Jump start also called as Boost, is the method of starting vehicle with discharged battery by attaching a good battery of another vehicle or by any other external power source. Jump starting a car refers to recharging a dead (uncharged) car battery just enough to get the starter motor rotating.

1. JUMP STARTING
A VEHICLE
S H I V L E E L A S . A N G A D I
A D A M C E N T E R , P U N E
2 0 / 2 / 2 0 1 9 1

2. BASICS
• Jump start also called as Boost, is the method of starting vehicle with
discharged battery by attaching a good battery of another vehicle or by
any other external power source.
• Jump starting a car refers to recharging a dead (uncharged) car battery
just enough to get the starter motor rotating.
• The external supply of electricity recharges the disabled battery and
provides some power to crank the engine.
• To jump start a car, you need a second car with a fully charged battery;
you then connect the positive terminals of each battery to each other,
and the negative terminals to each other.
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3. CIRCUIT DIAGRAM
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Fig. 1. Jump starting of
vehicle
Source : www.google.com/search?q=jump+starting+of+vehicle

4. COMPONENTS REQUIRED FOR JUMPSTART
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1
2
3 4
COMPONENTS:
1. Jumper cables
2. Good battery
3. Safety goggles
4. Safety gloves
Fig. 2 : Components required for
jumpstart

5. PROCEDURE TO
JUMP START A
VEHICLE
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6. 1. CHECKING THE BATTERY
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• Make sure the battery is the problem.
Check the headlights. Are they dim or bright?
(Note that in some cars you will need to turn the
ignition on to test the headlights). If they are dim,
it's likely your battery is the culprit. If your
headlights are bright, you do not have a dead
battery and a jump start will not help.
• Ensure that the doors will unlock when you push
the button on the key and/or try to open the door
from the outside, the interior lights work, and the
clock or GPS (if equipped) moves or powers on.
• Put the key in the ignition and see whether your
dashboard lights up as usual. Test the stereo. In
most cases, even with a low battery you should see
some dashboard lights and get some sound out of
the stereo. If you do not get a flicker out of your
dashboard, you may have a problem with
your ignition switch.
• Try to start the car. Does it turn over very slowly, or
does it crank quickly? If it cranks quickly, you do not
have a dead battery and a jump start will not help. If
it cranks slowly, or not at all, you probably have a
dead battery.
Fig. 3 : checking the
battery
Source : https://www.wikihow.com/Jump-Start-
a-Car

7. 2. LOCATE THE BATTERY
• Open each car’s hood and locate the
battery. On most cars, it will be near the
front of the car on the right or left side,
on some cars the battery is located near
the firewall between the engine and
passenger compartment. In some cars the
battery is located in the trunk. If unsure,
check your car manual for location of the
battery. Identify the positive and negative
terminals.
• The positive terminal will be marked with
plus sign (+) and will usually have a red
cable attached on it.
• The negative terminal will be marked with
a minus sign (-) and will usually have a
black cable attached to it.
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Fig. 4 : Locate
battery
Source : https://www.wikihow.com/Jump-Start-
a-Car

8. 8
• Park the working car near, but not
touching, the disabled car.
• Park the car in such a way that the distance
between both car batteries is as small as
possible. Turn off the engine, radio, lights,
A/C, fans and all other electrical
components. Make sure that all of these
things are off in the disabled car, too.
• Don't let the cars touch at all. If the cars are
touching, jumping the battery can cause a
dangerous electrical arc between the
vehicles.Fig. 5 : Park both the
cars
Source : https://www.wikihow.com/Jump-Start-
a-Car
3. PARK WORKING CAR NEAR
THE DISABLED CAR

9. • Put on safety gear (goggles and
gloves) if you have it.
• Inspect batteries for cracks, leaks or
other damage. If you find any of these
things, do not jump start the car. Call a
tow truck instead or replace the
battery. It may be necessary to remove
the disabled automobile's battery
cables from the battery terminals and
clean both cables and terminals. Use a
stiff wire brush to remove all corrosion.
Reconnect the cables to the battery
terminals and jump the car.
• Remove any positive (+) red post
protective covers if applicable.
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Fig. 6 : Safety
measures
4. SAFETY MEASURES
Source : https://www.wikihow.com/Jump-Start-
a-Car

10. • Untangle and unwind your jumper
cables.
• Like your battery, your jumper
will probably have red and black
cables and will have heavy-duty
clamps to connect to the battery
terminals.
• You must make sure that the red
and black ends of your jumper
cables never touch each other once
they are connected to the batteries;
permitting them to do so can result
in serious arcing and/or damage to
one or both cars.
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Fig. 7 : Safety
measures
Source : https://www.wikihow.com/Jump-Start-
a-Car

11. • Connect the jumper cables in the order
described below:
1. Connect one red clamp to the positive (+)
terminal of the dead battery.
2. Connect the other red clamp to the positive
(+) terminal of the good battery.
3. Connect one black clamp to the negative (-)
terminal of the good battery.
4. Connect the other black clamp to a piece of
grounded metal on the dead
car, preferably the bolt where the thick
negative cable from the battery connects to
the chassis. If this is not practical, look for
shiny metal (not painted or oily) that is
attached to the engine. Usually a nut, bolt or
other protruding shiny metal will work. You
may see a small spark when you connect to
good ground. As a last resort, you may
connect to the negative (-) post of the dead
battery, but this risks igniting hydrogen gas
coming off the battery.
5. Make sure none of the cables are dangling
into the engine compartment, where they
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Fig. 8 : Battery
Connections
Source : https://www.wikihow.com/Jump-Start-
a-Car
5. BATTERY CONNECTIONS

