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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Electrical - Battery, Charg Sys, Lights, Switches, Sensors & Guages » Archive through February 23, 2011 » Instument panel dims then gets bright « Previous Next »

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Dastoney1
Posted on Tuesday, November 30, 2010 - 08:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Panel dimming, fan sounds strong then weak
Horn weak sometimes, bike runs weak, eating batteries up!! Can someone give me advice
I'm at wits end!!!
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Terrys1980
Posted on Tuesday, November 30, 2010 - 11:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
The easiest thing to do would be to get the service manual and go through the current and voltage output diagnostics.

1. Fully charge battery.
2. Check current draw with bike off(2mA) and on(35A).
3. Check stator resistance.
4. Check stator output. Run the engine at 2000 RPM. The AC output should
be 32-40 volts AC. (approximately 16-20 volts per
1000 RPM).

Stator connector is behind the sprocket cover.
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Terrys1980
Posted on Tuesday, November 30, 2010 - 11:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Alternator Does Not Charge
1. Regulator-rectifier module not functioning.
2. Rectifier not grounded.
3. Engine ground wire loose or broken.
4. Loose or broken wires in charging circuit.
5. Stator not functioning.
6. Rotor not functioning.

Alternator Charge Rate Is Below Normal
1. Regulator-rectifier module not functioning.
2. Stator not functioning.
3. Rotor not functioning.
4. Weak battery.
5. Loose connections.
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Dastoney1
Posted on Tuesday, November 30, 2010 - 01:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Thanks for the help
I really appreciate this!!
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Froggy
Posted on Tuesday, November 30, 2010 - 01:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
First thing I'd check is the 77 connector, it is #4 on the picture above. It is common issue on the 03-07 bikes to have poor contact, it would cause arcing and as result melts the connector.
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Dastoney1
Posted on Thursday, December 09, 2010 - 06:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
It was the voltage regulator!
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Terrys1980
Posted on Thursday, December 09, 2010 - 07:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Glad you figured it out. Just hope its not on back order.
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