| Author | Message | ||
     Firemanjim |
I have a friends bike here and it showed no charge at the battery, ran tests and stator showed OK, so replaced the regulator with brand new, still the same??? Pulled and looked stator over and it looks good, another on order, but any other place to look??Connectors all look good. Is there an output test for the regulator I can run to make sure voltage going in is coming out? | ||
| Natexlh1000 |
Isn't there a big fuse between the output of the regulator and the battery? Like 40A or something? Also, unlikely but possible: new bad part? | ||
| Akbuell |
Reading from the Book Of Armorments, Chapter 2 - The Holy Hand Grenade . . . Oops, sorry, wrong movie. Anyway, the Buell 2008 XB Book Of Electrical Stuff says if the alternator assy passes the various ohm/continuity checks, then you should see 40-56V AC at the connector at 2000 RPM. Approx 20-28V AC per 1000 RPM. If so, it would appear that the voltage regulator/rectifier is the culpret. Or the wiring/connectors between are compromised, while appearing to be intact. The only test for the regulator I know is to run the engine at 2ish k RPM's and look for 13.5 - 15V DC at the battery terminals. Hope this helps, Dave | ||
| Akbuell |
Per Nate's post, there is a 30 amp fuse in the fuse/relay block. And if that has popped,the next question is Why? Out of the box failures are not unheard of, though not common. Edit: Looking at the wiring diagram again, it would appear that if the 30 amp battery fuse had blown, a lot of stuff would not work, including the engine wouldn't run. (Message edited by Akbuell on July 15, 2016) | ||
| Natexlh1000 |
Yeah that's only logical. No juice to the relays or anything else. | ||
| Firemanjim |
New stator and new regulator, still no charge, sure wish there was a way to check regulator---wiring appears intact. According to wiring diagram one wire from reg goes to ground the other to relay block.Anyone care to see if they get a voltage measurement from the connector out of reg-- mine says 3.8 volts????? | ||
| Jim2 |
To check regulator: http://racetechelectric.com/ft-751-voltage-regulat ors.html | ||
| Griffmeister |
I have not been able to test a regulator the way some of the web sites say to do, at least I have not gotten the right results even on a new reg. Something really does not sound right here. I also don't think you can read voltage off the reg output with it disconnected. I think it needs to "see" voltage before it will put out properly. As strange as this problem is, I would suggest maybe working backwards. Disconnect the regulator output plug. The bike end of the plug should basically be connected right to the battery. Yes, there is a fuse inline and there is a connection point at the frame ground, but for all intent and purpose this should be a direct link to the battery. Check voltage at this plug, it should read the same as at the battery terminals. If you can read proper voltage, try it again with a load. Hopefully you have something hanging around like an automotive headlight, or maybe you can parallel some tail light bulbs. Connect these to the bike side of the regulator output plug. If the light(s) shines brightly then you have good wiring right to the battery. If the light(s) dim then you have a wiring problem. After this it's just like Dave said. With everything connected normally, you should read battery voltage of 12.something right at the battery with the engine off. With the engine running, it should read about 14 volts. One way or another this problem should eventually show itself. | ||
| Firemanjim |
Bad connection at battery, could not see it but after testing as Griff suggested starting at the reg connector and worked back with ohm meter | ||
| Akbuell |
Excellent !!! Glad you found the problem. And thanks for letting us know; adds to the community knowledge. Swine battery connections . . . | ||
| Bdb_csiii |
Having charging issues as well on my '04 12R. Did a load test and got a reading of 31 volts at idle. Is that possible? Would the regulator be the culprit? | ||
| Firemanjim |
Volts AC?? | ||
| Bdb_csiii |
31 volts DC. | ||
| Griffmeister |
31 VDC, that is wild and will also "cook" more than just a headlight. Yeah, the alternator is capable of putting out some high voltage. Your regulator seems to be rectifying, but it sure isn't regulating. Might want to check the stator just to be sure before you hook up a new reg. |
