voltage issue

[bigrig]

2009 xb12 scg
6100 miles
i recently installed a voltmeter, when cruising is have steady 13.9-14.2
on occasion my headlight dims and the voltmeter will read 10.0-12.9 and throw a yellow check engine light.
the low voltage episode will last as long as 5 minutes and short as 5 seconds.
i ride it almost everyday.
it can happen in any gear or at any speed.
i do not having any problem starting the bike.
it does not stall or stutter at low rpm or when stopping.
i have checked the 4 ground wires behind the headlight and they are solid with no corrosion or wear.(thank you lunaticfringe)
link: http://www.buellxb.com/forum/showthr...ghlight=ground
i have LED turn signals front and rear with the relay mod, but this problem existed before i installed them
what could be the source of my issue?


*i searched and could not find an answer, if this has covered before please provide the link and i apologize.