Need help with wiring issue

[ScottH]

Just picked up a 87 V10 and trying to figure out why the blower motor wont work. I did some testing & the motor is good, relay was just replaced, resistor looks good. The problem is I am not getting power to any of the above. Pulled the dash switch and swapped with another used one I had, same thing, nothing. Tested for power on all four leads of the switch plug & nothing. Changed out both the Heater & AC fuses, still nothing.

Can anyone tell me where the power to the switch comes from? In the wiring diagrams it appears to be from a BRN wire which originates from the fuse box. Also one diagram indicated there was an inline fuse on this wire.

If anyone has any suggestions or could shed some light on this I would appreciate the help. BTW not sure if it makes a difference but it equipped with AC.

Thanks
Scott