Craftsman DieHard Automatic Battery Charger 10/2/50 amp. Owner's Manual | Page 9

Craftsman Mechanics Equipment Owner's Manual - DieHard Automatic Battery Charger 10/2/50 amp..
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Using the 50 Amp Engine Start feature 

Your battery charger can be used to jumpstart your car if the battery is low. Follow these 

instructions on how to use the ENGINE START feature.

Follow all safety instructions and precautions for charging your battery. 

Wear complete eye protection and clothing protection. Charge your 

battery in a well-ventilated area.
Using the ENGINE START feature WITHOUT a battery installed in the 

vehicle could cause damage to the vehicle’s electrical system. 

NOTE: If 

you have charged the battery and it still will not start your car, do not use 

the engine start feature, or it could damage the vehicle’s electrical system. 

Do not leave the charger in Engine Start Mode for longer than 9 minutes at 

a time, or you will damage the charger.

1.  With the charger unplugged from the AC outlet, connect the charger to the battery 

following the instructions given in section 6: FOLLOW THESE STEPS WHEN 

BATTERY IS INSTALLED IN VEHICLE.

2.  Plug the charger AC power cord into the AC outlet.
3.  With the charger plugged in and connected to the battery of the vehicle, set the 

charge rate selector switch to the engine start position.

4.  Crank the engine until it starts or 10 seconds pass. If the engine does not start, wait 3 

minutes before cranking again. This allows the charger and battery to cool down.

NOTE: During extremely cold weather, or if the battery is under 2 volts, charge the battery 

for 5 minutes before cranking the engine.

5.  If the engine fails to start, charge the battery for 5 more minutes before attempting to 

crank the engine again.

6.  After the engine starts, unplug the AC power cord before disconnecting the battery 

clips from the vehicle.

7.  Clean and store the charger in a dry location.

NOTE: If the engine does turn over but never starts, there is not a problem with the 

starting system; there is a problem somewhere else with the vehicle. STOP cranking the 

engine until the other problem has been diagnosed and corrected.
Engine Starting Notes 

During the starting sequence listed above, the charger is set to one of three states.
Wait for cranking  The charger waits until the engine is actually being cranked before 

delivering sufficient charge (up to 50 amps) for engine start. While waiting, the charger 

delivers a charge of up to 10 amps, and will go into Abort Mode if the engine is not 

cranked within 15 minutes.  
Cranking  When cranking is detected, the charger will automatically deliver up to its 

maximum output as required by the starting system for as long as 10 seconds of cranking.  
Cool Down – After cranking, the charger enters a mandatory 3 minute (180 second) cool 

down state. During the cool down period, the charger delivers a charge of up to 10 amps 

and the LED will blink slowly (1x per second). After 3 minutes, the LED will start blinking 

fast (4x per second), indicating that another crank cycle can be started. 

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