The fuse panel in this GTO has the 2nd position on LH side as the heater fuse. It looks similar to what is posted above but not exact. I've found and printed some wiring diagrams. There are a couple of wires connected to the accessory taps.
However this is what I figured out today:
I was tracing the under dash wiring and figured I should check the two plugs that connect to the climate slide switches. I unplugged them, including one that I could see the butt end, but not the connection. With them unplugged the fuse did not blow.
Is this true, lets try again. Sure 'nuf no fuse blowing.
I plugged one connector in and the fuse held. I plugged in the other and the fuse held. What's going on here?
I noticed when I plugged in the two prong connector that is somewhat hidden, feeling the blades to ensure it is plugged in correctly, it seemed to be differently aligned from when I had removed it. I believe a previous owner plugged to only one leg and shorted out the system.
So now the fuse is holding but the fan still does not work. I had noticed earlier that the fan speed switch has a 3 prong connector attached but a 4th prong is not connected. Using the multimeter I determined that 4th prong is the hot line in and the current goes to the other 3 lines depending on position of the switch. Using a jumper to bridge it to an accessory tap the fan motor ran through the 3 speeds. Yes! I'm getting somewhere!
So I now have to figure out which wire feeds the switch hot prong, tidy up the wiring under the dash and move to the next concerns. Sounds simple but there is wiring under there with no obvious connection and there is a large group attached together that may feed the gauge lights. And the horn still does not work.
I just ate supper that included collards and black eyed peas and maybe my luck is changing.
I'm doing this in my spare time and he's making it worth it.
Thank you Everett and Jim.