I have a 8ft Fisher storm guard plow on my dodge 2500, the plow moves very easy left to right if you push on it can not move up and down, all functions work from controller goes up down left and right no issue just wondering if its rams or hydraulic that are bad

Hydraulic fluid doesn't really freeze. When it does, we wouldn't be around to see it. You need to go threw electrical. Go to there web site and see if you can get a diagram for it. Old systems are fairly easy to go threw. Newer ones have PC boards. Older ones, the stick/switches go bad first. But it always wise to loosen, then tighten the nuts that hold wires first. Corrosion sets in because it isn't used for so long.

Start by plugging everything in and pop the cover off the control part on the plow and check for magnetism on all 3 solenoids when you hit the various buttons on your plow controller. The pull should be very strong and noticable...a weak magnetic pull is likely just residual magnetism on your screwdriver. In my case, the S3 solenoid wasn't firing and that causes exactly what you're describing.

If your S3 isn't firing you can test the wiring by moving the S3 hot wire to the S2 solenoid. If your wiring is good the plow will misbehave in an entirely different way. Also get out your ohm meter and test the S3, if its good you should get 7 ohms on it.

You need to use the guide from Fisher and be methodical about it. Start at the plow and work your way backwrds towards the truck.

Most of those systems don't have a driven retraction on the piston. It is gravity feed back. There is a valve that is sticking or out of adjustment. http://library.fisherplows.com/?cat=38

mine did the same thing bump the blade to push the cylinder back in .if low on fluid use only Meyers fluid only

does the pressure release close to raise the plow?

Sounds like pump is not working, check all fuild lines. Unless the plow is all electric, then the ground

Sounds like you have an electrical problem with motor running all the time.1st thing i would check is the switch.make sure it is wired right and the switch itself is ok. as far as it moving on its own. could possibly
be a solonoid gunked up.or low on fluid

un bolt the motor from the base, the pickup is just tin, they rot off and fall into the base. you may have valves stuck too, but if nothings moving and pumps running, it should labor BADLY