Test Voltage Regulator 2007 Dyna FXDL
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Cruiser
Joined: May 2009
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Test Voltage Regulator 2007 Dyna FXDL
Anyone know how to test voltage Regulator that has been removed from motorcycle.
I believe it is causing my battery to drain.
If faulty will install new form cycle electric as they truly regulate the voltage and not dump it to ground as Harley OEM do.
Any help with testing most appreciated.
I believe it is causing my battery to drain.
If faulty will install new form cycle electric as they truly regulate the voltage and not dump it to ground as Harley OEM do.
Any help with testing most appreciated.
Stellar HDF Member
Joined: May 2010
Posts: 2,864
Likes: 127
From: Aussie lost in Switzerland
Test each winding of the voltage reg by switching your meter to OHMS, and switched to around 2 K ohms. at the plug there are 3 wires, test from one to the other 2 in turn, then switch to another wire and test between it and the other 2, then repeat on the third.
Meter will tell you if you have an open or short in any winding.
Meter will tell you if you have an open or short in any winding.
Elite HDF Member
Joined: Sep 2008
Posts: 4,440
Likes: 148
From: Northwest
Test each winding of the voltage reg by switching your meter to OHMS, and switched to around 2 K ohms. at the plug there are 3 wires, test from one to the other 2 in turn, then switch to another wire and test between it and the other 2, then repeat on the third.
Meter will tell you if you have an open or short in any winding.
Meter will tell you if you have an open or short in any winding.
There's not much you can do on the bench to test the regulator. Not unless you can generate around 36vac-2-3phase. As Krazy describes above, is the test for the alternator.
Best way to test regulator(and alternator at the same time) start the bike, and check to see that you have at least 14vdc when measured at the battery when running. You may need to kick it up off a idle a little bit. If you have that, your alt/reg are probably okay. If you don't have it, either of those are bad... and generally the reg is sacrificed the same time the alt goes out.
With the bike sitting and not running, measure the battery voltage... it should be above 11.5... if it's not... you probably have a dead or dying cell... time for new battery.
Intermediate
Joined: Jun 2018
Posts: 41
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From: PA
I also have a 2007 Dyna FXDL just got it a few weeks ago any input you can give would be appreciated...I get a lot of vibration when riding the vibration goes away if i am on the throttle any insight to that ? My 2007 has 21K I have changed the oil in all 3 holes replaced the front motor mount, clutch adjustment and cleaned a lot of chrome
Regards,
Dewking
Regards,
Dewking
Elite HDF Member
Joined: Sep 2008
Posts: 4,440
Likes: 148
From: Northwest
I also have a 2007 Dyna FXDL just got it a few weeks ago any input you can give would be appreciated...I get a lot of vibration when riding the vibration goes away if i am on the throttle any insight to that ? My 2007 has 21K I have changed the oil in all 3 holes replaced the front motor mount, clutch adjustment and cleaned a lot of chrome
Regards,
Dewking
Regards,
Dewking
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Cruiser
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Diesel2 here. As for VR it was putting out some 13.87 volts measured off the battery before I removed it for testing. Let the bike sit for 15 days, reinstalled the VR and bike started wright up and volts now at 14.27 measuring off the 40 amp main fuse, not the battery. Should be I would think both show same. The system is charging the battery no problem. The problem is parasitic draw which I believe to be the VR.
My question is with the VR in the system 15 days or so battery dead and bike won't start. Measured at the 3 prongs on VR and was showing 11 volts or so with bike off. Now with the VR completely removed the battery after the same amount of time stayed charged and with the VR back started the bike wright up, no problem.
So it is the VR back feeding voltage and draining the Battery, in other words the diodes are not checking the voltage by allowing it to back feed to the stator. Diodes are to allow voltage from stator to feed the battery and not allow any voltage to feed back to the stator. The system is I know 3 phase AC and the rectifier in VR changes it to DC. Also I would think it would turn the stator into a electric heater and burn it out in time if in fact back feeding.
Hope my testing etc., and write up here makes sense.
For sure I no electrical expert, but sure seems to me the VR at fault????
Any help most appreciated.
My question is with the VR in the system 15 days or so battery dead and bike won't start. Measured at the 3 prongs on VR and was showing 11 volts or so with bike off. Now with the VR completely removed the battery after the same amount of time stayed charged and with the VR back started the bike wright up, no problem.
So it is the VR back feeding voltage and draining the Battery, in other words the diodes are not checking the voltage by allowing it to back feed to the stator. Diodes are to allow voltage from stator to feed the battery and not allow any voltage to feed back to the stator. The system is I know 3 phase AC and the rectifier in VR changes it to DC. Also I would think it would turn the stator into a electric heater and burn it out in time if in fact back feeding.
Hope my testing etc., and write up here makes sense.
For sure I no electrical expert, but sure seems to me the VR at fault????
Any help most appreciated.
Last edited by Diesel2; Jul 5, 2018 at 06:29 AM.
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Elite HDF Member
Joined: Sep 2008
Posts: 4,440
Likes: 148
From: Northwest
Diesel2 here. As for VR it was putting out some 13.87 volts measured off the battery before I removed it for testing. Let the bike sit for 15 days, reinstalled the VR and bike started wright up and volts now at 14.27 measuring off the 40 amp main fuse, not the battery. Should be I would think both show same. The system is charging the battery no problem. The problem is parasitic draw which I believe to be the VR.
My question is with the VR in the system 15 days or so battery dead and bike won't start. Measured at the 3 prongs on VR and was showing 11 volts or so with bike off. Now with the VR completely removed the battery after the same amount of time stayed charged and with the VR back started the bike wright up, no problem.
So it is the VR back feeding voltage and draining the Battery, in other words the diodes are not checking the voltage by allowing it to back feed to the stator. Diodes are to allow voltage from stator to feed the battery and not allow any voltage to feed back to the stator. The system is I know 3 phase AC and the rectifier in VR changes it to DC. Also I would think it would turn the stator into a electric heater and burn it out in time if in fact back feeding.
Hope my testing etc., and write up here makes sense.
For sure I no electrical expert, but sure seems to me the VR at fault????
Any help most appreciated.
My question is with the VR in the system 15 days or so battery dead and bike won't start. Measured at the 3 prongs on VR and was showing 11 volts or so with bike off. Now with the VR completely removed the battery after the same amount of time stayed charged and with the VR back started the bike wright up, no problem.
So it is the VR back feeding voltage and draining the Battery, in other words the diodes are not checking the voltage by allowing it to back feed to the stator. Diodes are to allow voltage from stator to feed the battery and not allow any voltage to feed back to the stator. The system is I know 3 phase AC and the rectifier in VR changes it to DC. Also I would think it would turn the stator into a electric heater and burn it out in time if in fact back feeding.
Hope my testing etc., and write up here makes sense.
For sure I no electrical expert, but sure seems to me the VR at fault????
Any help most appreciated.
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