What light's ? headlamps , inside lights ? If headlamps , lighting control module could be the problem ,or switch !
If your talking about auto headlamps, pull the two fuses in diagrams, it may stop your headlamps from draining the battery, till you can diagnose the problem. You have a lighting control module that controls the headlamps, that module may have a problem? It's hard for me to be sure, from where I'm sitting.
Can you check for applicable trouble codes, to see if a code points to lighting control module. Some of the national brand auto stores will check codes for free, if there are any.
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