I just tested my relays and come to find out they are both bad. I went to parts store and picked up relays to 1980 Ford Truck look identical to ours i heard of them working on our truck somewhere on these forums. My question is how do you wire them? Where do the two small wires go and where do the big ones go? I bought the same one in the picture ill number them 1,2,3,4 terminals left to right if any one wants to help. thanks!! Click to enlarge

 

Just like the ones on your truck. Should be #4 to battery #3 small wire thats hot when heater grids should come on. #2 small ground #1 to heater grid. the wires should plug and bolt right on. I can make sure in the AM.

 

thanks a lot yea if you could check that for me that would be awesome im going to do it tonight. Also the small power wire is that 12v? i also heard that the big ones and the small ones are interchangable?