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cb1rocket |
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cb1rocket World Chat Champion
Joined: 30 Jan 2010 Karma :
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Posted: 12:04 - 09 Aug 2018 Post subject: Charging Fault various Hondas |
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I have come accross two Honda's in my time that have thrown up a really weird charging fualt.
Honda S-Wing 125 2009.
Symptom: won't charge at idle unless I take headlight bulb out.
Honda Varadero 125 2005
Symptom: again the same thing, take out the bulb or clocks power lead and it charges fine.
On both bikes with everything connected the voltage is a miserable 11.9 to 12.3v and eventually the bike cuts out.
When something is disconnected ie a load taken off the electric circuit the power jumps to a healthy 13.2 volts and 14.5ish when rev'ed.
On both bikes I have changed the reg/rec, checked the alternator output, changed the stator and I'm still at a loss. I even went as far to check earths and check resistance. I even went far to mock up a new wiring direct from genny to reg/rec to eliminate poor wiring.
It seems that there is an excessive load on the electric (or maybe not) but if rev'ed and held there i get reasonable charge but it's pointless and unrideable.
What do I check next?
I have changed and swapped everything bar the rotor, even went far to change the stator 3 times on the s-wing even with a new one, no difference. ____________________ Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852 |
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Kawasaki Jimbo |
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Kawasaki Jimbo World Chat Champion
Joined: 09 Oct 2015 Karma :
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rpsmith79 |
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rpsmith79 World Chat Champion
Joined: 31 Jan 2017 Karma :
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 14:53 - 09 Aug 2018 Post subject: |
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As above, bikes don't charge at idle.
Also. Where are you measuring the voltage? It will be different in different places.
I have a voltmeter on my VFR750, I get just under 12v at idle with the headlight on, 11.2 with the grips on too at idle. It sits at a steady 13.6 when being ridden, droping to 12.8 with the grips.
I know the drop for the grips is artificially large because the voltmeter is on the relay controlling the grips.
I suspect you may be disconnecting the "sense" wire from your reg/rec (that monitors the actual loom voltage on a switched live, usually a black wire) so it is not regulating the output. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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cb1rocket |
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cb1rocket World Chat Champion
Joined: 30 Jan 2010 Karma :
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Posted: 15:48 - 09 Aug 2018 Post subject: |
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Ok well i agree and disagree. I have had another s-wing and looking into that the voltage is alot higher than the faulty s-wing.
Remember this is a always lights on model. The voltage gradually drops ands drop after 5 mins of idling cuts out.
The other s-wing doesn't cut at all and will maintain steady volts.
Agreed the volts won't rise unless revving but even at idle there is always some charge coming through to battery. The revs also fluctuate badly at idle but goes away when rev'ed.
My own scooter Honda Pantheon 125 charges and will idle happily forever. I had it running for a good 30 mins at idle while i was working on another bike. The s-wing cuts out less than 5 mins on a fully charged battery. Even swapping the battery out from a good scoot yields the same results ____________________ Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852
Last edited by cb1rocket on 15:56 - 09 Aug 2018; edited 1 time in total |
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rpsmith79 |
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rpsmith79 World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 16:16 - 09 Aug 2018 Post subject: |
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I'd expect a fully charged s-wing battery (7Ah) to run the bike with the lights on for at least an hour with no charging system at all.
So either there is a partial short circuit draining your battery or the battery is duff. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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cb1rocket |
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cb1rocket World Chat Champion
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cb1rocket |
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cb1rocket World Chat Champion
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Posted: 16:39 - 09 Aug 2018 Post subject: |
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What also baffles me is when i take a bulb out i get acceptable charge as per my working bike and will happily tickover for ages? Something points to a short or a genny that is not powering the minimum voltage at idle?
It's clearly a problem otherwise I wouldn't be asking the BCF massive ____________________ Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852 |
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Kawasaki Jimbo |
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Kawasaki Jimbo World Chat Champion
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stinkwheel |
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stinkwheel Bovine Proctologist
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cb1rocket |
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cb1rocket World Chat Champion
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Posted: 17:59 - 10 Aug 2018 Post subject: |
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Stator checked for resistance about 4 ohms And ground is open circuit.
Clamp meter sounds a good idea or they generally unreliable? ____________________ Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852 |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 19:02 - 10 Aug 2018 Post subject: |
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Depends on the meter. They are generally accurate enough though. Better for larger currents but also much more convenient in terms of use. You can also use one to see if there is current flowing in a particular wire. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Old Thread Alert!
The last post was made 5 years, 252 days ago. Instead of replying here, would creating a new thread be more useful? |
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