@SteveJ

10 hours ago, Patcon said:

Cody fixed the blower motor today. The cage was binding on the back of the heater box

What does the blue wire from the blower fan plug go to? Cody didn't find it on the wiring diagram

It should be a wire coming off the Accessory Relay. In the 73, it's a blue wire. YMMV according to discussions I've seen on this board in the past. Look at where the Accessory Relay plugs into the wiring harness. One of those wires should be going to the center stack with a bullet connector.

Edited October 13Oct 13 by SteveJ

My early wiring diagram shows a red wire coming off the accessory relay connected to that blue wire. So I'm thinking they might have changed colors at the bullet connector. They did some weird stuff like that on the early cars.

Next time I have my HVAC panel off, I'll take a look, but it might be a couple days.

I wondered if it could be for air conditioning

I also think it's for the AC (compressor motor switch). Nissan supplied a similar, blue-colored wire (with a bullet-style connector) for that purpose as part of the Z's mini-harness (Item #13 in the diagram above).

On 10/13/2025 at 8:21 PM, Patcon said:

I wondered if it could be for air conditioning

I guess you could rotate the switch and see if the blue wire powers up. I cant think of any other reason for it to power up.

I got back in the shop today.

Rear bumper is on. I don't like the fit but it's on for now...

License plate light and hatch badges and I think the rear end is done

Also worked on installing the leather pieces over the wheel arches

I trimmed one of the last pieces and hemmed it with glue