does converter charge truck batteries

This is a late reply, but I thought it might help out those Tioga 31m owners, and maybe a few other Tioga models. On my 2008 Tioga 31, which is really a 2007, the Bi-directional Isolator Relay Delay is under the top step, next to the double set of house batteries. I learned that my BIRD works perfectly. My house and chassis batteries get charged at the same time, whether on shore power, on generator, or engine.