Broken ecu
 

I'm an ASE Master mechanic with a degree in Electrical engineering from WMU, I'm angry and stumped. There's a 91' camry in our shop that I've been trying to make run again, but every Ecu I put into it seems to fry only the 5v system. There seems to be good specs on all the components and the wiring shows no unusual + or -, or conductivivity in to any other wire or system that shouldn't be. I don't really have the time to go through the car as thouroughly as I should.
So I'm looking for the number of some toyota expert who's been in the biz for 20+ years or something to lead me in the right direction.