[terry251]

Mark, that light is your alternator warming light. Either the alternator isn't charging, or you may have an electrical connection issue somewhere between the alternator, the alternator gauge or the battery. Do you have one of those screw in, screw out battery disconnects on the positive or negative post? That might be loose.

edit: Also, my gauge also pegs at -50 when the fans come on, but goes back to a positive charge quickly.

Terry