CHAPTER 6
ELECTRICAL SYSTEM
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34z
DO NOT LEAVE THE INVERT SWITCH “ON” ON THE MICC PANEL ALONG
WITH THE INVERTER/CHARGE SWITCH “ON” ON THE AC PANEL IF YOU ARE NOT
INVERTING AS THIS MAY DRAW 10-12 AMPS EVEN IF NO AC DEVICE IS TURNED ON. OR,
YOU MAY END UP WITH DEAD BATTERIES (All of them if the Parallel Switch is “ON” too.)
6.5 REVERSE
POLARITY
As a safety precaution, your AC panel is fitted with reverse polarity indicators. If
an AC supply were wired incorrectly, either aboard your boat or shoreside, a dangerous shock
situation could exist. Normally, the reverse polarity lights should not be illuminated. If they are,
disconnect that source of power and alert the appropriate person.
6.6
ELECTROLYSIS & GALVANIC CORROSION
Metallic fittings that are exposed to saltwater are subject to electrolysis and galvanic corrosion. To
minimize potential damage, your boat is fitted with a sacrificial zinc at the transom. This zinc is
connected to the bonding system of your boat. It should be visually inspected whenever possible
and replaced when 1/2 of the zinc has been eroded. Pay special attention to its condition when in
new waters and marinas, as environmental conditions affect the rate of deterioration. If the zinc
erodes rapidly, current meters can be used to assess possible causes and remedies. See the
Cummins Engine Operator Manual (EOM) for sacrificial anode location and inspection on the
engine as well as the drives.
6.7 BONDING
The bonding system of your boat connects all underwater metallic fittings to the sacrificial zinc
and the boat’s negative bus bar. In order for the zinc to protect an underwater part, the
connection must be clean and secure. The green wires that make up this system are not normally
current carrying.
6.8
ELECTRICAL
SAFETY
