Voltage light (LED)

[rodneym]

I've been running my Kirkham nights lately. I noticed a slight dimming and an increase in brightness in the headlights when gassed. With the lights and fan in traffic, I was afraid I wasnt charging the battery enough (Odyssey 925).
Then I go out yesterday and she started on the first try but barely, and the Voltage light (on the Voltage gauge) came on and never went off. I figured I'd drive it around to charge it. As the engine warmed up, I turned the fan on and it dropped from high 13's to mid 12.
This morning I figured I'd charge the battery and look for loose grounds. The charger showed 'almost fully charged' to begin with. My handheld digital voltmeter read 12.75 after the charge. Stupid me didn't check before hand. I also found the kill switch cables to be VERY loose. Bingo! I checked them on delivery but they really loosened up A LOT! I tightened those tight. The battery was tight, the voltage regulator is all connected good and grounded on bare chassis. The alternator lead is tight, (still a couple more places to check when I put in on ramps). I thought all was well due to the loose kill switch cables.
I took it out for a spin. Started great. Read over 14V. When I had to kick on the fans it dipped for a split second to 12 but came back up to high 13 in a heartbeat. Drove fine. After the drive the battery read 12.94. With the kill switch killed, 0.0.
BUT the Voltage light was still on during my entire last drive??
Advice?

rodneym