bad alternator or short to ground?

[rps13drift]

So i recently trailored my car to a local drift event after not realy driving it for the whole winter/spring months due to moving and a few motor upgrades and it sarted acting super weird. When I start the car my volt gauge shows 11 volts but as soon as I blip the throttle it goes up to 14 volts??? wich Is good! I can drive the car all day but as soon as a light is activated(headlight/tail/brake) my volts drop to like 9 ? Does this sound like a bad circuit in my wiring or can my alternator not take any load from those accesories? I went over all the grounds and they seem clean and good. I also diconnected the battery while it was running and it didnt stall or anything.

[KiLLeR2001]

id get your battery tested just to be sure its not that. Also, is your alternator grounded? Theres a black wire that comes out of the harness that attaches to a screw hole in the back of the alternator. My alternator went bad recently and unfortunately it took my Braille with it. One thing I noticed was that when I would brake (at night) my gauge cluster would dim, and would get brighter when i rev'd the engine.

I bought a new battery and alternator and shes been good to me ever since :)