Disconnect all the G.P.'s and connect an ammeter capable of reading 20 Amps to the (+) battery post and momentarily touch the other lead to the terminal on each G.P..
If a given G.P. is OK it will draw in the 12 to 20 Amps range, all should test about the same.
If "open", (of course) there will be no current draw.
TYPICALLY they will test pretty close to each other (if made by the same manufacturer), most either work properly or not at all.
Alternately, if no ammeter is available simply connect a wire to the battery (+) and brush the end past the terminal on each G.P. and note that there's a similar small spark at all the ones that are good/drawing current.
No matter how you test them do not apply power for more than a few seconds, once the overheat they can blow open making removal difficult, or even break off and fall in the cylinder.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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