[Dingfodgy]

Two terminal relays? Metal Cube? Are these horn relays? Definately sounds like the wrong components are being used. There are several write-ups on this subject. Just go to your local napa grab two 30amp 4-pole relays (Bosch, GE, Sylvania, Delco- it don't matter, 12v is 12v). Make sure to also put in a 20a inline fuse on the power wire from the battery- it's cheap insurance.