door locks quit working after changing heater core....help!!

I installed a new heater core over the weekend and now the power locks don't work, I unhooked the wiring under the pass. side kick panel and re-hooked everything I think, I do have an alarm system which connects under the drivers side kick panel and I could have damaged a wire there also since that kick panel was off too but the alarm works fine, it just won't work the door locks now. I have a wiring diagram but dont know the best way to start checking the wiring, should I go from the switch on one door to the other or is there a better way? Any recommendations would be appreciated, I have a digital volt/ohm meter but am not the best with electrical issues. I did try swapping out the 20A circuit breaker in the fuse panel but havent dont anything else other than look for a broken wire or loose connection with no luck, anyone had this happen to them before ?

Mustang5L5 said:

There's a small wiring harness that runs along the firewall top from the drivers side to the pass side. Check to see that it is plugged in on both side. It's a small gray connector on each side.

Would help to know what year as the wiring did change depending on teh year

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Car is a 1990 GT, what does the connector look like and how many wires and what color wires would be in it? I just put a 347 in it and must have damaged the heater core during the swap, everything else works as it should other than the power locks. I have heat now and still am working on the break in oil and just want to enjoy the car with everything working.