Bob wrote:

Anybody know of a reasonably priced gadget that will let me monitor the
MAIN bus feeding the cigarette lighter?

If you connect a third voltmeter, you will now have three different
readings. Which are you going to believe? It like wearing three watches,
which one is "closest" to the correct time?

The only thing that really matters is what is the voltage at the battery
terminals. If your batteries are lasting more than three years, and as
long as the starter consistently cranks, then the voltage cant be
too far off.

If you are not consistanly adding water to the battery, then your bus
voltage is not too high.

If your starter is not laboring, and your airplane starts consistantly,
then your bus voltage is not too low.

The "acid test" (pun intended) is to check the Specific Gravity of the
battery with a hydrometer.

MikeM
Skylane '1MM
Pacer '00Z