Best advice we can give you at the moment is to download the service manual and print it off and take it with you. Take a volt meter with you if you have one. Check ALL the connections....might loosen them and re-tighten. That may be all it is....could be something else. A lot of times if they were running, your gone and come back and it dont run its just a connection. Wiggle the F/R back and forth while pressing on the pedal. If it jumps the contacts are oxidized over or bad....sometimes they'll start working. Check the total pack voltage. Those are just simple things.
Heres the service manual. Right click, save as.
http://products.jacobsen.com/img/manuals/28646.pdf
Yea....solenoid is supposed to click....but again, just because it clicks doesn't mean its good. If the solenoid has gotten really LOuD and this started I would inspect it. The bolts holding that cover on may be a bear to get out....mine usually break, not all but most.