84 turn signal issues

So in the course of checking things out, my current focus are the bulbs. Looking at the bulbs they appear that they've all been in there for a while. When trying to remove one, when pressed down the bulb turned but not the base.

Anyway, When the right signal is selected everything works fine, but when the left side is selected everything pulses. (headlight, brake light etc) What should I check out? :help:

My quick plan is to replace all the bulbs, sand down the sockets, put some dielectric grease on and go from there.

Check left side ground wire and look for any chafing of the left light power wires.

+1 on bad earth.

Like in the control switch?

most likely in the fairing wire harness. Might just be a dirty connector.

Could also be on the bulb holder itself.