Rascal turnabout key picture has flashing red light ...scooter wont move

http://www.ezmobilitybattery.com/media/pdf/Autogo%20Ultralight%20550%20Manual.pdf

https://marcsmobility.com/electric-mobility-rascal-auto-go-550-red-power-chair-used-electric-scooter-10082015.html

can you send me a pic of the setup? Black an white go to wire that connect to your outlet, the green goes to the ground.

Could have a wiring issue you should look in the console make sure nothing is crossed.

Is it in freewheel mode?

This device either is hydraulically operated or operates use a motor and jacking screw, which is much more common. Take the seat off the jacking post. Put a piece of wood on the top where the seat was mounted. It should make the same kind of motor noise going down as it makes going up. If it never made noise going down it probably because its a hydraulic system so the down button activates a valve opening a hydraulic line allowing fluid to flow out of the chamber holding the piston up that your chair is mounted on. If it did make the same kind of noise going down, its a screw jack type mechanism. In either case hit the top of the wood once with moderate force. I like using a 5 pound hammer. I call it my master calibration tool. Make sure you strike the top of the wood piece straight down in order to avoid bending things. Try operating it now sometimes things get stuck when moved to their limit. So push the reverse button, then tap the piston down. You can check to see it the motor is getting voltage you will need a 24v circuit tester
http://www.amazon.com/OEM-25886-6-24V-Circuit-Tester/dp/B0014WIVX6

I would like to see pictures of his devise. Any tag or stickers with who made it, model number?

Neil wood, the Rascal 600 DOES use an on board charger. What signal is the white wire looking for to make the scooter move is the question. 28v?

The green light on your charger indicates a full charge but you know thats not right since you didn't charge the batteries when they were in storage they have dropped so low the charger cannot detect them and provide a charge. The batteries will need to be replaced with new ones. Charge before use and charge for at least 20 days to get them operating at 100% now you will have to use it for those 20 days to get the batteries used to charging charge every night when you go to bed and unplug when you get up in the morning. If you do have to leave the chair for a week or so put up fully charged and charge once a week overnight. If you put the chair in storage again disconnect the batteries from the chair and store with a full charge. Hope this helps you

The Rascal Turnabout model 312 power chair has VR2 electronics made by Penny and Giles Drive Technology. The VR2 electronics will give you a flash code to indicate the problem with the power chair.
Based on what you are describing, you have a right motor fault.
This means there is a problem in the motor, the wiring, or the connections to the motor.

Let's take each of these in turn.
To make the checks on the various components, you need to remove the seating system.
Unplug the joystick cable leading to the base.
Remove the seating system from the base using the release lever and 1 or 2 people to lift it off the seat post and onto the ground.
Remove the cover from the base.
Check all the electrical connections in the base and make sure they are tight and pushed together making good contact.
Your power problem may be related to the batteries so you can check them while you are in the base. If your 2, U-1 batteries are more than 1 year old and test bad or weak replace them with new batteries. You can have them tested where you buy new ones or find someone with a load tester and you can test them yourself.
If all the electrical connections are tight, or if one of the connections was loose and the contact had backed out of the connector, fix it and you are home free. Test by scooting the seating system over on the floor and plugging in the joystick to test.
If you still have a fault code, find the wiring leading to the right motor. ( You should also check the left motor while you're under the hood because sometimes with mid wheel drive chairs the fault code is reversed when the motors are plugged in the controller). If you have a voltmeter, you can check out the motor. Unplug the motor at the connector. These motors may have 2 different style plugs that will release when you press the plastic lever and wiggle the plug out. Check it at the controller for good contact.
The plug should have 2 large wires for the motor and 2 smaller wires for the brake. The brake should read between 40 to 60 ohms and the motor should read between 0 and 1.5 ohms. If either of these is out of factory spec, replace the motor/brake assembly. If the gearbox is noisy or leaking, replace the motor/brake/gearbox assembly.
With that being said, you need to check and replace the batteries first if they are weak or bad.
If you are handy or know a good mechanic the assembly can be changed in 2 hours including testing and diagnosis,removal and replacement of the assembly.
You need to call Electric Mobility to get the replacement parts 1-800-MOBILITY. Hope this helps.