12. • Start the working car.
• Let it idle for a few minutes. Do not race
the engine, but do rev the engine a little
above idle for 30 to 60 seconds. You do
this to charge the battery in the dead car,
because the starter in the dead car will
draw most of the required current (well in
excess of 100 amps) from that
battery, not through the cables.
• Common retail jumper cables are not built
to pass the current required.
• Charging the dead battery is a must. If 30
seconds doesn't do it, try charging for the
full 60 seconds by keeping the engine at a
high idle.
• A good, clean connection between the
battery cables and the battery terminals is12
6. START THE WORKING CAR
Fig. 9 : Start the working
car
Source : https://www.wikihow.com/Jump-Start-
a-Car

13. • Try to start the disabled vehicle.
• If it does not start, shut the engine
off and disconnect the last
connection temporarily while
you slightly twist or wiggle each of
the four clamps to help ensure a
good electrical connection.
• Restart the working car again. Allow
another five minutes for charging
before attempting to start the
disabled vehicle. If this does not
work after a few tries, you may
to have the car towed or
replaced.
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7. START THE DISABLED CAR
Fig. 10 : Start the disabled
car
Source : https://www.wikihow.com/Jump-Start-
a-Car

14. • Remove the jumper cables once the car
starts.
• Do this in the reverse of the order in which
they were attached, and don't let any of the
cables or clamps touch each other (or
into the engine compartment).
1. Disconnect the black clamp from
metal on the dead car.
2. Disconnect the black clamp from the
negative (-) terminal of the good battery.
3. Disconnect the red clamp from the
(+) terminal of the good battery.
4. Disconnect the red clamp from the
(+) terminal of the dead battery.
5. Replace any positive (+) red post
covers if applicable. These covers help
prevent accidental short circuiting the
battery. 14
8. PROCEDURE TO REMOVE CONNECTIONS
Fig. 11 : Procedure to remove
connections
Source : https://www.wikihow.com/Jump-Start-
a-Car

15. 9. DISABLED CAR IN RUNNING CONDITION
• Keep the recently-disabled car's engine
running.
• Run the car above idle (slightly revved up
with your foot on the gas) for five
and then on or above idle for 20 minutes
before turning it off.
• This should give the battery enough
charge to start the car again. If it does
you probably have a dead battery or a
dying alternator.
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Fig. 12 : Disabled car in running
condition
Source : https://www.wikihow.com/Jump-Start-
a-Car

16. 16
Source : www.google.com/How-to-jump-start-vehicle
How to Properly Jump Start a Car.mp4

17. WHAT HAPPENS WHEN YOU JUMPSTART
YOUR CAR THE WRONG WAY?
17
What happens when you Jump Start your car the WRONG WAY!.mp4
Source : www.google.com/jump start car
animation

18. SPECIFICATIONS OF JUMPER CABLES
• Jumper cable gauge refers to the thickness of the jumper cable’s wiring.
• A standard set of jumper cables has a gauge rating of six.
• The smaller the gauge rating, the thicker the cables are.
• The thicker the cables are, the more effective they’ll be.
• Nevertheless, a set of jumper cables with a gauge rating of eight should provide
enough power to jump start most vehicles.
• For larger vehicles with larger batteries, it may be necessary to use a set of jumper
cables with a gauge rating of six, or even four or two.
• The lower the gauge rating, the more expensive the cables tend to be.
• Thickness of Jumper cables varies with current carrying capacity.
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19. FOR MOST CARS
• For most cars it is recommend to use
4 gauge jumper cables.
• 4 Gauge x 20 Ft 500A Heavy duty
• This set will crank 500 Amps and is 20
feet long
FOR TRUCKS
• For heavy duty trucks, especially
diesel it is recommend to use 1 gauge
jumper cables.
• 1 Gauge x 25 Ft 800A Heavy duty
• This set of cables will crank 800 Amps
and is 25 feet long.
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Fig. 13 : 4 Gauge x 20 Ft Jumper cable
Source : www.google.com/ 4 Gauge x 20 Ft Jumper cable
Fig. 14 : 1 Gauge x 25 Ft Jumper cable
Source : www.google.com/ 1 Gauge x 25 Ft Jumper
cable

20. FACTS
• Jumper cables should not be used to interconnect between different
voltage systems. Connecting 6V and 12V systems together may cause
damage.
• If the dead battery is physically damaged, has a low electrolyte level, is
decayed or frozen, a jump start will not repair the battery. A vehicle
with a frozen battery should not be jump started, as the battery may
explode.
• Jumper cables typically do not have overload protection, so when
reversed they may become hot enough that the wire insulation begins
to melt. If this continues without the problem being detected, the
insulation may melt until the wires inside make contact, resulting in an
unfused direct short of the supply battery.
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21. • Batteries die not because they lose voltage or the ability to store charge,
but because resistance between the terminals increases as the internal
electrodes corrode.
• In the case of car batteries, a fully charged battery will measure about
12.6 volts between the terminals, while a completely dead battery will
measure 11.9 volts. Thus, there actually is a voltage between the two
batteries which will conveniently cause charge to flow from the full
battery to the dead one.
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22. THANK YOU
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