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AC POWER CORD CONNECTION INSTRUCTIONS
1. GR-1 should be grounded to reduce risk of electric shock. GR-1 is equipped with an electric cord having
an equipment grounding-conductor and a grounding plug. The plug must be plugged into an outlet that is
properly installed and grounded in accordance with all local codes and ordinances. This battery charger
is for use on a 230 AC V circuit.
2. DANGER: NEVER ALTER AC CORD OR PLUG PROVIDED-IF IT WILL NOT FIT OUTLET, HAVE
PROPER OUTLET INSTALLED BY A QUALIFIED ELECTRICIAN. IMPROPER CONNECTION CAN
RESULT IN THE RISK OF AN ELECTRIC SHOCK.
3. An extension cord should not be used unless absolutely necessary. Use of improper extension cord could
result in a risk of fire and electric shock. If extension cord must be used, make sure that:
a) Pins on extension cord are the same number, size, and shape as those of plug on GR-1;
b) Extension cord is properly wired and in good electrical condition; and
c) Wire size is large enough for AC ampere rating of GR-1 as specified in the following table:
RECOMMENDED MINIMUM AWG SIZE FOR
EXTENSION CORDS
WHEN USED WITH BATTERY CHARGERS
AC Input Rating, Amperes Length of Cord, Feet
Equal to or But less 25 50 100 150
greater than... than... AWG Size of Cord
8 10 18 14 12 10
10 12 16 14 10 8
12 14 16 12 10 8
14 16 16 12 10 8
16 18 14 12 8 8
GR-1 CONNECTION - BATTERY IN VEHICLE
1. Before working on vehicle, firmly apply emergency brake and place gearshift to NEUTRAL – shift an
automatic transmission to P.
2. Locate GR-1 as far away from battery as GR-1 cords permit and position AC and DC cords to avoid
stepping on or tripping over them and to prevent damage by hood, doors, or moving engine parts.
3. Stay clear of fan blades, belts, pulleys, and any other parts that can cause physical injury.
4. Turn OFF all vehicle loads, including door lights, and correct any defects in car’s electrical system that
may have caused low battery.
5. Check polarity of battery posts. The POSITIVE (+) post usually has larger diameter than NEGATIVE (–)
post.
6. Determine which post of battery is grounded (connected) to chassis. If negative post is grounded see
step 7. If positive post is grounded see step 8.
7. For negative-grounded vehicle, first connect POSITIVE (red) clamp from GR-1 to POSITIVE (+)
ungrounded post of battery. Then connect NEGATIVE (BLACK) clamp to NEGATIVE (–) post of battery.
Do not connect clamp to carburetor, fuel lines, or sheet metal body parts. Connect to a heavy gauge metal
part of frame or engine block. When disconnecting charger, turn switches OFF, disconnect AC cord,
remove clamp from vehicle chassis, and then remove clamp from battery terminal.
8. For positive-grounded vehicle, connect NEGATIVE (BLACK) clamp from charger to NEGATIVE
ungrounded post of battery. Then connect POSITIVE (RED) clamp to vehicle chassis or engine
block away from battery. Do not connect clamp to carburetor, fuel lines, or sheet metal body parts.
Connect to a heavy gauge metal part of frame or engine block. When disconnecting charger, turn
switches OFF, disconnect AC cord, remove clamp from vehicle chassis, and then remove clamp from
battery terminal.
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