I would do what John T has suggested. I would first suspect a short between hot and safety ground in one of the fixtures or even in the switch box.
I would further suspect that your safety ground connection/breaker panel may not have a good ground connection to neutral in the system where it is supposed to be connected. If it does not and you have a ground rod connected to the breaker panel you could have extra current flowing thru the earth via the hot to safety ground short.
If the safety ground is properly bonded to neutral the breaker would trip if this was the problem.
I am assuming that the breaker serving this circuit is in a sub panel in the shop? How/where does this panel get its power?
If this is a sub panel it should be fed with 4 wires from the main panel where neutral and safety ground should be bonded.
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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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