Advice needed: brake and signal lights stop working when bike has run for a while

2008 EXC-R 530 over here.  Is this a known issue?  Pretty consistent.  Turn ignition on brake and signal lights work.  Start bike, still work for some time but eventually stop working.  Usually within 5mins or so. Where to start with fault isolation?


Checked grounds?  Start there...


When it happens, start poking around and see where you lose power.  I bet you'll find something loose.

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