Heater resistor?

You can temporarily bypass the resister.

But if the fan does not work in low or high I doubt the resister is the issue

There is a long ground wire that runs over to the right kick panel area. Without it and some other grounds you are not going to have a fan.

Also is there any draw on the system (ammeter) when the switch is turned firm off to low ot high?

Lastly you have the ignition key in the run or acc position when testing, correct?