1. It takes voltage to latch and unlatch the Intellitec solenoid
2. Intellitec solenoids are "latching" which means NO power is consumed once they latch or unlatch
3. IF the system worked before you replaced the batteries then you missed a wire or cable somewhere. I would be a rich man if every customer gave me $100 for every time they state they connected all the cables and correctly. They come in and I find that one cable not connected or connected wrong.
4. Have you checked the 5 amp fuses on the Solenoids? There are 2 solenoids---Chassis and Coach. Each has 2-5amp fuses.
5. They will operate down to about 11.2 volts so voltage is not your problem.
6. "I read somewhere that 12.8 volts are required to keep them latched". No they do not need voltage to stay latched. see item 2 above. Doug
