Replaced the Coolant temp sensor. checked all 3 relays, what I found is to the relays I am getting positive but not neg, I can ground to the frame and get voltage, but going off batt pos and relay neg I get nothing, going just relay I get nothing. So power is making it to the relays. I checked wire harnesses and all seemed good to go. Not sure where to check for the ground. Anyone have any insight?