Can I rule out a bad turn signal switch? ('79 C10)

[Red Dog]

Howdy folks,

I've been battling a left signal issue for about 2 weeks now.  I've looked at schematics,The bulbs, the grounds, etc.  When I throw my left signal, the REAR works perfect.  The front however does not.  It will work with 4ways no problem.  I've been told this is a ground issue but cannot find any bad grounds.  The signal and side market are not working.

Today I'm going to replace the socket assembly of the turn signal;  as a last ditch effort before tearing into the steering column.

On a side note, when I originally purchased the truck.  The Left REAR did not work either.  This was caused by one of those Walmart LEDS, I switched back to a regular bulb and the REAR signal works fine.  My front bulbs are good however.  s.o.s

Thanks

[zieg85]

I've had switches go bad exactly as you describe.  I've switched steering columns before to find out the column I just put in, the switch was bad...