As stated, pull the switches and look at the contacts. Also pull the lights and look at the crimp connectors. Sometimes, then need to be cut back, re-stripped and re-crimped. Finally, check your fuses.
If their blade fuses, sometimes they need to be replaced. I had to replace the fuse blocks and the fuses themselves. If it were fuses, it would be all the devices on that circuit. A temporary fix for fuses is to simply unseat and reseat them a few times to scrape the corrosion off of the contacts to make a better contact.
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