Dim lights?

so im having a couple problems with my lights. im wondering if anyone else has it too... im finding my head lights seem really din at night especially in the rain. and my right reverse light is dim as well. so if anyone knows anything can ya help me out?? thanks!

Have your battery checked. Assess the condition of your belt around the alternator. Assess wire from alternator to ground and to battery. Check to see if any light bulbs are burned out.

And clean the grounds under the battery tray.