Installation Manual

6
ChargeMaster Plus 12/75-3, 12/100-3, 24/40-3, 24/60-3 – User and Installation Manual
2.7 When battery is installed in vehicle
A SPARK MAY CAUSE BATTERY EXPLOSION.
To reduce risk of a spark near battery:
1 Position AC and DC cords to reduce risk of
damage by hood, door, or moving engine
part.
2 Stay clear of fan blades, belts, pulleys, and
other parts that can cause injury to persons.
3 Check polarity of battery posts. POSITIVE
(POS, P, +) battery post usually has larger
diameter than NEGATIVE (NEG, N,–) post.
4 Determine which post of battery is grounded
(connected) to the chassis. If negative post is
grounded to chassis (as in most vehicles), see
(5). If positive post is grounded to the chassis,
see (6).
5 For negative-grounded vehicle, connect
POSITIVE (RED) clip from battery charger to
POSITIVE (POS, P, +) ungrounded post of
battery. Connect NEGATIVE (BLACK) clip to
vehicle chassis or engine block away from
battery. Do not connect clip to carburetor, fuel
lines, or sheet-metal body parts. Connect to a
heavy gage metal part of the frame or engine
block.
6 For positive-grounded vehicle, connect
NEGATIVE (BLACK) clip from battery charger
to NEGATIVE (NEG, N, –) ungrounded post of
battery. Connect POSITIVE (RED) clip to
vehicle chassis or engine block away from
battery. Do not connect clip to carburetor, fuel
lines, or sheet-metal body parts. Connect to a
heavy gage metal part of the frame or engine
block.
7 When disconnecting charger, turn switches to
off, disconnect AC cord, remove clip from
vehicle chassis, and then remove clip from
battery terminal.
8 See operating instructions for length of
charge information.
2.8 When battery is outside vehicle
A SPARK MAY CAUSE BATTERY EXPLOSION.
To reduce risk of a spark near battery:
1 Check polarity of battery posts. POSITIVE
(POS, P, +) battery post usually has a larger
diameter than NEGATIVE (NEG, N, –) post.
2 Attach at least a 24-inch-long 6-gauge (AWG)
insulated battery cable to NEGATIVE (NEG, N,
–) battery post.
3 Connect POSITIVE (RED) charger clip to
POSITIVE (POS, P, +) post of battery.
4 Position yourself and free end of cable as far
away from battery as possible – then connect
NEGATIVE (BLACK) charger clip to free end
of cable.
5 Do not face battery when making final
connection.
6 When disconnecting charger, always do so in
reverse sequence of connecting procedure
and break first connection while as far away
from battery as practical.
2.9 Preparing to charge
1 If it is necessary to remove battery from
vehicle to charge, always remove grounded
terminal from battery first. Make sure all
accessories in the vehicle are off, so as not to
cause an arc.
2 Be sure area around battery is well ventilated
while battery is being charged.
3 Clean battery terminals. Be careful to keep
corrosion from coming in contact with eyes.
4 Add distilled water in each cell until battery
acid reaches level specified by battery
manufacturer. Do not overfill. For a battery
without removable cell caps, such as valve
regulated lead acid batteries, carefully follow
manufacturer’s recharging instructions.
5 Study all battery manufacturer’s specific
precautions while charging and
recommended rates of charge.
Note that the ChargeMaster Plus charge
specifications are based on Mastervolt bat-
teries. Specifications for a given chemistry of
a different manufacturer may vary. If connec-
ting batteries of a different manufacturer,
make sure the manufacturer's recommenda-
tions are met.
6 Determine voltage of battery by referring to
car owner’s manual and make sure that
output voltage selector switch is set at correct
voltage. If charger has adjustable charge rate,
charge battery initially at lowest rate.
Exception: For a charger not having an output
voltage selector switch, determine voltage of