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Discussion Starter #1
Went to start my bike the other day, key in the ignition and the dials sweep as normal, press starter button and the bike goes dead. Turn key off and on again, nothing! Lights don't work, dials don't move. The only thing which does still work is the clock.
I have checked the main fuses and the two extra fuses under the clear plastic cover and they are all ok. The battery is plugged into an optimate all the time and looks healthy when checked with voltmeter.
What should I check next???
 

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FORUM GODFATHER.....R.I.P. PAT
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The usual remedy is to clean and tighten the connections of the large battery wires. The connections to the battery itself are the usual culprits. There is a huge difference between passing enough current to activate a voltmeter and enough to run the bike. It happened to me about a month after I got my present bike. I just tightened the battery terminals and it's been fine for two years.
 

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Dissassemble and clean starter switch, open and check electrical connection behind the radiator, under the left front cowl, swear. kick bike....


bout all I got....
 

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FORUM GODFATHER.....R.I.P. PAT
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The next step is to check for voltage from the battery through the electrical system to find where the voltage stops registering.
 

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Discussion Starter #6
Well, what I have found out so far.
I played around yesterday trying to track down where the problem was, checked voltage on battery when started, 13v, good. Ignition on for 20-30 mins whilst stripping off electric start and following cables, checked battery again, nothing, dammit!
Got my brother in law round tonight and pinched the battery off his SV1000, started mine no probs, not a problem with the electrics then.
Swapped my battery back in and bump started it (damn that's hard work, took two of us pushing to get it started), got it stated but it doesn't seem to generating enough juice to power the bike electrics, the lights dim when revved and the dials go loopy.
Thinking it might be the alternator or maybe the battery?
 

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Well, what I have found out so far.

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Thinking it might be the alternator or maybe the battery?

Just go buy a new battery and see what it does. If his battery worked fine for yours, then I'm sure your battery is fried. The charging system on these bikes is very touchy; when you have a battery that doesn't charge or has a bad cell, It allows the voltage spikes to travel through the entire electrical system. Your computer detects these spikes and shuts the electronics down to protect the circuits, the battery is your bike's capacitor.

Go get a new battery and see what happens then.



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FORUM GODFATHER.....R.I.P. PAT
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Jyour computer detects these spikes and shuts the electronics down to protect the circuits
That doesn't happen. The ECM doesn't have that capacity. There is a theory a bad battery can lead to stator burn out because a lack of battery buffering can cause the regulator to shunt excess power into the stator. It's only a theory, but bad things can happen if a battery is not doing its job. Get the battery load tested or just replace it if it's old and you have the money. With a known good battery, put a voltmeter on the bike when you ride it and see if it shows over 13.5V over 3000 rpm. If not, your charging system has a problem such as a burned out stator or loose magnets.
 

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That doesn't happen. The ECM doesn't have that capacity. There is a theory a bad battery can lead to stator burn out because a lack of battery buffering can cause the regulator to shunt excess power into the stator. It's only a theory, but bad things can happen if a battery is not doing its job. Get the battery load tested or just replace it if it's old and you have the money. With a known good battery, put a voltmeter on the bike when you ride it and see if it shows over 13.5V over 3000 rpm. If not, your charging system has a problem such as a burned out stator or loose magnets.

You're right greywolf, still in my automotive mindset. Nevertheless, these electrical systems are sensitive and a bad battery is one of the biggest culprits to electrical issues, like you said, check the charging first with known good battery. Batteries are an easy problem to solve.


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Got my brother in law round tonight and pinched the battery off his SV1000, started mine no probs, not a problem with the electrics then.

Thinking it might be the alternator or maybe the battery?
Put the SV1000 battery back in it, start the bike, check the voltage. Should be 14-15. Run the bike until the fan comes on and check the voltage again. If your charging system is marginal the voltage could be dropping at operating temps.
 

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Discussion Starter #11
Put the SV1000 battery back in it, start the bike, check the voltage. Should be 14-15. Run the bike until the fan comes on and check the voltage again. If your charging system is marginal the voltage could be dropping at operating temps.
I've got a new battery on order. Will try this when it arrives
 
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