Jump Or Slave Starting

Jump start or a slave start is the process you need to go through to put sufficient charge into a flat battery on a vehicle using another vehicle as a portable battery charger. 
Once the dead vehicle is started, it’s own alternator should be able to recharge it’s own flat battery.
BASIC CAUTIONS. 
Large vehicles like trucks (lorries) typically use a 24 volt two battery system where as a simple car or light van will only use one battery or 12 volt system. 24 volts into 12 volts usually goes BANG!
Most vehicles use a NEGATIVE (BLACK) Earth connection BUT you need to check which side of the battery is DIRECTLY CONNECTED to the bodywork or chassis. 
Get it wrong and you’ll have an expensive repair bill or at worse, two burnt out vehicles.
When connecting batteries remember BLACK TO BLACK THEN RED TO RED i.e.

 

  
 
What happens if you get the battery leads the wrong way round?


If you are lucky, the most that happens is the jump leads smoke and the battery sparks but it can cause a fire IN BOTH CARS. 

Here is an in depth guide.
You need heavy duty jump leads, a small wire brush, safety glasses, rubberized work gloves.

It’s a good idea to have a dry powder fire extinguisher handy. 

If at anytime things go wrong, WEARING GLOVES, quickly disconnect the BLACK EARTH cable then the RED POSITIVE Cable. 

 THEY WILL BE HOT, VERY HOT, RED HOT!

Then and only if it is safe you can fight the fire.
  1. NEVER try to work on a battery that looks damaged, frozen, low fluids, or badly corroded.
  2. Don’t smoke or work near a naked flame Batteries give off highly flammable hydrogen gases when charging. ONE SPARK and it could cause an explosion.
  3. NEVER jump start a battery in a garage or air confined space.
  4. Take off any “dangly” bits like ties
  5. Don safety glasses and gloves
  6. Don’t even try to jump start unless you own heavy duty leads 
  7. Check they are free of damage or corrosion and both sets of battery terminals are clean. If you have to use the wire brush, be careful NOT to touch any battery mounting clips or the bodywork.
  8. Park the vehicles nose to nose but not touching.
  9. Turn off both cars and remove the keys (Caution voltage spikes can kill key fobs and ECU’s
  10. Check all ancillary services, lights, radios, etc are OFF in both cars.
  11. Always work DEAD CAR TO GOOD CAR.
  12. BE CAREFUL NOT TO TOUCH ANY METAL WORK ON EITHER CAR 
  13. CONNECT THE RED LEAD (POSITIVE +) on both cars FIRST
  14. CONNECT THE BLACK LEAD (EARTH ) SECOND on both cars
  15. Wait for 3 minutes to allow the batteries to equalize
  16. Start the good car and run it at a fast idle (1500 rpm) for at least a minute.
  17. With the good car still running, start the other car and keep both connected and running at a fast idle (1500 rpm) for 7-10 minutes
  18. Turn both cars OFF, remove the keys (Caution Voltage spikes)
  19. BE CAREFUL NOT TO TOUCH ANY METAL WORK ON EITHER CAR
  20. DISCONNECT THE BLACK (EARTH) LEAD FIRST FROM BOTH CARS (Bad Car First)
  21. DISCONNECT THE RED (POSITIVE) LEAD SECOND FROM BOTH CARS (Bad Car First)
 Finally restart the other car and leave it running at a fast idle for 15 minutes or preferably, go for a drive.
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