Re: Turn signal flasher
 

Check your ground on the dash cluster. Any problem that you encounter with a light always check the ground first. Saves a lot of wondering.

Re: Turn signal flasher
 

I've learned a lot about electrics from you guys. My first step was to check the ground :D

Yesterday in the evening I solved the problem. I cleaned the contact surfaces of the circuit board and the bulb sockets with contact spray. Three bulbs were burned. Now it works.