There is probably a seperate fuse for brake lights and turn signals.Its been a long time since I worked on a Chevy but I think there might be a seperate flasher for the 4 ways and turn signals.So the flasher thats in the fuse box might be for the 4 ways and there could still be another one somewhere for the turn signals.Also since you say if you hit a bump right it works a while almost for sure means its a plug in or connection somewhere.If the cab is real rusty it might not be grounded good on the turn signal circuit and once in a while it gets ground when you hit a bump. That could be a Ford that has the seperate flasher outside of the wiring harness I just dont remember,but I have worked on several of those old Chevys years ago.Look for a wiring diagram somewhere and it will show if it has 2 flashers.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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