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Portero72
Posted on Sunday, September 16, 2018 - 06:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Question for the more electrically experienced here; I've lost power to both flyscreen and underseat accessory plugs. The fuses and relays check out fine, as I switched several around and nothing changed. Had the bike out for 100+ miles today and several hours, and except for no power to my GPS, all was well. Before I go tearing into the headstock grounds, anyone have some brilliant insight?

FWIW, it's an 08 with about 35k, and runs fantastic otherwise.
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Mark_weiss
Posted on Sunday, September 16, 2018 - 07:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well, on 08 and later, power to the accessory circuts is switched by the ECU. If battery voltage is low, the ECU will switch those circuits off.

(Message edited by Mark_weiss on September 16, 2018)
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Ratbuell
Posted on Sunday, September 16, 2018 - 10:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yep, low power cuts off the accessory outlet.

Got a voltmeter on the bike? Time for a battery and/or stator test...
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Portero72
Posted on Monday, September 17, 2018 - 07:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So....who's got two thumbs and is a total Dew Moss?

This guy. Carry on....

A closer inspection of the fuse showed a break that my initial glance missed. Duh.

Next question; What might cause that fuse to blow?
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Froggy
Posted on Monday, September 17, 2018 - 07:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Glad you've found it. I've started testing fuses with a meter to verify as I've had more than a few that were not obviously blown on first glance.

As for what caused it? I'd just put a new fuse in and see if blows again, if it doesn't I wouldn't worry about it, something could have been overdrawing, or got wet, etc.

If it keeps blowing, I'd disconnect everything related, and inspect all wires. Re-attach one by one and see if it blows again.
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Portero72
Posted on Tuesday, September 18, 2018 - 09:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Good ideas. Thx, Froggy.
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Ratbuell
Posted on Tuesday, September 18, 2018 - 09:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Do you have heated grips? The factory tapped that power outlet for the grip power, and the wiring incuded a Y-splitter so there's still an outlet behind the flyscreen for the GPS. So, possible plug-and-play connections to that circuit could be:
1. flyscreen cigar lighter outlet
2. underseat cigar lighter outlet
3. Heated grips
4. Buell P&A GPS mount

...and that's without cutting or splicing anything...
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Portero72
Posted on Thursday, September 20, 2018 - 07:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Rat-

You're a genius. I was gonna run power direct from the batter, but I'll poke around in there and see what I can do to avoid running more wire from back to front. Thx, brah!
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Teeps
Posted on Thursday, September 20, 2018 - 11:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Portero72 Posted on Monday, September 17, 2018
A closer inspection of the fuse showed a break that my initial glance missed. Duh.

Next question; What might cause that fuse to blow?


If the failure looks like a hair line crack; it could be from vibration, poor quality fuse, or heat cycle stress.
Make sure the fuse box terminals are clean and tightly grasp the spades of the fuse.
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