Installing new wiring harness for heater blower motor and dash switch in my 68 C10

[HeavyHauler]

Yes this is a big help. I am just going to run a 14 gauge fused wire from the unfused ignition terminal at the fuse box back to the heater control switch on the dash. I am going to run the same size of fuse that is labeled heater at thef fuse box.

I was going to unbolt the fuse box from inside the cab and run the brown power wire from the factory location but my luck would be there is something broke back there and that is why the other PO never used it. LOL! It will be more accessible if I just run a brown power wire from the front of the fuse panel anyways.

I am also going to check and see when those unfused ignition terminals get power when I turn on the key.

Thanks again!