Never jump start

[JDM_GUY]

This is what happened when jump starting a Nissan b15.

[red_dragon]

did they start and rev the other car ?

[FullStop]

was the correct procedure followed? B15 doesn't have a main fuse?

[nervewrecker]

You gave the js or got it?

[FullStop]

hoping you din take a jump from a 24v truck...

[rmrunner]

Looks like the proper procedure wasnt used. When jump starting the car getting the jump......must ground clamp on engine block and positive on battery pole. This is in order for you not to have a spike in voltage and current. Only the voltage is needed for the jump

[Anil_Sooknanan]

^^^^^padna yuh loss meh day with that one big time

[INDAVID WORKSHOP]

The correct process as I understand with cars with computer brainbox, the vehicle giving the bridge start must be switched off to prevent current surge or backflow to damage the brainbox.

This was recommended by many electrician I had this discussion with.

[Hook]

You're connecting positive to positive with your jumper cable, and then the negative pole on the donor car connects to an engine ground or unpainted metal surface away from the dead battery. This is to prevent sparking near the discharged battery, which will be releasing a high amount of hydrogen gas, like discharged wet cells normally do. The last thing you want is an engine fire from igniting hydrogen from a dead battery.

DO NOT START THE DONOR CAR!

This ensures that you're starting your car with just 12v, not 14.4v with the addition of the alternator, just 12v from the donor battery alone.
Why?
To prevent voltage spikes.

The sharp and periodic drain from the dead battery and starter of one vehicle causes the alternator of the donor car to increase output for a second as the load increases when you try to start the dead car. This can mess with the electronics of either car if it spikes too high.

[Anil_Sooknanan]

so what the big deal with connecting to the engine ground and not the negative pole itself?

[Hook]

I covered that in the first paragraph of my post.



Really.

[Strugglerzinc]

The procedure is covered in every FSM I've seen so it is manufacturer approved.

Once done as Hook described there will be no issue.

[eitech]

Power dome FTW!!!


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[belalegosi]

This is what happened when jump starting a Nissan b15.

lol

[krisjoseph_2000]

Ground on engine block rev car and put on headlights to drain residual current.

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[zoelikescheese]

so what the big deal with connecting to the engine ground and not the negative pole itself?

[Hook]

Ground on engine block rev car and put on headlights to drain residual current.

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What?

[Biggs3ne]

how about just taking d battery from d donor car and starting d car with d dead battery with d donor battery..jus reconnect dead battery once car is running and let it charge up...never believed in that jump starting thing nah

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[Hook]

how about just taking d battery from d donor car and starting d car with d dead battery with d donor battery..jus reconnect dead battery once car is running and let it charge up...never believed in that jump starting thing nah

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You're doing more harm than good there. That might've been fine for older cars where the most complex electronic device on board might be the stereo, but not for today's fuel injected cars.

The battery acts like a capacitor once the engine is running. That's to prevent severe voltage dips when devices like cooling fans, a/c compressor and headlights are switched on. It also gives a bit of "smoothening" to the ripple DC generated by the alternator.

When you disconnect a battery from a vehicle that's running and then reconnect it, you're introducing "noise" or ripple into that car's electrical AND a voltage spike when you disconnect and a dip when you reconnect (your idle speed will rise when you pull the poles). That isn't good for anything.

If you have the time, it would be better to disconnect the dead battery, connect it to a charger for a bit and then try restarting.

[Biggs3ne]

Thank you for your good advice..it is very much appreciated..

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[nervewrecker]

Thanks hook. Real good info in here.

[Sundar]

Jus asking this method; when jump starting(battery boosting),Supply car is started, connected(-ve cable last to the block) and the boosted(dead battery) car is started, the negative cable is immediately removed, to prevent the spike from the alternator. also can the cables be connected to the battery to recharge before jumping

[Hook]

Unless you can disconnect that cable faster than the speed of electricity, I doubt it.

You actually CAN connect the dead battery to the donor vehicle (started) to charge it, but without a battery isolator, it's risky.

