Thanks for pointing out that the connection between the battery to the
dashboard voltmeter may have too much resistance. I will check the
voltage at the terminals of the dashboard voltmeter to see if it is
reading the same low voltage as the voltmeter. If this is the case,
this means I definitely need to do something about the wiring in this
boat that I intend to do anyway when the weather becomes warmer.

Last night I tried to check the voltage at the terminals of the
voltmeter. But I was totally confused by the various wiring at the
voltmeter. I think I will check it again _after_ I have documented all
the wiring in the boat. By that time, I will understand the wiring at
the voltmeter better. For now, I just have to continue using the
multmeter to check the voltage of the batteries instead of relying on
the voltmeter on the dashboard.

Jay Chan