I have a `94 s-10 Blazer 4-door Tahoe LT. The left rear power door lock quit working and I was so sure that it was the door lock solenoid that I went to the bone yard and pulled one. ( I know, I know, I did not want to pull the door panel twice.) When I put it on it still did not work so I checked the power and sure enough, no power to the solenoid. The right side works fine. I was wondering if someone else had this same problem and where you found your power break at? Thanks.

 

Check the ground on the harness at the motor...or check the switch for corrosion.
I once had to re ground a door solenoid...original had a break in the wire

 

OK. Here is a long overdue update. I pulled the inner panel on the door post ( this is where the door wireing harness pluges in ) and found that I had power going to the door. So I ran an Ohmes test back thru both wires for the door lock ( the gray wire and the biege wire ) and found that I had a break in the biege wire. Now all I have to do is replace/bypass that wire and that should fix the problem. I hope this helps someone.