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Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » Archive through December 15, 2014 » Rectifier/diode question 2008 xb12x « Previous Next »

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Dean
Posted on Wednesday, November 26, 2014 - 10:34 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

battery/ alternator tester says voltage regulator PASS
diodes FAIL
where are these diodes & how can i test/ replace em?
blowing headlights BTW
dean in tennessee
615 545 1111 texts ok
dean@learntoride.org
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Teeps
Posted on Wednesday, November 26, 2014 - 11:32 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The diodes are in the voltage regulator.
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Dean
Posted on Wednesday, November 26, 2014 - 02:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks Teeps. what causes failure of the diodes? shes only got 19k miles...
dean
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Tempest766
Posted on Wednesday, November 26, 2014 - 08:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

re: dean -- design/application flaw? Wondering if VR failure will end up a "common defect" similar to wheel bearings on the Uly. My VR went out at 22,000 miles. Low to mid-20k range seems to be when I'm reading of VR failures becoming more common.
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Mark_weiss
Posted on Wednesday, November 26, 2014 - 11:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The diodes make up the rectifier side of the rectifier/regulator unit. The purpose of the diode pairs is to convert AC power generated by the alternator into DC power that the bike can use.

There are two diodes for each "phase" of the alternator. In the case of '08 and later, we have single phase alternators so should have two diodes encased in the R/R unit.

Overheating and poor connections are the most common problems.

Still have to replace the regulator/rectifier as a unit.
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Dean
Posted on Thursday, November 27, 2014 - 10:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Happy Thanksgiving!
i've found loose ground at the steering head before & recently both battery cables ( after new battery install ).
guess i better start checking fasteners more often...
Dean
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Dean
Posted on Friday, November 28, 2014 - 02:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just replaced the voltage regulator & noticed my battery cables had loosened considerably in only 200 - 300 miles ...
It's a new battery ... Suggestions on keeping em snug?
Dean
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Griffmeister
Posted on Friday, November 28, 2014 - 10:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

How many terminals do you have attached to the battery? For example, have you added leads for a charger, maybe heated gear or other accessories? If so, try splicing all the leads into one pigtail so there is just one extra terminal to attach. If not, you could try putting a star washer between each surface to try and reduce the tendency to twist. Or pop the seat every 200 miles and torque the bolts.
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Dean
Posted on Monday, December 01, 2014 - 09:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

griff
i have a battery tender attached too...
i place the connectors under the cables - that may be the problem?
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Griffmeister
Posted on Monday, December 01, 2014 - 10:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The more terminals there are under that bolt the faster they'll loosen up. Sounds like you only have the main cable and a tender lead, that's not bad. A star washer between each lead might help, couldn't hurt. That reminds me, I need to check mine too.
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Dean
Posted on Tuesday, December 02, 2014 - 10:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I rode it 2 miles to o'reilly's this afternoon & tested the brand new voltage regulator & got the same FAIL on the diodes???
Hmmmm
Dean
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Reepicheep
Posted on Wednesday, December 03, 2014 - 07:54 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Effectively, there are no diodes. There is a voltage regulator, that is a black box. I think you have been lead down a rabbit hole (I've run down plenty myself).

Put a digital volt meter on the battery with the bike not running. Tell us what the voltage is. Then start the bike and measure again. Tell us what the voltage is.

That will probably clear it up.
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