Turn signal grounds...

Have an intermittent problem with the front right turn signal. Sometimes it works fine, other times the right turn signal will only come on solid when activated (doesn't blink) with the head lights off. If you turn the head lights on, the signal lights come on at all times (doesn't matter what position the turn signal switch is in) but the front right signal is completely off. The rear signal light and dash light is on solid. Left turn signal operates fine in either situation.

I'm thinking its a ground issue, but I'm not sure where the ground is located. Its a 72 Dodge Demon.