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Topic: Myth busted: Jump-starting your bike from a car battery  (Read 4393 times)
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« Reply #20 on: June 30, 2009, 06:14:37 PM »
Does anyone understand what this duck is saying?  Headscratch
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« Reply #20 on: June 30, 2009, 06:14:37 PM »
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« Reply #21 on: June 30, 2009, 06:26:27 PM »
Quote from: Leanintree on June 30, 2009, 12:29:48 PM



Oh, and given a choice, not off of a pickup, particularly a 3/4-1ton that might be packing a spare battery in series. Always jump a bike off of the smallest battery available.
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Umm..that would be a 24v system wouldn't it??
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« Reply #22 on: June 30, 2009, 06:50:42 PM »
Quote from: Heaven Bound on June 30, 2009, 06:29:05 PM

He meant to say in parallel...but you are correct, series would make it 24v.


Yes, you are correct Smile
on the other hand it doesn't matter if it has 1,2, or 10 batteries. As long as they are connect parallel and the engine is not running you are going to get somewhere between 12-13 volts. 12 volts is 12 volts Wink (remembering that if the engine is running you are running somewhere around 14+ Smile) It's really not as magical as it seems.
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« Reply #23 on: July 01, 2009, 06:08:24 AM »
I wasted the rectifier in my bike by jumping from running cars.  It's not a myth to me.
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« Reply #24 on: July 01, 2009, 07:52:36 AM »
Quote from: 1KPerDay on June 30, 2009, 06:14:37 PM

Does anyone understand what this duck is saying?  Headscratch


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« Reply #25 on: July 01, 2009, 07:58:04 AM »
I've replaced a few ECMs that died coincidentally  Rolleyes  when they attached a jumper cable from a running car.Do yourself a favor when jumping an FI bike.Attach the cables with the bikes ignition off and the ECM fuse disconnected.ECMs are not cheap.
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« Reply #26 on: July 01, 2009, 08:42:42 AM »
Quote from: thatguy on July 01, 2009, 07:58:04 AM

I've replaced a few ECMs that died coincidentally  Rolleyes  when they attached a jumper cable from a running car.Do yourself a favor when jumping an FI bike.Attach the cables with the bikes ignition off and the ECM fuse disconnected.ECMs are not cheap.


Will a modern FI bike even start withouth the ECM?  Headscratch  ECM stands for Engine Control Module, right?
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« Reply #26 on: July 01, 2009, 08:42:42 AM »

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« Reply #27 on: July 01, 2009, 09:17:27 AM »
No they won't.Yes it does.I meant only during the connection phase.You'll need to reinstall the fuse to start it.Every training class I've attended stresses voltage spikes,no matter how small the total can be fatal to an ECM.
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« Reply #28 on: July 01, 2009, 12:50:09 PM »
Car not running never had a problem been doing it for years. I don't think there is a need for the car to be running, plenty of juice with a car battery.
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« Reply #29 on: July 01, 2009, 02:45:58 PM »
Okay, lots of talk about jumping using a running car?

Who here (raise your hand) thinks this makes ANY sense to do?  Bueller?  Your car isn't designed such that the engine needs to be running to...start its own engine!  Lmao

Just hook it up to a car battery, start the damn bike, disconnect.  End of thread. Lol  Sheesh.
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« Reply #30 on: July 01, 2009, 02:46:43 PM »
Or ride your bike often enough to keep the battery charged. Or buy a battery tender. Lol
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« Reply #31 on: July 01, 2009, 05:04:42 PM »
Or push start it.
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« Reply #32 on: July 01, 2009, 07:36:52 PM »
Quote from: basco on July 01, 2009, 05:04:42 PM

Or push start it.


That's REALLY not as much fun as it sounds if you happen to ride a boat-anchor...
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« Reply #33 on: July 01, 2009, 07:43:15 PM »
Quote from: Leanintree on July 01, 2009, 07:36:52 PM



That's REALLY not as much fun as it sounds if you happen to ride a boat-anchor...


Not sure what qualifies as a boat anchor, but I've had no trouble bump starting the following:

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« Reply #33 on: July 01, 2009, 07:43:15 PM »

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« Reply #34 on: July 01, 2009, 08:57:28 PM »
Quote from: 1KPerDay on June 30, 2009, 10:39:31 AM

If I have to jump from a car battery I do it with the car not running. The battery alone will have enough juice to jump the bike. Someone told me once there's less chance of trouble this way; dunno if it's true but I have perpetuated that belief.


Doesn't matter...I'd do it with the car running so I can make sure to recharge my car battery so I can start it later.
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« Reply #35 on: July 02, 2009, 08:40:58 AM »
Quote from: Mr Sunshine on July 01, 2009, 08:57:28 PM



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« Reply #36 on: July 02, 2009, 10:00:45 AM »
I was a bit concerned about jumping my new R1200RT as I figured that any BMW must have some sort of sensitive electronic something that will fry if shown booster cables.  But the manual has only a one-liner warning, "jump from a battery with the same voltage as the bike".  So, as has been said, there should be no issues jumping a bike from a 12 v system.  But, as has also been said, a running car will be putting out about 15.2 v and could cause some issues.  If you are worried, you can always take the "surface charge" off of a car battery by turning on the lights or running the fan motor for a second before you hook the battery up to your bike.  This will pretty much ensure that you are boosting with 12 volts.  
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« Reply #37 on: July 02, 2009, 12:10:19 PM »
Quote from: 1KPerDay on June 30, 2009, 06:14:37 PM

Does anyone understand what this duck is saying?  Headscratch


Yup.  And I agree with him, especially on ECM equipped bikes.  Even cars are more and more susceptible to over-volts from car starting units-a fact of life in the Great White North.
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« Reply #38 on: July 03, 2009, 08:07:55 PM »
at the bike shop we had a 1500 CCA battery jumper, used it hundreds if not thousands of times.  That is double, if not triple the capacity of most car batteries.

Cars running shouldn't make a difference, but then, I can't imagine why you would do it to begin with.

IMO, I think most 'stories' about things blowing up is people simply getting the polarity wrong.  I can't tell you how many times, both cars and bikes, we had to repair damage for that (although they rarely admit it at first)

The story is always the same...."so anyway, A FRIEND OF MINE went to jump the bike/car and...."
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« Reply #39 on: July 03, 2009, 11:17:18 PM »
Quote from: 1KPerDay on July 01, 2009, 02:46:43 PM

Or ride your bike often enough to keep the battery charged. Or buy a battery tender. Lol


What he said.
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