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Yes, a fuse would be a great idea should this be more permanent. The wires do not get warm at all when cranking, I checked to make sure. The three batteries share the load, so the amperage is divided by three. The wire, which is only 14 gauge is more than enough according to charts I've seen online that say 14 gauge is good for 32A. That means I can easily pump out 100A, and I'm sure more for shorter durations. The alternator can only supply 60A, so I'm more than safe there.
Blueflame, you are right about the voltage. I did some digging on battery voltages and found out that you can in fact go much lower than I had expected. ~10.5V seems to be the recommended lowest you should go with a battery under load. I've not even touched 11.0, so I will probably end up removing the extra batteries sooner than later. I'll be a bit more aggressive with my EOC next time I drive the car and see what happens.
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