thanks Mike and John. I have taken a volt meter and measured the voltage at the converter on the battery side and it measured 12.5 volts. I then measured the voltage on the converter and it measured 14.44 volts. If there is power on the battery side of the DC circuit board would this mean there is no cutoff switch or solenoid between the converter and the battery. Also, why when the battery disconnected and the TC is plugged into shore power the converter does not provide power to the 12v DC circuit?