that breaker isn't toyota, so it likely is part of the aug. battery charging.
if the coach battery is dead your stuff won't work, but it's hard to say if the bad breaker is the only culprit
looks to be the ignitor wires going to the computer. cut out the bad part and replace with similar wiring. be sure to enclose it in a sheath to prevent it from reoccurring
if your cooling system has been properly maintained there is no reason to replace your radiator. regular flushing and coolant replacement will keep the system up to spec indefinitely