Cheap China relay fails. First relay lasted 3 times then their replacement relay failed after 4 times.
Went to electronics store and got one that is probably made in the UsA and it still is working. The relays they furnish with the Air Horns is not rated enough to handle the compressor for very long. 50 and 70 amp 12 Volt relays are available on lone for a little more . The store took the replacement relay right out of another air horn kit pack.
Don't expect the relay that Harbor Freight furnished with the kit to last more than a few times. Save the aggrivation.
Reason of review: Bad quality.
Monetary Loss: $15.
Preferred solution: Let the company propose a solution.