electrical woes?

[BUXMAN66]

what would cause the drivers side headlight to become dim? i've been tinkering 'round w/ the electrical system lately,(new 1 wire alt.,new battery cables,grounding straps to body and frame)replacing different things.had been experiencing a loss of battery voltage but come to find out i had no grounding straps to speak of ,so replacing them seemed to take care of the inability of the alt.not producing any voltage to keep my battery charged.but......even after replacing these parts i've noticed a slow voltage drain on my battery.at engine idle the alt. is making 14.5 volts back to the battery,battery is showing 14.5 on positive battery post at engine idle. with engine shut off,12.5 volts at battery positive post.after sitting w/ engine off for approx.1-2hrs.volts are showing 11.9-12 volts actually not enough to turn over engine. no lights are on,stereo's,interior light......zilch.now what in the he!! could be draining the battery?no circuit's have been left on! what really got me was the drivers side headlight going dim which i had never noticed b-4,could this be connected,somehow?(i did jiggle the plug into the headlight,made no difference.)sorry for the long post,guys!