Disclaimer: I've Googled and searched for this to no avail

About two months ago, my alternator went bad and apparently my ignition coil was cracked for a while too, so my battery went dead. All three at the same time. Now though, being extra cautious with watching my gauges, I've noticed odd voltage drops and activity, if you will. Basically, whenever my turn signal is on, the volt gauge will dance back and forth (drop when it's on and come back for that second). I've been told that this is 'normal' but I'm not sold. ALSO: when I'm driving and I have the headlights on (sometime high beams), the radio on (after market Pioneer screen), the rear defroster, and the heater on full, the voltage will drop to below the halfway point on the gauge at idle. Obviously this is a lot of power, but why is it dropping so low? The headlights and dash back lights DO dim! This is startling and disconcerting. There is a new battery, new alternator (factory), and new ignition coil installed. PLEASE HELP

 

My turn signal causes the voltage needle to wiggle, and at idle mine runs at about 13.9v on the guage at operating temp. It's higher when cold. Mine do seem a little dim, and I have noticed them flickering a little if you concentrate on them. I haven't figured that out yet. It sounds like yours is normal though.