The CHMSL has its own fuse and relay in the under hood relay center or your brake switch is bad. Check all of those things. The bulbs also do not last that long, as they often melt the lens over them if you sit in traffic a lot.
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Exploration Machine- 02' CC V8 swap. 300K+
Portable Roller Coaster- 07' MKV VW GTI
Its another Jeep- 98 TJ