FC1ant
Junior Member
i was digging through the dash to swap my heater only box with a heat/ac unit from a 91. i found a relay? its not on any diagram for my year of truck that i can find. The questions are what is it and do i need it? the truck runs without it. it has only 4 wires and what looks like a battery backup?
4363011
1 1505
emr 7902
4363011
1 1505
emr 7902