96 Sierra right turn signal not working

Stuartwoodhead

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Got the usual fast clicking noise one day that usually means a bulb has blown. Bulb looks fine but swapped for new ones anyway. Still no right turn signal. Arrow on dash lights up and just blinks fast. Relays are all clicking and making the right noises. Now it gets strange...I plugged my trailer in and everything works fine (so it's not the bulbs). Unhook the trailer and back to faulty signal again. Any ideas where to start?
 
my quess is a ground problem when you plug in the trailer that probably connects a better ground
 


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