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4-4
Voltage Drop Testing
The battery pack contains four 6-volt, deep-cycle lead-
acid
fl
ooded-type batteries connected in series to
produce a 24vdc “pack.” 4-gauge copper cables are used
to connect the pack and furnish power through the main
breaker switch to the main distribution buss.
Use the voltage drop test to check the battery-terminal-
to-cable-end and battery-pack-to-breaker-switch for
excessive resistance. The voltage drop should be very
small on this type of large-wire, short-run connection.
Typical readings would be .008 to .030. Any reading of
.200 or higher indicates severe resistance problems in
the circut section being tested.
From the post/buss distribution block, power
fl
ows in
from the charge circut and out to all load devices, as well
as the volt meter system monitor located on the back of
the boat top near the vent access cover.
Note: All power in or out
fl
ows through the breaker. If
the volt meter reading is indicating zero, make sure the
switch is “ON”.
The charge system lead is a 15’ long, 10-gauge cable
connected to the post/buss. The SB-120 connector on
the cable end mates with the SB-120 connector on the
charger lead. This lead and connector receives a high
degree of punishment and wear. Use the voltage drop
test across the connector while the charger is on to
determine the resistance of the connection.
A reading of .200 volts or above indicates that repair to
the connection is required.
NOTICE:
The terminal ends of the SB-120 connector can
be unloaded from the connector and repaired/replaced.
During reinstallation, make sure the wires are properly
loaded in the connector. The black wire from the charger
cable goes to the black wire from the charger. If these
are reversed, it will “blow” the output fuse in the charger.
Po
st
Co
nn
ec
to
r
Te
rm
ina
l
back of Breaker