[BoomOP944]

Hey guys, my 86 944 N/A is really slow to start lately. When the car is running and I pop the head lights up, you can see the battery needle dip down....same thing when I go from high to low beam. I turned the car off and realized I left the window down. I popped the key in and hit the switch and watched the battery voltage deplete in front of my eyes.
I can drive for about 20 minutes or so cut the car off and 10 minutes later again, turn the key and my voltage is barely above the red and it takes awhile to start.

Is my alternator not charging, or is my battery just shot and needs replacing?

Thanks guys,
Bob