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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Electrical - Battery, Charg Sys, Lights, Switches, Sensors & Guages » 2007 XB12R throwing codes, blowing fuses « Previous Next »

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Dwilson14
Posted on Saturday, April 13, 2019 - 04:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey guys, newbie here to the site and Buell ownership. I bought my Firebolt in 2018 and rode it all summer with only minor issues, but everything I thought I had resolved is now back! Hereís the symptoms:
1 keeps blowing the cooling fan fuse
2 keeps burning out the low beam headlight
3 after replacing the battery, I got a trouble code for battery voltage
The codes itís throwing are 36, 16, and 21

Now after some reading I discovered the infamous Ď77í connector, so my first thought is to inspect and clean the crap out of it and see if that helps. Anyone have any other thoughts on my predicament?
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Dwilson14
Posted on Saturday, April 13, 2019 - 08:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

*update* so I did some looking, the 77 connector appears to be fine, what I did find was one of my stator leads in the 44? Connector was half burned up! BUT the stator passes all the electrical checks, around 4 ohms from pole to pole, all poles isolated from ground (or frame in this case) and around 20V AC from pole to pole at idle (1000rpm or so) if I can replace just that plug hopefully thatís one thing to scratch off the list! Also, when I unplugged the stator to do the voltage check, I also replaced the cooling fan fuse (again) and all my trouble codes cleared! Wtf -over-
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Tpehak
Posted on Sunday, April 21, 2019 - 12:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

First of all find and download 2007 Buell XB Electrical Diagnostic Manual for your 2007 Buell XB.

Assuming you performed stator test and it is OK you have to perform next two things:

1) You have to perform voltage regulator test according the manual (it might cause voltage flustuating above and below the limits due to internal malfunction of the voltage regulator, or shortened wires, or shortened plug, or bad connection in the plug). Voltage regulator has two plugs - one connects it to the stator and another connects it to the battery.

2) You have to perform cooling fan test following the manual (it might have shortened coils, or shortened wires, or shortened wire on the ground, or something shortened in the fan plug, or shortened fan wires in the main harness, or something shortened in the cooling fan electrical circuit. Or cooling fan can have big rotational resistance because of dirty bearing, or dirty blades or something else).

To perform those tests you just need multimeter and fully charged battery.

Make sure battery terminals and all grounds on the motorcycle are clean and tight.

I also highly recommend you to install voltmeter gauge on you motorcycle to monitor what is happening there. Sometimes bad VR can work OK during test confusing you, but it occasionally can deliver voltage spikes or can stop charging battery. So if you can see voltage during your ride you can catch that moment. Otherwise you will think VR is OK because of it passed test, but it might be not.

Voltmeter gauge is the best gauge on you motorcycle after oil pressure signal. On the Buells with their crappy electric system it is must have gadget.


https://www.buellxb.com/forum/showthread.php?52809-Micro-voltmeter-in-handlebar-control-housing


(Message edited by TPEHAK on April 21, 2019)
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