[smileynialley]

Basically, I've noticed the headlights dim whenever I press the brake pedal.
This kept happening and tonight I noticed the lights would dim when I used the windows.
Then, when I pressed the "all four windows up" button, the lights would pretty much turn off and all my electrics inside the Hummer cut out momentarily. The engine stayed on and all was fine when I turned it off and on again.
The only thing different I've noticed is a high pitched whirring / wining noise coming from the dash board area, which seems to speed up and slow down with the revs.(not sure if these are linked)

Any ideas guys? i'm stumped!
Thought it could be the alternator but the gremlins don't match that problem.