I have a 2005 Isuzu NQR box truck. The two batteries are connected together. The batteries are low because I have to jump-start to get it going. I bought a PEAK 2-amp battery charger that auto-senses when the battery is fully charged and switches to trickle. The problem is that the charger thinks that the batteries are fully charged because there are 2 batteries... so it doesn't charge... just trickles. How can I charge these two batteries without removing them from the truck? Can I use a dual-bank charger (like a Deltran Battery Tender) and connect each battery to a seperate bank of the charger or will this not work because the two batteries are wired together? I read somewhere that there could be a "bridge switch" on the cable connecting the two batteries that I could flip to set the 2 batteries into parallel wiring... couldn't find such a switch. Can anyone help? I'm sure someone has had a need to charge a dual-battery setup on a truck/boat/RV? Thanks in advance!