Front lights dim when shifting
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
rpms drop- less electrical power from charging system.
cables are always first check...try shaking the bike ( motor off) in the driveway.
could also indicate battery going bad.
the battery should have enough power stored to 'smooth out" fluctuations in power as the rpms change
if this is something you see in your rearview mirror, probably the focus point or "hot spot" of the lights rising and falling as he accelerates or decellerates
mike
cables are always first check...try shaking the bike ( motor off) in the driveway.
could also indicate battery going bad.
the battery should have enough power stored to 'smooth out" fluctuations in power as the rpms change
if this is something you see in your rearview mirror, probably the focus point or "hot spot" of the lights rising and falling as he accelerates or decellerates
mike
Club Member
Joined: Jun 2013
Posts: 6,386
Likes: 900
From: Columbus, Ohio
Right. When they're lose, they can't carry as much power. Kinda like unscrewing a water hose, but holding it under the spigot. Some water is still gonna get in there.
Seasoned HDF Member
Joined: Mar 2014
Posts: 15,363
Likes: 24,235
From: NC, USA
My 07 SG started that crap and it ended up being a fried Stator. Always start with the most logical and inexpensive route first, battery connections, battery status, loose wiring, then maybe go the voltage regulator and hope it isn't the stator.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
If there is any doubt about charging, go to the Tech Electrical section, where there are a couple of Stickies that will help diagnose the problem. Don't just replace stuff in hope! The usual other suspects to check out have been mentioned, but I would add main cable ground connections, plus connectors in the light supply wires.
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Outstanding HDF Member
Joined: Feb 2007
Posts: 2,976
Likes: 49
From: Northern California
be sure to check the grounds where they mount to the frame. I had the same issue years ago and this was it.
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Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
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From: SE Michigan
Thanks, where exactly?
