I have an air and train horn system in my truck. The compressor is mounted in the rear topper. The viair unit is controlled via an electronic relay and that is controlled by a pressure switch on the control side. The control side is fused for 5 amps and the load side is fused for 40 amps both inline. Today the compressor did not kick in as usual. I checked the fuses (both good) and the relay. I found a melted connector on the relay. I did some research that said an overload or an overvoltage could be the cause. Well the compressor works fine, the pressure switch works fine, and the fuses are both fine. It was also a 40 amp rated relay. The compressor I believe draws around 30 amps. I am not sure what happened. When I removed the fuse and reinstalled I could hear the relay half clicking. I installed an american made relay and threw away the one I had from China. Any suggestions?