The wiring schematic for the 71 fuse block shows a 20amp accessory post. There is open fuse location but only a clip for one end of the fuse. It has switched key-on 12 volts. I need a 5amp switched power source and need to make sure I am not overloading the wiring harness. Any one else using this location? If so did you utilize the existing fuse clip or wire in an inline fuse?