Jumping off a car

V

Vince

Hero member
I was reading on another site about a bike that wouldn't start,it was suggested to jump start it off a car.Then there came the don't do it,it will BLA BLA BLA.I have done this heaps over the years without a problem.Am I missing some green smoke.I expect the car would put out similar at the battery to a bike,14.5 when rev ed and 13 at idle?
 
No reason I can think of, only that some new bikes have complicated electronics that you could possibly damage when connecting and disconnecting the leads ie when you see sparks, but I've done it many times over the years and you certainly won't hurt our old clunkers even with the new ignitions. Connecting it back to front might cause some issues, mainly blow up the leads/battery etc and will cause a nice bang!

Someone who shall remain nameless plugged an Ignitech in with the wrong polarity last time I was at Reds place (no it wasn't me or Red!) and it survived just fine.....
 
I have done it many times, even on modern bikes. My 2008 BMW R1200RT would not start a few weeks ago when it was below freezing and still has the original battery which is getting old and needing replacement. A 12 volt battery is a 12 volt battery is a 12 volt battery, regardless of what it is used for. A car battery is bigger and will produce more current but is the same thing!

Bruce
 
Our new all electronic car came with instructions on jump starting from another vehicle. Pretty sure it was just to connect the neg after the pos was connected which I?ve always done anyway. I doubt an electronic bike is different.
 
Mate of mine had a flat battery in his plane. Being a smarty pants car dealer he drove to work and grabbed a car battery and whacked it into the plane - sadly in reverse polarity and got to watch $10,000 worth of smoke escape. He never did make it that fishing trip.
 
The big issue with jumping from a car battery with the cars' engine running is taking the leads off.

This must be only done once the donor engine is switched off.  Damage is usually done to the donor though, resulting current peaks from detaching with the engine running can destroy any manner of on-board electronic equipement if insufficiently protected.  Once had my wind-screen wiper controls blow after giving start assistance...

Probably best to switch off both engines before detaching the leads, hoping the sick one will start again afterwards.

piet
 
You can get jumper leads with a surge suppressor built in that supposedly protects vulnerable electronics in modern cars.  I bought a set once for about $100. Dunno why (probably the victim of a good salesman) because all my vehicles are pre-computer stone age. The leads went through a clear plastic lump that had some electronic circuitry in it and a LED that lit up when connected to a battery. The surge arrestor sales pitch was probably a load of bollocks. Doesn't matter now anyway because I benevolently lent them to someone who I didn't know very well and haven't seen him or the fancy leads since.

Cam
 
The hard part would be getting the bike onto the car roof. Down hill after that. :D

                                                                                                      Dave       
 
I saw a boat do similar. Post long weekend traffic heading north out of Mandurah before the road became a split 2 lane each way jobbie. I was sitting in the servo at the Golden Bay turnoff with my cousin, both on Kwaka 900s, just eating a burgar and watching the constant flow of cars. One tosser decided to hit the brakes and turn into the servo at the last second, all the cars behind him slammed into each other including one towing a boat which immediately launched off its trailer and slid along the roofs of 3 or 4 cars in front of it before veering to the left and into a ditch. We left while the shouting and wailing was still going. Best thing I have ever seen on the road but.
 
Last time I jumped off a car I got a free helicopter ride.

I can also confirm it is really difficult to get a bike onto the car roof, bonnet is easy.
 
Never had a problem myself.
I had a battery problem with a Suzuki Burgman 650 scooter and they have an ECU for the Ignition and another ECU for the transmission.
It Jump Started......

Andy
 
Dellortoman said:
I once fell off the roof of a car while trying to ride a trials bike over it. I landed beside the car and the bike landed on top of me. Busted my ankle.
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That'll teach you. Was that a 5 or did you get away with a single dab?

                                                Dave
 
 
"Last time I jumped off a car I got a free helicopter ride."
Suppose you didn't quite pull off the double twist and reverse pike ;)

 
A definite 5. Probably a 6 because I couldn't walk away from it with a busted ankle - only hobble. It was way out in the bush (was an abandoned car) and I had to ride the bike back to civilisation. It was my left ankle so it was rather painful changing gears or putting any weight on the footpeg. I was with a mate who was rather  unsympathetic. He reckoned it was the funniest thing he'd seen for ages.
 
Terry Dymond said:
"Last time I jumped off a car I got a free helicopter ride."
Suppose you didn't quite pull off the double twist and reverse pike ;)
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never jumped off a car, but jumped out of the back of plenty of trucks moving at 20 kph with rifle and light kit - most of us finished up in a heap at first, but they made us practice until we got the hang of it
 
henry said:
never jumped off a car, but jumped out of the back of plenty of trucks moving at 20 kph with rifle and light kit - most of us finished up in a heap at first, but they made us practice until we got the hang of it
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Dad had a ute and we helped on his milk round.
Jump off the tailgate at about 15mph (25 kmh) with a bottle basket (10-12 bottles in each) in each hand, never once went over.  Trick is to be facing forward.
The old man was once standing on the tailgate and Marty (Bevelman's old RGS) sailed past the drop-off point.  The old man calls out "BRAKE!" so Marty obliges by jumping on the anchors and the old man ends upm with 3 broken ribs and a puctured lung, and 2 months incapacitated.  Who had to do the milk round for 2 months during year 11?  You guessed it.  Slept through 2 months of classes and failed abysmally.  Marty cost me an effing year, the prick  :)
 
springsoft said:
Dad had a ute and we helped on his milk round.
Jump off the tailgate at about 15mph (25 kmh) with a bottle basket (10-12 bottles in each) in each hand, never once went over.  Trick is to be facing forward.
Click to expand...

not in the south african army it wasn't - the idea was to have enough running speed to compensate for the speed of the vehicle. we used to file to behind the cab, turn and run like the clappers along the load bed over the open tailgate. if you aren't fast enough you fall over backwards when you land. holding the rifle as far forwards as possible as you landed, helped, we had the fn which is fairly heavy. usually, the stupid, overweight steel helmet would fall off backwards
 
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