Maintenance And Care; Troubleshooting - Schumacher 105-4 Owner's Manual

Example:
Ah rating x % of charge needed x 1.25 = hrs of charge
Charger Amp setting
100 (Ah rating) x .50 (charge needed) x 1.25 = 3.125 hrs
20 (Charger Setting)
100 x .50 x 1.25 = 3.125
20
You need to charge a 100 Ampere hour battery for a little more than 3 hrs at the 20 Amp charge rate,
using this example.
Use the following table to determine the time it will take to bring a battery to full charge.
The times given are for batteries with a 50% charge prior to recharging.
CCA = Cold Cranking Amps Ah = Amp Hour
RC = Reserve Capacity NR = Not Recommended
BATTERY SIZE/RATING
SMALL
BATTERIES
CARS/TRUCKS
MARINE/DEEP-CYCLE

13. MAINTENANCE AND CARE

A minimal amount of care can keep your battery charger working properly for years.
• Clean the clamps each time you are finished charging. Wipe off any battery fluid that may have come
in contact with the clamps to prevent corrosion.
• Occasionally cleaning the case of the charger with a soft cloth will keep the finish shiny and help
prevent corrosion.
• Coil the input and output cords neatly when storing the charger. This will help prevent accidental
damage to the cords and charger.
• Store the charger unplugged from the AC power outlet in an upright position.
• Store inside, in a cool, dry place.
• Store the clamps on the storage areas provided on the handle. Do not store the clamps clipped
together, on or around metal, or clipped to the cables.

14. TROUBLESHOOTING

PROBLEM
Charger will not turn on
when properly connected.
The battery is connected
and the charger is on, but
is not charging.
6-12 Ah
Motorcycle,
garden tractor, etc.
12-32 Ah
200-315 CCA 40-60 RC
315-550 CCA 60-85 RC
550-1000 CCA 85-190 RC
80 RC
140 RC
160 RC
180 RC
POSSIBLE CAUSE
AC outlet is dead.
Poor electrical connection.
Clamps are not making a good
connection.
CHARGE RATE/CHARGING TIME
10A 20A
NR NR
NR NR
2¼-3 h 1-1½ h
3-3¾ h 1½-2 h
3¾-7 h 2-3½ h
3½ h 1¾ h
5½ h 2¾ h
6 h 3 h
6½ h 3¼ h
Check for open fuse or circuit breaker
supplying AC outlet.
Check power cord and extension cord
for loose fitting plug.
Check for poor connection at battery
and frame. Make sure connecting
points are clean. Rock the clamps
back and forth for a better connection.
• 11 •
50A
NR
NR
25-35 min
½-¾ h
¾-1½ h
NR
NR
NR
NR
SOLUTION