Quote:
Originally Posted by farqhuar
I honestly don't know the answer to that question, and I wish I did. If there any auto-electrical boffins on the site I'd be very pleased to hear from them.
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I'm not a boffin by any means and ,at the risk of being proven wrong ,would venture to say that ;
the battery has to supply some voltage to energise the alternator in order to produce a charge .
If battery voltage is too low , this will not happen ,the alternator will not provide sufficient charge and the battery will discharge itself quickly .Any momentary boost from another vehicle will only have a short lasting effect .On a modern bike and especially one with FI , you need a good battery -period - full stop .
If there were a permanent magnet alternator on the bike [which is self energising] you would PROBABLY be OK as the alternator would provide 14 v regardless of the battery condition and keep the bike running once you have found a way to get it started in the first place .
A battery with a bad cell will never charge successfully as it will always draw the good cells down to it's own voltage .
Theoretically ,I have never tried this , you could use some flashlight batteries to energise your alternator and then tow or bump start the bike .
After a long enough tow ,with the engine spinning over ,the system might reach the critical voltage for the FI to kick in and give it life .
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Blessed are the cracked, for they let in the light. - Spike Milligan
"When you come to a fork in the road ,take it ! When you come to a spoon in the road ,take that also ."
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