Hi,
Yeah, that's correct, 3 red wires to one motor, and 3 black to the other. The ESC has probably 3 wires with different colors for the motor, but it does not matter which wire goes where, as long as the e.g 3 red wires are hooked up to the same ESC. See link to wiring diagram. That's for the new 360L excavator, but same setup concerning the track motors (or 'walk motors' as they've been called also)
Not quite sure what went wrong since ESC's has been burned, but hopefully things will sort out when you have a look at the diagram?
http://www.rc4wd.co.uk/product/VV-JD00016-21.jpg