All the answers to your questions are in the instruction book, which should have been provided with the IBC. If you havent got one, it is available on the manufacturers here - http://www.robowars.org/docs/ibc-docs-v0.1.pdfhttp://www.robowars.org/docs/ibc-docs-v0.1.pdf

From the manual:
quote:

#1 = +12v - This pin will provide a stable 12v output from the switch-mode regulator, regardless of
the battery input voltage. Do not attach devices that use more than 300ma. Small relays and
remote-power LED€™s (with a suitable resistor) can be powered from here.
#2 = AUX High - An €œOpen Collector to Ground€ output that will activate [internally connect to
ground (-)] when the €œAUX1€ Servo input Joystick is more than 30% €œForward€. This output can be
used to ground one side of a relay-coil to trigger weapons. The maximum current is 300ma. Use an
intermediate relay if you require more current than this.
#3 = AUX Low - The same as AUX High, but activates when the AUX1 input is more than 30%
€œbackwards€
#4 = +5v - This pin provides a regulated 5v output from the onboard 5v regulator, regardless of
battery voltage. Do not attach hi-current devices to this pin. Suitable for small relays or LED€™s (with a
suitable resistor) only.
#5 = FLIP Input - an input that tells the controller to reverse its direction and steering controls if
the robot is turned upside down. This can either be connected to a tilt-switch that grounds the input
when the bot is inverted, or to either of the AUX High or Aux Low outputs for remote control of the flip
function from the radio transmitter (if the 3 rd channel is not required for weapons). Do not exceed 5v
on this input. FLIP is active when grounded (0v).
#6 = Ground (Gnd) - Earth return point and ground reference for the Aux and FLIP inputs and
Outputs. This should be used for any auxiliary connections rather than relying on the main power
earth, since heavy current surges through the main cables can cause voltage fluctuations on the
main earth point.

A 60A fuse is a fair precaution, though a smaller one may be an option, depending on what youre running off it.