1975 k5 turn signals dont work?

[1low75]

Hey guys lil new to this thread.i recently got a hold of an orignal 75 2wd blazer. I ran into a problem break lamps headlights highs and side markers work..reverse not coming on and signals dont work they seem to be lit up but dont flash i checked for power under the column seems to gettin power from the turning switch harness also changed new turn signal flasher relays any clues?

 

[Mr Clean]

from N.E.

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