85 westy. Have off & on problem with rapid blinking in front and no left
rear turn signal. If I get out and smack the rear lens it will cause normal
blinking- sometimes not. At start up the dash green light is faintly
glowing but then goes away. While holding the removed bulb housing the bulb
blinks normally and will  work fine for a while when put back. I have
replaced bulb, flasher relay and cleaned the ground terminals attached on
left side of engine compartment. Any suggestions where to go from here?