Originally Posted by used2005santafe
Thanks Paul... But based on the problem I described in my previous post, any idea what could be causing my failure? Please try to describe in as much detail as possible, thanks!
Check if you do have a ground line at the switch itself. If that's lost it cannot work on any setting.
Maybe the motor itself is stuck or burnt or lost contact with the (even new) switch.
The highest speed setting does not use the resistor at all, as mentioned, a direct ground to the motor then.
Because it is not running at highest speed I would check voltages at the motor itself (or wiring going to it). Another thing, do check the fuse, but I suppose you've done that already.
A stationary 12 volts should be at the motor, switched grounds on the other side.
I don't know if all the switch lines are connected via a lug at the resistor, also for highest speed, but I suppose so.
You can put a grounding wire direct at the motor at it's switched connection (of course not at the 12 volts line, it will blow your fuse).
It should start running then.
It cannot damage anything (like switch or resistor) because they should deliver a ground. If not running, the motor itself is at fault or stuck.
Also measure the switched line.
At highest setting of the switch it should deliver a ground, on other settings a not to high resistance to ground (getting higher at lower speed setting).