M.Bonanni

Thanks everyone! Next question is, where is the factory location? Or was this some sort of work around done by a previous owner? I can't find any photos with it in a 280Z. Previous owner had it mounted on the side of the center console.

Car is a '78 280Z with air conditioning and manual trans, only reason I state that is because it may or may not pertain to this particular knob... After doing as much research as I can I am fairly certain this is not factory or has at least been tampered with if it is factory, I can't for the life of me figure out what it could possibly be for though as from tracing the wires it seems air conditioning related. It's a factory air conditioned car, but it doesn't currently work so I can't tell if turning the knob has any effects on the AC. It doesn't appear to have any noticeable effects on anything else. Some of the wiring connections are definitely not factory, some look like they could be. Here's where the wires go, hopefully someone on here can help diagnose so I can see if I need to keep it or if I can remove it. Black Wire: Goes from the knob straight to the AC compressor in the engine bay. Bare Wire: Goes from the knob into the AC vent/fan motor unit behind the dash. Without completely tearing this apart I can't see where this wire ends exactly. Green Wire: Goes from the knob around to the passenger footwell and is spliced into the C7 connector's solid green wire. From there that green wire goes through the following journey, making multiple splits... - Fuse box - Brake Warning Lamp Check Relay - Seat Belt Warning Timer Unit - C6 connector > Fuel Level Warning Lamp - C4 connector > Back Up Lamp Switch White Wire: Spliced off of the green wire, end is cut, no connection to anything. The green/black/bare wires are the only ones attached to the unit. My guess is that the green and black are in/out power sources and the bare wire is ground or some sort of temp sensor, and the white one used to power something that's no longer there. My best guess is that it is some sort of factory temperature control adjustment for the AC system. Why it would be there instead of using the factory one though I haven't the slightest idea. Any theories?

Much appreciated fellas!

Thanks! I saw that on there, but didn't see one for the 280Z. I need to contact them though anyway regarding stock on some other parts I need (right side windshield wiper arm). I will ask!

Just picked up a new (to me) '78 280Z and I am dying to drive it, problem is it is missing the driver's side (left) lap belt. It has the shoulder belt but the previous owner was a larger gentlemen who apparently thought it was best to remove the lap belt to fit better. He no longer has it and I can't find anyone that sells OEM or replacements. Hoping someone on here has some laying around! Also, if you know of a place that sells NOS or direct replacement belts that would work too. Thanks in advance!