i need help i blew my ecu 2 times already i checked everything dont know wat else it could be besides wiring harness n how would i know if its the harness...also the ecu was a p75 i bought a pr4 n didnt work does it have to be a p75 to work i thought any ls ecu would have worked .......let me know thanks....also the radiator fan im only running with one i had to take the conderser fan off because of my manifold for turbo now would the other fan work fine or does the conderser fan need to be plugged up for it to work(stupid question i jus didnt know)

 

Check the power going into the ECU (can't remember which wire it is off the top of my head right now). It should read 12 volts.