heater switch schematic info

[bob m]

I have a 1972 240z and the heater blower switch does not have 12v from the plug under the dash. My 240z chassis electrical schematic does not show a heater switch or wiring. Maybe I missed it. Where does this circuit get its power?

Thanks

Bob M

[Nissanman]

I have the diagram for a basic model S30 for USA, I'm guessing it will be the same.

It shows a 30A inline fuse fitted to an L [bLue] wire.

The fan blower switch is wired to that inline fuse as R [Red] wire.

So, if you trace the single R wire back into the centre console area, it should go to that inline fuse holder.

I'm guessing the fuse is Kaput:rolleyes:

The inline fuse gets its' battery feed from a 20A fuse [ACC.] fitted to the main fuse block.

[EScanlon]

Graeme;

In that same diagram, look towards the top. You'll see an item labeled "Cooler". Trace the wiring that goes there and you'll see that it is what is controlled by the Accessory Relay. (As well as the Rear Window Defog.)

The wiring you mention is fed directly from the Ignition Switch BEFORE the Fuse Box AND the Accessory Relay.

Now, try reconciling that with later diagrams and you can see why this can be very frustrating.

2¢

E