My name is ***** ***** I will assist you.
I'm going to presume you have the driver seat that has the little pump under the truck with the hoses that go up to the air bad and bladder in the seat?
Does the seat pump run all the time? I test it buy putting a lot of weight in the driver seat and air all the way up, then squirt the air line with soapy water. If any leaks in the line, it will cause that motor to run all the time and burn that relay up. Another cause ifs the motor itself. The motor gets worn with age and cause the relays to literally melt. It is a bad brush in the motor that does it.
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