My '54 Ford is still using 6 volts.   I had a lot of difficulty getting the overdrive working when I first put this car together, but I finally got it to work.    It worked for awhile but then stopped working again.   When bench testing the solenoid, is the plunger supposed to be extended when there is no power to it and retract when powered?  Mine works just the opposite as the plunger extends when I apply power to the blue wire and ground the case and then retracts when not powered.  I saw online that someone was saying that the plunger retracts when powered but mine does the opposite.  Anyway, the solenoid  plunger moves when bench tested but when I install it and tighten the mounting flange nothing happens when I put power to it.  However, if I loosen the two flange bolts to hand tight only, the solenoid clicks when power is applied!  I know this sounds weird but that is what it is doing.  Can anyone help me figure out the problem?  Thanks