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Gen 2 charging woes |
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MikeyR
Moto3 racer Joined: 12 May 2020 Location: Melksham Status: Offline Points: 73 |
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Posted: 17 May 2021 at 21:07 |
Evening All,
I know everyone will be shouting stator at the screen but hear me out first please....it may of course still turn out to be that. Looking for additional checking guidance please. Gen 2 Factory, 57 plate, 14TZZ battery, John Walker leads, always shows 14.2v at idle on both dash & multimeter. Habit means I always check the voltage when starting up waiting for the apparently inevitable. A couple of days ago I did a double take when bike was warming up, 13.6v and dropping to 12.4 over about 5 mins. Switch off, charge, repeat and this time it just hovers around 12.4. When I rev to about 3K, voltage increase to 13.1v. What I've checked is: - Brown & white connectors on reg rec- all good, no burning, damage etc - Voltage across all 3 phases consistent - 27vac at idle, 58vac at 3K revs - checked several times. - 0.4 ohm resistance, consistent across all 3 phases - Phases to earth - all good - RR Diodes - consistent open & closed in right directions - Connectors under seat pillion good, 30A connections good - rechecked all + & - connections on engine - all good - With 1 multimeter on battery & 2nd on white reg rec connector - same voltage readings on both meters with engine on (12.4) & off (12.6) so appears to be no losses in loom. - To me it appears at idle battery is draining but higher revs creates some charge although low. Stator values look OK, so must be reg rec! Swapped RR but NO, same voltages throughout as before. Nothing appears obviously stuffed. I'm no mechanic or sparky and have quickly run out of limited talent here, anybody have any other checks I could make?? Thanks.
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Prsv
Premium Member Joined: 29 Jan 2016 Location: Fareham Status: Offline Points: 555 |
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How old is battery maybe not accepting charge everything else seems good.
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davidrsurfer
Premium Member Joined: 22 Feb 2011 Location: North Devon Status: Offline Points: 2511 |
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Not convinced its output is enough. Might be worth having the alternator cover off for a look see, any Black coils will confirm the stator toasted.
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Motorcycle friendly self catering holiday apartment Acorn Studio. See us at Air bnb.
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legend88
Premium Member Joined: 18 Aug 2013 Location: Newcastle Status: Offline Points: 6598 |
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Yep, you should expect more than 13V at 3K
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MikeyR
Moto3 racer Joined: 12 May 2020 Location: Melksham Status: Offline Points: 73 |
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Thanks all,
Forgot to mention I'd tried another known good battery and all readings are the same as T's battery so had really dismissed the battery, although that may not be 100% conclusive. Agreed 13v is too low, it's always been 14.2 at tickover, it's the sudden voltage drop cause I'm lost with. Spoke to Griff, he felt the stator voltages were good and consistent and thought it heavily indicated the RR - of course he hasn't got the bike in front of him so his advice is appreciated but can only be limited over the phone. Changed the RR and no different. My small brain thought good AC voltage into RR meaning stator good, poor RR DC output, connections and wiring good therefore RR isn't controlling voltage properly and is failing. Maybe time to look at the stator itself.....unless anyone's had similar issue and has some other aspects to check...
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Bladerunner919
Premium Member Joined: 19 Mar 2020 Location: Bracknell Status: Offline Points: 376 |
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I think your logic is good. I'm not sure what the output connector at the RR is like, but can you get a multimeter in to take a voltage reading? If so, do one reading across the +ve and -ve at the RR and another between the +ve at the RR and the frame of the bike, just to see if there is a significant difference.
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MikeyR
Moto3 racer Joined: 12 May 2020 Location: Melksham Status: Offline Points: 73 |
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Well I think I've found the issue but gotta check properly by hooking the stator out. Went over again with the meter and this time as before across all 3 phases there was 0.5 Ohms, that's pretty normal. Then checked each phase to earth, body & battery, this time now showing 0.5 Ohm too which I read as the stator now grounding, is that correct?. Very odd as it showed no reading to earth before when checked so I thought the stator OK, but I guess I must have checked it just as it's failing started and now it's dead.
Is the stator one of those items best bought genuine? Will I need to sit down when pricing it Thanks for the input all.
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426hemi
Premium Member owner of the big bore! Joined: 30 Mar 2012 Location: cannock Status: Offline Points: 5676 |
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Most people tend to upgrade them with a mosfet reg rec, you can get them for about £120 upwards.
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