Dingy battery power wire

AL65 wrote:
I am a bit concerned about connecting up a battery charge wire on our CR-V.
I have installed a battery line from a 2001 Chev 23 foot Class C to my 2007 Honda CR-V.
The 10 gauge line from the coach (+) battery terminal, connected via a 20 amp circuit breaker, goes to the CR-V (+) battery terminal. The CR-V battery is also protected by a 20 amp circuit breaker.
I have a removable section at the hitch to join both ends of this (+) wire.
Note: I have installed separate brake/signal bulbs installed in the tail lamp housings on the CR-V that connect via the 6 pin trailer plug.
My questions are:
- do I need to install a (-) 10 gauge wire from the CR-V to the coach? If so, can I just run it from the CR-V (-) battery terminal to a clean connection on the frame at the rear of the coach or do I need to go right to the (-) battery terminal on the coach battery?
- should I disconnect the power wire when the CR-V is parked for the night or for an extended time of several hours?

I plan on installing the Stay-In-play DUO as the CR-V brake system.

Thank you for any suggestions/help.
Ray

First, #12awg is sufficient for carrying 20amps, but having the #10 is better against the voltage drops that might occur with the longer runs. For the negative ground portion of the circuit, what's in the connector already and the metal connections of the hitch itself should be sufficient. As for disconnecting, it would be good insurance against voltage transfers to a battery going bad.