Motor Wiring I have an inoperable Jazzy chair that needs new batteries and who knows what else. I would like to keep the drive wheels and motors. Each motor has 4 wires, 2 white, 1 red, 1 black. I assume the 2 white are for forward or reverse. How do I wire these to run full forward with no speed control?

It's possible that the clicking noise is being caused by a loose or worn-out component within the left drive wheel of the Jazzy 300 power wheelchair. The tightness of the wheel could also be contributing to the problem.
To diagnose the issue, you may need to inspect the left drive wheel and its components, including the motor, axle, bearings, and any other parts that may be causing the clicking noise. Tightening any loose components or replacing any worn-out parts may help to alleviate the issue.
It's always a good idea to consult with a professional technician or the manufacturer of the Jazzy 300 power wheelchair for specific troubleshooting advice and repair recommendations.

On the back of the chair, there is a lever that dis-engages the drive motor to allow you to push the chair.

Likely 2, 3, 4 or 5 bar flash code. If motors are made by a company like "ELE...." then motor wiring is likely bad inside wire insulation where wires go into motor cap. Rebuild motors and try again. This is a common problem with these motors.

3 flashes indicate that there is a short circuit to the left motor and battery connection. Check wiring and connections

Your version has a Dynamic Controls model controller and joystick.
Unplug the charger and engage the motor/brake lever so the chair is no longer in free-wheel mode (con't push by hand)
Turn the chair off, wait 5 seconds, turn the chair back.
If chair still does not run and your wrench is flashing you have a problem. Count the wrench flashes - the flash count indicates the error detected. 3, 4, 5, and 6 flashes indicate and error with the motors.
3=Left motor fault
4=Right motor fault
5=Left brake fault (may not be engaged)
6=Right brake fault (may not be engaged)
Any other fault code usually means the electronics or wiring is bad and not worth fixing.

Check your freewheel levers. They must be engaged or the lights will flash and the chair will be inoperable. These levers are under the shroud behind drive wheels. (One on each side)

Since each drive wheel has it's own motorand both are controlled by the joystick you can narrow it down to the motor opposite the side it is pulling to (probably not the joystick programming if it was working before). However, there may be another answer: if your home has a lot of carpet, or worse a dog, check where the wheel mounts to the drive motor and clear anything that might be wrapped around the wheel axle into the motor, similar to what happens to a vacuum cleaner brush wheel.

Here's a link to the Pride Tech Manual guides. Click on the 1103 for a PDF file.
http://www.prideservice.com/TechnicalProductGuides/technicalproductguides.asp

The wiring is pretty simple and straightforward. These operate on a 24VDC system provided by two 12VDC batteries. Power from the batteries goes to the controller into a Joystick/controller combo. It leaves the joystick down to each motor/gear/brake assembly. Power to the batteries comes from the charger which puts out 28VDC, with a 120VAC input. Very rarely does any of the wiring go bad excepting those people who grossly overload the chair, or run it into fixed objects at full speed. Other mishaps with overamping are caused when somebody tries driving over unstable surfaces like sand, gravel, mud/wet grass and spin the motors. This drives the controller crazy because its job is to keep the chair pointed in the right direction, and with wheels spinning, it doesn't know what to do. Overheating the motors or controller, or both. There are two sets of "brushes" on each motor that carry the current from the batteries to the motor. These are located under a black-plastic slotted screw port at the ends of each motor. Removing the plastic screw reveals the brush. It should have a flexible semi-copper lead that shows no evidence of overheating, or brittleness, and should be about 3/4 of an inch long. If 1/4 of an inch, it should be replaced. Check all four. Good luck.

one battery was low,,,,not sure if anyting else is bad, used chair...by having only one battery low, it ran down the chair...

When you say inoperable I am assuming you are not getting a flash code on the joystick. I would check the wiring from the charge meter on the rear? console - you will see a yellow slug in the harness that has a fuse in it - check all the wiring from the meter as this can cause a 'power loss' problem. Of course, check the battery connections as well.