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that mean's you have a parisitic current draw somewhere in the gun and it's a big one too (heat means lots of draw). the only place where exposed wiring has contact points is at the battery terminal connections and at the motor. the switch has both "+" connections, so it's not likely there. you may have chafed insulation where the wiring routes in/thru the mechbox and causing the "+" conductor to make contact with the "-" conductor. this would also cause your problem. carefully inspect all your visible wiring to see if the insulation is intact with no cuts or exposed conductors. if everything is ok then your problem must be internal. as your motor attempts to turn (the clicking sound you hear) your problem is not likely there as your motor is getting some voltage. if the short was there your motor would get nothing. as for an internal problem, have someone with some experience look at it for you.
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