These next two pix show the mounting for the radios. The large unit on the left is the 480HX, and the small
unit back under the seat on the right is the TMV7. Both units are mounted under the rear seat. This is a crew
cab configuration with a rear seat. Don't know where I would have put the radios if I didn't have that rear seat!
This is a close-up of the 480HX.   There are four #12's feeding the two power circuits
to the 480HX. The radio goes into a receive-only mode if it sees only one power
feed. The bundle of wires has been covered by split loom after this photo was taken.