Bike not charging when hot?

Started by MongoReturns, April 06, 2015, 04:53:05 PM

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MongoReturns

Hello, long time no real problems.

Sooo let's say I have a 2007 s4rs. Or whatever Monster from 2007 has a 1098 engine in it. Ahem.

I've always been paranoid about my VR, so I usually switch to volts on the dash when I'm standing still, and it's always been 14.1-4.  Until lately - usual business when it's cold; above around 160-170 the volts drop below 13 and keep dropping.  It goes up a bit when I rev, like to 13, but doesn't stay there as far as I know.  And I freak out and head home at all possible safe speed, before I lose enough volts to keep it running.  Battery seems fine, and is only a year or two old.  One of the VR connectors was covered in oil, and I thought this may be it, but I cleaned it off and obviously I still have the problem.  All of the other connectors/bolts seem fine.

I did see a post from 2010 (Howie inputting) pointing to the regulator, but no post re it worked.

Thoughts?

Thanks
2000Monster750Dark: cored pipes, stage2, 43t, f-18, dptach
2007 1098Red: home depot cooler guard, on sale cluch cover, on sale dp dark tall screen, ebay hugger, hand painted clutch spring caps

Howie

This will get you through:  http://www.electrosport.com/technical-resources/diagnosis-center/fault-finding-guide

DO check the connection between the stator and regulator (the three big yellow wires).  Oh, use a real meter for your tests.

brad black

this is my procedure.  be methodical.
Brad The Bike Boy

http://www.bikeboy.org

MongoReturns

I've skimmed that article before.  I imagine the procedure will work when the bike's cold?  It seems very strange I only have the problem when the bike gets hot.

Alternatively, I see my m750's vr has 6 wires coming out of it.  Would that thing work as a test?

I also realized yesterday I've had the 1098 for 11 years now.  Holy crap, when did that happen.
2000Monster750Dark: cored pipes, stage2, 43t, f-18, dptach
2007 1098Red: home depot cooler guard, on sale cluch cover, on sale dp dark tall screen, ebay hugger, hand painted clutch spring caps

Howie

Test when the problem is happening.  Bring a meter with you when on the road if needed.  You will need to work fast.  Good possibility you might just be dealing with a connection that developing resistance as the circuit becomes hot.  First thing I would do is check stator output.  Not because it is likely, just so you can rule it out.  Then the stator to regulator connection.  Don't forget grounds.  Do you know how to check resistance by voltage drop?

MongoReturns

I don't know how to check resistance by voltage drop (yet), but I'm sure I can figure it out. Using my 750 regulator not a good idea? Seems easiest (laziest). I sure hope it's not the stator.
2000Monster750Dark: cored pipes, stage2, 43t, f-18, dptach
2007 1098Red: home depot cooler guard, on sale cluch cover, on sale dp dark tall screen, ebay hugger, hand painted clutch spring caps

Howie

Might be a good idea if it is MOSFET (I think it is), I'm not familiar with the wiring though.  You still want to diagnose the real problem first though.  This should help you:  http://prod.lv2014.integr8cms.net/index.php/70-disc-brakes/section-7/battscs/803-testing-charging-system-circuit-voltage-drop  The idea is you are measuring voltage consumed under load due to resistance (wire or connection) or load (bulb, motor, resistor etc.).  Also a video: 


brad black

get it hot until it falls over, then check it out.

if the m750 is an old single phase system then no, the reg won't work.  if it is a 3 phase it's the same reg, and should look the same.
Brad The Bike Boy

http://www.bikeboy.org

MongoReturns

Update, took the fairing off for the 1000th time again, and wtf the connector had oil on it, again.  The only possible explanation is there was some oil in the sheath covering the yellow wires, and it dribbled back on/in there.  Anyway gave both connectors a good cleaning (hmm degreaser hanging around the house... windex?  maybe.  Brake cleaner?  Yeah we'll go with that despite the plastic warnings).

Cleaned them off, it started up barely and I took off on a one fairing ghetto ride.  Insert Two-face image. Heated it up repeatedly, fine.  219f, fine, fans came on as they should.  Sat there and stared at it with the dash on volts, fine, 14.1-3  Annoyed all neighbors in a 4 block radius I'm sure.

I swear if I put the fairing back on (like 11 screws) and it happens again I WILL NOT BE PLEASED.  Also, checked out the monster's regulator in anticipation of a swap, same wires and connectors.  Just longer wires.

So hopefully the moral of this story is oil on connectors equals no longer connections.
2000Monster750Dark: cored pipes, stage2, 43t, f-18, dptach
2007 1098Red: home depot cooler guard, on sale cluch cover, on sale dp dark tall screen, ebay hugger, hand painted clutch spring caps

brad black

pity you didn't tell us it was a 1098 at the start.  it really shits me when you waste time typing stuff that would have been better spent typing specific info for the actual bike in question.
Brad The Bike Boy

http://www.bikeboy.org

ducpainter

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CDawg

#11
FWIW--My voltage regulator busted on me last summer.  If was overcharging the battery (li-ion) which was causing the battery to shut down.  This only happened at higher revs.

Shop told me that they have seen a few work out regulators on the S4RS.