.  The wiring diagram actually shows both wires attached to the thermostat switch would normally be Black/Green and transition to B/G and Yellow coming out the other side of the white "T" connector...  (AC-38 1978 280Z FSM)  That would have been much less confusing if both wires were B/G.

 

Another "give away" is that the connection is not "keyed" - it uses two male spades on the control and two female on that bit of harness.  If it were important that a certain wire go to a certain terminal, they would have made the connector such that it was obvious - one wire can connect only here, the other wire can connect only there.