[Al Skierkiewicz]

Max,
The 2-14 suggests this connector is rated to be used with #2 to #14 wire. Again, that is for solid conductors in most cases. Since the connection is loose, there is significant resistance across the connector. As you start to draw current through the connection, there will be a voltage drop across the connector. If we assume that the connection is about 0.01 ohm. Then for every 100 amps, there will be a 1 volt drop. (V=I*R) That resistance is also real so it will dissipate power (P=I^2 * R). So for every 100 amps, you will see 100 watts, pretty much the same heat as a 100 watt light bulb. Considering that a CIM draws 131 amps at stall (start) or that the battery can deliver 600 amps fully charged, you could be talking several hundred watts being developed in that small connector. I am surprised the main breaker didn't trip just from the heat conducted by the connector.