I think my battery is getting weak - I started it last night and the battery, brake and A/T temp light came on and never went off. The headlights seemed dimmer to me as well. Any one see this before?

 

It might be an indicator that alternator is not running at 100%. You need to check both battery and alternator. You may have a bad alternator that is not putting out charge, or a bad (shorted out) battery that is "draining" the charge it's getting faster than alternator can put it out.