Hello, you did some good testing. There should be 2 hot terminals at the relay, key on, heater controls activated. The voltage for the load side of relay is hot all the time. The voltage for the control side of relay comes from the hvac fuse 10 amp, that fuse circuit goes hot when you turn on the key. Did you check for voltage at the fuse circuit, key on? Then that circuit goes through the hvac controls.
Sunday, August 2nd, 2009 AT 8:50 AM