Turn signal problems

[jsulli20]

Recently bought a 00 ccsb, my turn signals are blinking really fast like i have a light out but all lights are good. When i have trailer lights hooked up everything works perfectly normal. Any ideas?

 

[95C1500]

check the grounds for the lights

 

[94Sierra4x4]

check the grounds for the lights

Yeah, check out the trailer harness wiring grounds.. Mine was off, fast blink was one of the many symptoms

 

[tailpipe51]

what happend with my truck was my bulbs were packed with grease in the sockets