Jump start bike with car? - Page 2 - SV650.org

17-01-11, 10:06 PM

Quote:

Originally Posted by TSM

i just clamp negative to bike frame and then leaves me only to deal with positive terminal while handling the battery for positive connectio

Thanks for that tip, didnt know I could do that.

Quote:

Originally Posted by beabert

I with sid squid on this one, you wont need to start it, but it will charge if the car was on.

It will? Handy to know

Hopefully it wont come to this, but sods law and all that.

Sid Squid · 17-01-11, 11:03 PM

Quote:

Originally Posted by TSM

you should not charge a bike battery with high current or it can damage the battery,

For the duration of a jump start it won't make any difference.

_Stretchie_ · 17-01-11, 11:16 PM

I've started the Thundercat loads of times from my 1.5 Civic and with the Civic running but not being revved.

But I was told to clamp the negative on the receiving (flat) vehicle to an earth point and not to the battery as it can upset engine management systems if present, and the Haynes book of lies backs that up, so that's what I do.

17-01-11, 11:20 PM

Dont try and start a bike while its connected to a battery charger though or you will blow a fuse in the battery charger. Or so i have been told...

TSM · 17-01-11, 11:21 PM

Quote:

Originally Posted by benji106

Dont try and start a bike while its connected to a battery charger though or you will blow a fuse in the battery charger. Or so i have been told...

never happened to me

17-01-11, 11:23 PM

Quote:

Originally Posted by benji106

Dont try and start a bike while its connected to a battery charger though or you will blow a fuse in the battery charger. Or so i have been told...

Lol. Unlucky

I'm nervous about my mot. Dunno why. I'm missing that rear numberplate reflector thing but hopefully he'll letme off.

Sid Squid · 17-01-11, 11:27 PM

The 'not connecting the neg lead to the battery' is a hangover from the days of unsealed batteries, there could be some flammable gas from the battery and if there were a spark on connecting the second lead - you do connect the leads in the right order, don't you?

Even if it were not for that, connecting the neg lead directly to, preferably, the engine ensures the least resistance in the jump circuit.

If connecting the neg jump lead to the battery made the electronics suffer so would connecting the lead to the frame/engine - the engine, battery, frame are directly connected together already, the engine and frame by being big metal things bolted together, and the battery has a fat lead that goes from the neg terminal to a bolt on the engine.

yorkie_chris · 17-01-11, 11:34 PM

Quote:

Originally Posted by Sid Squid

Care to explain why?

Explanation I heard that if your olde schoole shunt reg-rec was 'set' at say 13.8V and the car alternator regulated to put out 14.5V it could result in the reg-rec attempting to dump more excess energy than it was designed to and overheat it.

Bad luck, probably nothing bad happens in most cases, but plausible.

Sid Squid · 17-01-11, 11:51 PM

Honestly, I've tested this, and that was some years ago when such things were significantly less robust than they are now. We tried every combination of electronic and electro-mechanical device that could be found and could not make a unit fail using jump leads correctly from another vehicle.
Also I have never encountered a plausible story of failure in such circumstances, there are stories, but all that I have been faced with are accounted for with a very technical explanation: put the leads on the right way round. I will see if I can find the article into which all this testing went.
We even used two 12V batteries to apply 24V and couldn't make a regulator or electronic ignition unit fail. I really woudn't recommend that even though I know of someone on here who successfully jumped his SV from a tractor with a 24V system.

18-01-11, 12:44 AM

Quote:

Originally Posted by TSM

it will charge regardless anyway even with the car off as it will draw current from the car battery till its either full or balanced between
SidSquid will prolly write somthing far better to understand than me

I know that, but it was in reponse to your post saying it wouldn't lol.

17-01-11, 11:16 PM	#13
_Stretchie_ Large Member Mega Poster Join Date: Jan 2006 Location: Minsterworth, Gloucester Posts: 2,353	Re: Jump start bike with car? I've started the Thundercat loads of times from my 1.5 Civic and with the Civic running but not being revved. But I was told to clamp the negative on the receiving (flat) vehicle to an earth point and not to the battery as it can upset engine management systems if present, and the Haynes book of lies backs that up, so that's what I do. __________________ How to amuze an idiot: Look right-> <-Look Left

17-01-11, 11:20 PM	#14
benji106 Guest Posts: n/a	Re: Jump start bike with car? Dont try and start a bike while its connected to a battery charger though or you will blow a fuse in the battery charger. Or so i have been told...

17-01-11, 11:27 PM	#17
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: Jump start bike with car? The 'not connecting the neg lead to the battery' is a hangover from the days of unsealed batteries, there could be some flammable gas from the battery and if there were a spark on connecting the second lead - you do connect the leads in the right order, don't you? Even if it were not for that, connecting the neg lead directly to, preferably, the engine ensures the least resistance in the jump circuit. If connecting the neg jump lead to the battery made the electronics suffer so would connecting the lead to the frame/engine - the engine, battery, frame are directly connected together already, the engine and frame by being big metal things bolted together, and the battery has a fat lead that goes from the neg terminal to a bolt on the engine. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

17-01-11, 11:51 PM	#19
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: Jump start bike with car? Honestly, I've tested this, and that was some years ago when such things were significantly less robust than they are now. We tried every combination of electronic and electro-mechanical device that could be found and could not make a unit fail using jump leads correctly from another vehicle. Also I have never encountered a plausible story of failure in such circumstances, there are stories, but all that I have been faced with are accounted for with a very technical explanation: put the leads on the right way round. I will see if I can find the article into which all this testing went. We even used two 12V batteries to apply 24V and couldn't make a regulator or electronic ignition unit fail. I really woudn't recommend that even though I know of someone on here who successfully jumped his SV from a tractor with a 24V system. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst" Last edited by Sid Squid; 17-01-11 at 11:52 PM. Reason: Grammar, bad.

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