All batteries have an internal resistance (it's what they check with the megger when u carry your car to the battery dealer for servicing/check-up). When a battery discharges or is dying, its internal resistance drops. This is what increases the load (current draw) on your alternator (I=V/R). In extreme cases, it drops so low, it acts like a short circuit. That's what fries some alternators.

Ohm's Law. You're placing a lower resistance (dead battery) in parallel with a good battery, now your total battery resistance is the mean of the two, which acts like the good battery is depleted and increases the load on the donor car's alternator. Like I said, it's risky because you don't know the condition of the dead battery.
I wouldn't chance it.

[timos976]

Nice thanks

You're connecting positive to positive with your jumper cable, and then the negative pole on the donor car connects to an engine ground or unpainted metal surface away from the dead battery. This is to prevent sparking near the discharged battery, which will be releasing a high amount of hydrogen gas, like discharged wet cells normally do. The last thing you want is an engine fire from igniting hydrogen from a dead battery.

DO NOT START THE DONOR CAR!

This ensures that you're starting your car with just 12v, not 14.4v with the addition of the alternator, just 12v from the donor battery alone.
Why?
To prevent voltage spikes.

The sharp and periodic drain from the dead battery and starter of one vehicle causes the alternator of the donor car to increase output for a second as the load increases when you try to start the dead car. This can mess with the electronics of either car if it spikes too high.

[timos976]

In some foreign use dealership.. i noticed they normally take another battery and touch the postive and negative(no Jumper Leads) of both batteries to jump start the vehicle....

how about just taking d battery from d donor car and starting d car with d dead battery with d donor battery..jus reconnect dead battery once car is running and let it charge up...never believed in that jump starting thing nah

Sent from my GT-S5360L using TriniTuner mobile app

You're doing more harm than good there. That might've been fine for older cars where the most complex electronic device on board might be the stereo, but not for today's fuel injected cars.

The battery acts like a capacitor once the engine is running. That's to prevent severe voltage dips when devices like cooling fans, a/c compressor and headlights are switched on. It also gives a bit of "smoothening" to the ripple DC generated by the alternator.

When you disconnect a battery from a vehicle that's running and then reconnect it, you're introducing "noise" or ripple into that car's electrical AND a voltage spike when you disconnect and a dip when you reconnect (your idle speed will rise when you pull the poles). That isn't good for anything.

If you have the time, it would be better to disconnect the dead battery, connect it to a charger for a bit and then try restarting.

[Hook]

I heard about that, but I've never seen it. I went in to one dealership in south once to collect a vehicle and turns out the vehicles carded to leave the yard had their batteries removed and put on a trickle charger from the night before so no jump starts when customers come in.
That way, you don't look like a quack, or risk damaging anything and it doesn't take two people to start a car

[timos976]

lol well they did it alot of times.... even for my car....but i assume they know what the were doing.... Now that I have a better understanding of Jump Starting Vehicles I will make the necessary precautions. Thanks

[nos_specialist]

what people fail to realise, is that the flux capacitor's negatively charged anode is connected to the ground of the car. When the Battery to jump start the car, is connected and if the amperage is not the same as the flux capacitor, then it will emit an electromagnetic pulse of approximately 20 BTUs of energy causing damage to the circuit board in the vehicle's computer.

For this same reason i have published a book "How to jump start cars for dummies", copies are sold for $999.99 vat inclusive, and you get free jumper cables, and a fire extinguisher. CALL NOW to place your order.

[black start]

^not sure if troll post


real good info in here though...

Hook, you are a electrician oar?

[toybago]

how about just taking d battery from d donor car and starting d car with d dead battery with d donor battery..jus reconnect dead battery once car is running and let it charge up...never believed in that jump starting thing nah

this is risky too even with older cars, because you dont know the state of the charging system of the car that needs the "jump". *cool story time* i switched batteries with a guy whose battery had died. they got the van started and i yanked my battery out as soon as his van was re-stared and dead battery re-installed. i was walking toward my car battery in hand when there was a loud bang. dead battery exploded sending bits and pieces everywhere

good thing it didnt happen when my battery was attached or when someone was leaning over said battery attaching/removing terminals....