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6. Apply a light coat of grease on all battery posts and
cable connectors to reduce corrosion after connections
are made.
7. Connect a digital multimeter (set to amps) between
the negative battery post and the negative (ground)
cable connector. The reading should be less than 0.1
amp. If the reading is 0.1 amp or more, the unit’s electri-
cal system should be tested and repaired.
8. Connect the negative (ground) cable connector to
the negative battery post.
Charging
To minimize possible damage to the battery and allow
the battery to be fully charged, the slow charging meth-
od is presented here. This charging method can be ac-
complished with a constant current battery charger
which is available in most shops.
Battery
Battery Charge Level
Reserve
(Percent of Fully Charged)
Capacity
Capacity
(Minutes)
75% 50% 25% 0%
80 or less 3.8 hrs 7.5 hrs 11.3 hrs 15 hrs
@ @ @ @
3 amps 3 amps 3 amps 3 amps
81 to 125 5.3 hrs 10.5 hrs 15.8 hrs 21 hrs
@ @ @ @
4 amps 4 amps 4 amps 4 amps
126 to 5.5 hrs 11 hrs 16.5 hrs 22 hrs
170 @ @ @ @
5 amps 5 amps 5 amps 5 amps
171 to 5.8 hrs 11.5 hrs 17.3 hrs 23 hrs
250 @ @ @ @
6 amps 6 amps 6 amps 6 amps
above 6 hrs 12 hrs 18 hrs 24 hrs
250 @ @ @ @
10 amps 10 amps 10 amps 10 amps
CAUTION
Follow the manufacturer’s instructions when us-
ing a battery charger.
CAUTION
60_F (15.5_
Charge the battery in a well–ventilated place to
dissipate gases produced from charging. These
Nausea may result if the gases are inhaled. Un-
plug the charger from the electrical outlet before
from the battery posts.
Do not charge a frozen battery because it can ex-
plode and cause injury. Let the battery warm to
C) before connecting to a charger.
gases are explosive; keep open flame and elec-
trical spark away from the battery. Do not smoke.
connecting or disconnecting the charger leads
3. Following the manufacturer’s instructions, con-
nect the charger cables to the battery. Make sure a good
connection is made.
4. Charge the battery following the manufacturer’s
instructions.
5. Occasionally check the temperature of the battery
electrolyte. If the temperature exceeds 125_F (51.6_C)
or the electrolyte is violently gassing or spewing, the
charging rate must be lowered or temporarily stopped.
6. Three hours prior to the end of the charging, mea-
sure the specific gravity of a battery cell once per hour.
The battery is fully charged when the cells are gassing
freely at a low charging rate and there is less than a
0.003 change in specific gravity for three consecutive
readings.
Battery Charge
Level
Specific
Gravity
Open Circuit
Voltage
100% 1.265 12.68
75% 1.225 12.45
50% 1.190 12.24
25% 1.155 12.06
0% 1.120 11.89
Note: Using specific gravity of the battery cells is the
most accurate method of determining battery condition.
1. Determine the battery charge level from either its
open specific gravity or circuit voltage.
2. Determine the charging time and rate using the
manufacturer’s battery charger instructions or the
following table.
Electrical
System
Groundsmaster 3000/3000–D
Page 6 – 39
Electrical System