The problem on my 5225 was a burned-out fuse. In the fuse box inside the panel behind the left floorboard, look for a 10-amp fuse F18, location 26 (may be different on your 5525). On the 5225, it controls the circuit for the power reverser and dashboard gauges, warning lights, etc. To make sure the fuse is good, check for resistance using an ohmmeter. My fuse looked good at first glance, but it was broken. If the fuse is OK, then check the relays behind the dashboard, making sure that they 'click' when you plug them back in while the ignition is on. But don't start the engine before you check them, otherwise you won't hear the soft click. Swap the relays to determine if the problem is the relay or elsewhere in the circuit. If the relays are good, then check for a bad ground. Your dealer may be able to give you a wiring diagram whcih will show the ground wire.
That procedure is how I traced the problem back to the blown fuse - which I should have found in the first place.