My '97 Ranger just developed a problem. If I'm going down the road and want to turn left, my front turn signal works fine. As soon as I step on the brake my turn signal light stays on (constant) as long as I have the brake applied, the signal light and noise stops inside the cab except for a dim constant indication from the left arrow. When I release the brake, it goes back to flashing as it should When I'm stopped with no turn signal switched on, applying the brake lights up my front signal - a front brake light is a good way to describe it.
I probably have a grounding problem somewhere - but sure could use some hints on how to go about searching.