Hi. I'm new to RVing and new to this site. I'm in the process of swapping out a suspect power conveter on my 2002 Coleman Utah pop up. I've replaced the old Centurion 3000 with a WFCO 8735P. Everything works fine on 110 V AC shore power, but when I go to battery only, nothing. I checked the battery, and it's producing 12.49 volts at the lugs. I checked for shorts to ground on the black 10 gauge wire from the battery to the convert, and found none. Any thoughts? Karl