93 ranger custom door locks, wiring?

The reason is that you have two switches which are wired in parallel. Remember with these switches when not used the grounds are connected to both motor wires. Thus when you actuate one, you're connecting your centre live to either the blue or green and the ground (black)stays in contact with the other colour, unfortunately the other switch still has the both motor wires connected to ground = dead short = fuse blow. I know you don't understand it's quite hard and I'm not going to write a whole page on switching permanent motor magnets, suffice here are your options. a)Revert to one switch. b)If the switches have five contacts in a straight line, 1) Pull the motor wires away from the switches and wire them directly to either the 451 or 2 relays, whatever you used. In the relay section you will have a diagram showing how to wire "add actuators" use that as a reference. 2) Remove the 12V+ feeds from the centre of each switch and discard. Now remove the two grounds from each switch discard one and connect the other to the centre terminal where your power supply was before. 3) On the outer terminals run a lead from one side to the green coming from the alarm the other side to the blue, i.e. the lock/unlock wires from the alarm before the 451 or relays. So; each switch is now configured thus: 5 terminals, top to bottom (1)lock wire from alarm, (2)empty (3)ground (4)empty (5) unlock wire from alarm. This will now work for you.Test before boxing up.