Quote:
Originally Posted by jbsmithtx
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I suspect our problem may be electrical thought, because we recently rearranged wires to look "better", and thought we put them back into their correct voltages, but will check.
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Famous last words "we just cleaned up some wires"

In 2011 we had things working relatively well and then proceeded to clean up our bot. Nothing worked right after that!
Specific to your problem I would first check the voltage and the polarity of the connection to the solenoid. Put a voltmeter on the connection and check that the correct firing voltage gets to the valve. Firstly however, I would hotwire the valve from a battery/voltage source and make sure it fires. This will give you a baseline to work from electrically.
I hope this helps.
Enjoy!