[VAC] Re: Why Car & Trailer Battery to Univolt?

[Jim Dunmyer <jdunmyer@xxxxxxxxxxx>]

Lan,
 Connect the new converter to just the trailer battery. Actually, there
is usually a "Power" wire coming from the tow vehicle to charge the
trailer battery while on the road. To use it, you need an isolator,
either diode-style or a relay to prevent running down the vehicle's
battery by using too many lights in the trailer while the tow vehicle is
plugged in. That "Power" wire (and associated ground wire) is too light
to do much charging, I've measured it at only 4 or 5 amps.

                                     <<Jim>>