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BATTERY REPLACEMENT
See Figure 2
REMOVING OLD BATTERIES:
1. Open box lid.
2. Disconnect cables and wiring from batteries.
3. Loosen hold-down by removing 1/4–20 bolt on end of box, by vehicle harness. This will allow hold-down
to pivot up.
4. Lift and remove old batteries.
INSTALLING NEW BATTERIES
1. With hold-down pivoted up, place 3 new batteries with negative terminals against back of case.
2. Pivot hold-down onto batteries and secure with 1/4–20 bolt.
3. Order of Connection for cables and wiring.
a) To #3 Battery (battery furthest from chargers) NEG Terminal connect:
One end of the 12” 4/0 Cable jumper (other end goes to battery #2 NEG).
#2 AWG negative cable from the common quick connect (red housing with handle).
Black wire from Channel #1 of dual charger (lower channel).
b) To #3 Battery POS Terminal connect:
One end of second 12” 4/0 Cable jumper (other end goes to battery #2 POS).
#2 AWG positive cable from 12 Volt quick connect.
Red wire from Channel #1 of dual charger (lower channel).
c) To #2 Battery (middle battery) NEG Terminal connect:
Other end of 12” 4/0 cable jumper from NEG terminal of battery #3.
Black wire from Channel #2 of dual charger (upper channel).
d) To #2 Battery POS Terminal connect:
Other end of 12” 4/0 cable jumper from POS terminal of battery #3.
4/0 positive cable from jumper cable quick connect (gray housing).
e) To #1 Battery (closest to chargers) – NEG Terminal connect:
4/0 negative cable from jumper cable quick connect (gray housing).
#2 AWG negative cable from 12 Volt quick connect.
#4 AWG negative cable of vehicle harness.
f) To #1 Battery POS Terminal connect:
#2 AWG positive cable from the common quick connect (red housing with handle).
#4 AWG positive cable of vehicle harness.
Red wire from AMPS gauge right side (stud closest to front of unit).
4. Tighten all battery nuts.
5. Compare all connections against the attached schematic to ensure that all elements of the FMB1224 system
are properly connected.
6. Make sure both battery type switches (mounted by fans on chargers) are set to the type of batteries installed
in unit. (STD for standard flooded cell battery, AGM for AGM battery).
7. Plug in unit power cord to charge the batteries. The AMPS gauge will register the proper charge rate being
applied to the batteries. Internally, all chargers will have a red LED lit showing the start of the charge cycle.
8. When the AMPS gauge reaches “0”, the batteries are fully charged and the unit is ready for use. Internally, all
chargers will have a green LED lit, indicating charge cycle is complete and maintenance mode engaged.
9. Close lid of FMB1224 unit.
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