If you grounded the yellow wire at the control switch or anywhere before it goes thru the limit switch there is a possibility the limit switch is the item at fault.
If you need a solenoid here are Cole-Hersee replacement numbers. They are available from ebay vendors and maybe Napa. You will need to verify the orientation of your solenoid on the mounting bracket to get the part number with the proper battery terminal layout.
I don't remember where this 55 diagram showing the 56 switch installed came from to give credit but it is one of the better drawings.
Attach file:
Cole Hersee Pair TL solenoids.jpg (124.95 KB) 56 unit on 55 car.jpg (130.48 KB)
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