Right or wrong, this is how installed them. Works for me.
I installed the XS400 inverter and Trimetric meter that I previously mentioned. It involved mounted two extension cords (one forward to feed the tv and one reversed to feed the transfer switch in the inverter) and two small wires about like phone cable. One phone cable (4 wires) connects the Trimetric meter to the batteries and the other phone cable connects the inverter and remote.
Here are those wrapped with electrical tape.
The 1/8 stiff wires laying under the medal clamps in the packages were wrapped the length of the wires to stiffen them so they would not sag when bolted along the frame with the clamps. After a total of 4 wraps with electrical tape the cables were attached to the frame with the clamps.
This is the "shunt" that in used in the negative battery cable for the Trimetric meter. One of the phone type cables lead (it contains one white, 2black, and one red cable) from the shunt to the Trimetric meter.
This is the fuse that goes in the positive battery cable.
Here is the "shunt" installed. I needed containers to keep everything dry so I used "loaf pans" from the kitchen department of Wal-Mart and cut down a cookie sheet for the top.
This is the fuse installed. The covers will be bolted on the top and everything painted black to blend in.
This is the inverter (an inverter takes 12 volts in and gives 120volt out). The 2 white plugs on the front are the 120volt outlets. One of the two extension cords will plug in and run our tv and satellite receiver, the other will power our laptops, printer, and router.
The black cord plugs into a wall socket and feeds the inverter transfer switch when the camper is plugged in or we are using our generator. The inverters uses regular 120volt power when available and automatic switches to battery power when needed. No need to move the wires from one plug to another.
This is the back of the inverter and show the 12 volt battery lugs (red=positive and black=negative. The small silver lug is a ground for wire for the inverter case.
Here is the inverter installed in a front compartment. The extension cord with the black end is for the tv and the other with the yellow end is for the laptops.
This is the Trimetric meter (showing our batteries are 91% charged) and the remote switch for the Xantrex inverter.