Re: Lost all DC power
Are the batteries fully charged? Losing a ground does not leave you with 3.4 volts. It leaves you with ZERO. Losing +12 volts does not leave you with 3.4 volts -- it leaves you with ZERO. Losing +12 volts, ground, or a dead battery can cause loss of power. If setting the switch to BOTH doesn't bnring power back, the connection to the COM terminal is bad or the switch itself is bad (although highly unlikely) or either or both batteries are dead or dying. Use a voltmeter and start at the battery. If you have 12 volts there go to BAT 1 on the switch. 12 volts there repeat for BAT 2. If ok INTO the switch, check voltage on the COM terminal in all three postions BAT 1, BAT 2 and BOTH. In otherwords, follow the voltage. When you lose it you found the problem. Remember also that just because a battery measures 12.6 volts with nothing running does not mean its a good battery. Add a load and they can drop to zero or near zero.
