Alternator light question, concerned about a voltage drop an alternator light starting to come on Options

[DRPHIL914]

I am about three hours into a 5 Hour Dr. on my way to Atlanta I just noticed a little while ago maybe 10 minutes ago a slight dim Flickr or glow from my alternator light also then looking at my voltage gauge which with my lights on normal he reads 11.5 V but it now reads 10.5 phones. Also at one point I hit a bump and the light disappeared in the voltage went back up to 11.5 but then after a few minutes the voltage drop again and the light is now on very faintly but it is so here’s my question what is the most likely cause is it a loose wire somewhere is it a loose belt those are the two most likely scenarios to me but if it’s a wire what should I look for I know I’m going to have to stop to look and right now I hit a bump** edited** as I’m driving right now and the light went out . So what light is most likely loose and causing this issue I’m going to have to stop and figure it out I guess thank you for the SAP help and responses in advance, Dr. Phil
I think you can see from this picture the light is on when I turn the other lights off you can see the faint glow of the alternator light and maybe even a little bit and the other picture with the lights on

[davep]

The alternator grounds through its case, then through the mounts and into the fan shroud. If there is too much paint then it is possible there is a poor connection. On the other end I had a problem where the ground stud for the battery strap was solid, but the car body did not carry the current well. I used a second ground strap from the battery post clamp to an existing hole in the fan shroud near the coil; 8mm bolt & nut. To check the state of the ground circuit use your voltmeter to see if there is a voltage drop from the alternator case to the negative post on the battery. You probably need about three people to do this; one each side of the engine and one to rev the engine to say 3000 to ensure maximum current is flowing. The voltage drop is proportional to the current flowing so you need to be creative; so turn on everything.
The glowing alternator light means the alternator is not generating enough voltage to equal the battery voltage; hence the battery is discharging. It may be generating some current but not enough to cover the loads, so the battery must make up the shortfall. The alternator light is a critical part of the charging circuit, and AFAIK there is no substitute for the original bulb.