I've been putting this thing together for a while now. I have yet to mount this in my Jeep, soon though. Waiting on a warm day. No heater in my garage. Basically, I plan to mount this behind the drivers seat or passenger seat, between the wheel well and the roll bar. Then I'll have my switches mounted either on the A pillar or use the daystar lower dash panel. It's all wired except for the master switch, which just allows power to all the relays. After that, all I need to do is wire whatever I'm hooking in right to the terminal board I have inside this box. What do you think?

 

Do you plan to install a fuse or circuit breaker on the positive lead near the battery?
(edit to add: The fuse/breaker rating is determined by the wire size and length. Not by total value of fuses in the box.)

Compare your schematic to this diagram.

 

Very orginized install. But like Ron said, you need a primary fuse. Also, if I can offer one more suggestion, I't isn't necessary to "Switch" the distribution power for the relays. You can accomplish the same thing by using an accessory circuit for control power.

 

Very nice work. X3 on the primary fuse or circuit breaker. You can get one for a reasonable price at AutoZone or Advance. I saw one the other day that was a 150-amp breaker and I think it was $25 or something like that.

 

The primary fuse or breaker has to be rated to protect the wire, based on wire size and length.

 

Or total load. As long as the total load is less then the rateing of the wire.

 

Yes. But no need to limit the fuse to total load if the wire can handle more.
I mentioned it because a lot of people don't associate a fuse with protection of the wire it's in series with.

To take it a little further, the fuses in the box must be rated to protect the wires to the accessories, which must be large enough to safely carry the accessory load.

 

Acceptable. This "Distance vs Wire Size" still has me confused. But it is possible to have a need to oversize the conductor to maintain the load rateing. Thus - "Fuse to load with ample wire rateing".

 

That will keep things safe. The installer has to know what "ample wire rating" is.

 

Aggread.
Ample wire rating = ( 1st ) Total load applied + ( 2nd ) consideration for distance.

This determines fuse size!

If the distance of the circuit requires the installer to increase the wire size, increasing the fuse size at the same time would be unacceptable.