Air Blower in engine bay - I've run out of ideas

[PFNog]

I have a 1987 Carrera with the auto heat knob and the two red heater levers between the seats. The blower motor had been running whenever key was on (regardless of lever position)– it had been that way since I bought the car 3 years ago – I actually thought it was supposed to be that way, until recently.

Last week the blower started making a lot of noise, so I took it apart and the motor had chewed up the front bushing, so the shaft was wobbling badly and the squirrel cage was rubbing and making the noise. I got a new high-temp bronze bushing seated it in the housing, slapped it all back together and everything was good. Motor was quiet and running like before – always.

I figured the motor wore prematurely because of the “constant-on” condition, so I searched on here for why, and went into the controls between the seats to fix the little switch in there. I fiddled around with it a bit and got the motor to no longer run whenever the key is on.

The problem is – now the motor doesn’t run at all! Never! The footwell blowers do run as they should, when I turn on the dash switch. I tried turning the auto heat up, I tried bypassing the switch altogether, but nothing works. I checked the fuses in the engine bay and they are all good. I checked and there is no power going to the blower motor now when the switch is ‘on’. I’ve not messed with the relay at all, but figure it ran before so that shouldn’t be a factor.
Any ideas?

[PFNog]

Came up with another idea over night...
I got to thinking there must be a break in one of the two wires that run to the switch and that I may have disturbed it enough to have broken the circuit. I removed the passenger seat and went looking for it. Didn’t have to go far, about 2” toward the rear, under the carpet it looks like someone had tightened down a bracket right on top of the little yellow wires and crushed them badly. Seems like my fiddling with the switch dislodged one from the pinch – the pinch was clearly the cause of the ‘always on’ blower and the subsequent disconnect.
Spliced in some new wires - problem solved!

[Quasimoto]

Good sleuthing, and a potential incident averted...top bombing!

[GH85Carrera]

That is the dictionary definition of a short!

[PFNog]

Yep, fortunately the two wires that shorted led to the same switch, so instead of trouble it just created an “always on” condition- very lucky - and the reason no fuses blew.