what gauge wiring does the JC charger system have?

[pjstock]

in trying to decide whether to replace the 12V Aux battery charger (from 230V to a 120V unit) it seems important to know if the wiring in that system is heavy enough gauge to handled the extra amperage that a 120V supply would contribute.

does anyone know the gauge of wire in that electrical system?
I guess between the external Input plug and the charger.

or whether it is heavy enough to handle 120V supply?

Is there a wiring diagram of that system?