On the last 30 mile leg home from Texas to Edmonton. Notice ammeter showed 10 volts. Engine responding ok but felt a little underpowered. House batteries showed 17 volts. Kept going when home opened the chassis battery compartment and wow vapor and hot batteries. Washed and refilled batteries and the n starting looking for a solution. Isolator showed little bit of melting on the resin...figure thats he culprit will replace today and update. Dont think I saved the batteries but they are taking a charge when plugged in to shore power. Ah the fun or RV'ing.