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Doss DPS300 User Manual page 3

300 amp battery jumper with 260psi air compressor

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4. Remove the charging jack cover and insert the DC charger cable into the charging jack located on the front panel.
5. While the Power Station is recharging, the red LED charging indicator will be lit. A typical recharge time is 8 to 12 hours.
6. During the charging period, you can press and hold the battery status button to check the Power Station battery charge
level. The red LED, then the yellow LED and finally the two green LEDs will illuminate sequentially during the charging
process. Continue charging until the two green LEDs remain lit constantly. Disconnect the DC charger cable after the
Power Station is fully charged.
JUMP-STARTING A VEHICLE
WARNING:
Vehicles equipped with on-board computers may be affected if the engine battery is jump-started.
Read your vehicle owner's manual before attempting to start the vehicle to determine if external
starting assistance can be used. Failure to follow these instructions may cause damage or
explosion. Use safety glasses to protect eyes while jump-starting a battery.
1. Turn off the vehicle ignition and all accessories (e.g. radios, lights, air conditioners and cellular phones).
2. Set the emergency brake and put vehicles with automatic transmission in park position.
3. Make sure the Jump Start System Power Switch is in OFF position.
4. Determine the polarity of the vehicle's battery terminals. The positive (POS, P, +) battery terminal usually is larger in
diameter than the negative (NEG, N, -) terminal. If you are unsure, you should refer to the vehicle's owner's manual.
5. Determine whether your vehicle uses a negative or positive grounded system:
Negative ground system –
Positive grounded battery terminal is grounded to chassis or any other part of the vehicle. If you are unsure, you should
refer to vehicle owner's manual.
6. Never allow clamps (positive & negative terminals) to touch together or to contact the same piece of metal to prevent
short-circuits and arcing.
7. Follow instructions for a negative grounded system or positive grounded system as indicated below:
Negative Grounded System:
a. Securely connect the positive (+) red clamp to the positive (POS, P+) terminal of the vehicle battery or the remote
positive (+) terminal if equipped.
b. Securely connect the negative (-) black clamp to the vehicle chassis, engine block or a non-moving metal part of the
vehicle which is verified to be grounded. Do not clamp directly to negative battery terminal, carburetor, fuel lines, or
sheet metal body parts.
c. See jump-starting step 7 to continue.
Positive Grounded System:
a. Securely connect the negative (-) black clamp to the negative (Neg, N-) ungrounded terminal of the vehicle battery.
b. Securely connect the positive (+) red clamp to the vehicle chassis, engine block or a non-moving metal part of the
vehicle which is verified to be grounded. Do not clamp directly to positive battery terminal, carburetor, fuel lines, or
sheet metal body parts.
c. See jump-starting step 7 to continue.
8. The Reverse Polarity Indicator on the Jump Starter will illuminate RED for wrong connection and GREEN for right connection.
9. When correct clamp connection is made, turn the Jump Start System Power Switch to ON position.
10. Allow 2 or 3 minutes of charging time. It is recommended to have a second person to assist holding the unit securely in
place during the next steps.
11. Turn on the vehicle to attempt to start the engine. If the vehicle does not start after 4 to 5 seconds of engine cranking,
then stop. Wait 3 to 4 minutes, and then try again. Repeat several times until the vehicle starts.
CAUTION:
Excessive engine cranking can damage vehicle starter motor. If the engine turns, but fails to start
after several attempts, other technical problems might be involved. Discontinue cranking the
engine until the other problem is determined and corrected.
12. Standing as far away from the vehicle battery as is practical, disconnect the clamps in reverse sequence to connecting
procedure:
For negative grounded systems, first disconnect negative (black) then positive (red) clamps.
For positive grounded systems, first disconnect positive (red) then negative (black) clamps.
Negative battery terminal is grounded to chassis. Most vehicles use this system.
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