Hey guys, I know where I'm at..... I posted this in the electrical section yesterday and with no hits I thought I'd check your guys knowledge here cause I'm sure that the Dr. Or Bagger might be able to explain this. I have one idea that maybe a magnet shifted on the rotor or something.. The only difference really is single to three phase charging system between our Evo's and newer Twinkies... Thanks...

I'm working on my friends 2013 Road king classic w/103"motor. I never did much with newer bikes but lots of experience on Evo's and shovels, I'm more mechanical than Electrical... Anyway's The ECM set code P0562 and at times at idle the battery light would come on but only at idle. When I measure the voltage at the battery when running at idle I get 13.2-13.4v and at 2000 rpm I only get 13.7v and will not go higher no matter what rpm the motor is at.. The battery was just replace 2 weeks ago and it was the same as the old battery so I don't think the battery is the issue... He has never been stranded with a dead battery. The charging system seems to just barely keep up at 13.7 but shouldn't it reach at least 14.0-14.2v at 2000 rpm? When I did the ac test on the stator from pin 1-2, 2-3, and 1-3 at idle I get 16-17 vac and above 2000 rpm I get over 43 vac.. Also each winding is between .1-.2 ohm resistance and there are no shorts to ground. I have power to the Regulator and the ground is also good. Now for the code to set the voltage needs to drop below 13.2v I've never seen it drop below 13.2v but never seen it go above 13.7v either.. If it was the regulator that was no good I would think that I would get nothing to the battery except battery voltage itself and eventually a dead bike.... Any ideas would be helpful.. Thanx.

 

Hard to determine a bad battery...as age has zero to do with them... decent quality digital meter, and check that battery after it has sat unused for a day or two??? Static.
I should thing that the newer batteries [AGM and Better] would need a minimum of 14v applied to achieve full power capability... but, Remember that statically... 12.6 to 12.8 is "Good"... So I would be reluctant to loose any sleep over a Working [starts everytime] system...

 

Is there an AC voltage across the battery terminals with the engine running?

 

No there is not.. regulator is doing it's job...

 

Is this a history code that needs to be cleared? How many miles?

I think you already made the appropriate checks. Also, you can check forward and reverse diode testing of the regulator. I've read that 2012 Harleys had a bad batch of regulators, and your friend's 2013 may have one if it was early bike. If this issue has just started, my bet is the regulator is on its way out.

 

A bad diode would put an AC component at the battery...stated that was not happening.

 

When the problem is intermittent, the regulator can bench test good and even at idle. When it gets hot, that's when the intermittent issue comes into play. It's also important when the P0562 code was thrown. I think Harley's scanalyzer can tell you the point that this happens. That might help in the diagnosing of the problem. I'm sure glad I don't have codes to mess with on my old Evo.

 

Yeah that....

I met my friend back to the shop this morning. We cleared the codes yesterday so it definitely wasn't an old stored code.. 21k on the bike...This time the battery light and check engine light were on... Motor hot and we retested everything stator is 100% each phase was putting out a minimum of 16vac @idle and over 43 vac at 2000 rpm.... so I ordered a regulator. Never heard of an intermittent on a regulator but obviously when it's hot I'm only reading battery voltage which was the same key off or bike running... Thanx for helping out... Pretty confident that when the new regulator is in we'll be ok... I will update when completed... By the way I did do a resistance test where the power and ground pins are and one way it was infinite, reversed the probes and was reading a little over 5m ohm. not sure what it should be but I do know that the resistance was very high and I don't think it should read that high...Thanx again..

 

I say a rectifier diode... Pretty sure there are multiple diodes in the regulator. Regardless, gonna predict the replacement voltage regulator will fix the problem. YD

 

Installed the new regulator this morning and it's charging just fine.. 14.4- 14.6v.. thanks all..