Some answers:
1) with the original wiring, the white wire connected to one side of a shunt, which created a small voltage drop for monitoring the current flowing in or out of the battery. If you're not using a shunt (you don't want/need the amp meter in the panel to work), connect the white wire directly to the battery ground.
2) The blue charge wire from the car should connect through a fuse on the panel (20A is typical) to the DC + buss in the panel. The fuse is critical, since it prevents disaster if the car/trailer wiring shorts to ground.
3) You should use a fuse or circuit breaker rated for whatever wire size you used (typically 40-50A) as close to the battery as practical.
Remember, the battery will provide virtually unlimited (well, unlimited compared to the capability of the wiring) current. You want all the wiring to be protected in case something goes wrong. In this case, limiting the total current from (or into) the battery to 50A protects the battery wires, fuse panel and Intellipower wires (in case they ground between the panel and the Intellipower).
- Bart
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