Jet 3 ultra 3 Flashes The left motor has a short to a battery connection

Question edited for clarity.

You have a dead short somewhere. You need some electrical knowledge and a digital multimeter for testing. Take all the covers off. Look for wiring that has rubbed through and touching or melted. Disconnect one of the motors and replace the fuse. If it still blows, reconnect that one and disconnect the other motor. If one motor doesn't blow and the other does, you know you have a faulty motor. If neither stop the issue, then you move up to the controller and look up there. With a meter you can check for shorts within the motors, as well as grounds.

Or just take it to a Service Centre and have it repaired and serviced properly.

Basic troubleshooting

INFINFB2045 Jet 3 Ultra Troubleshooting

Pride Mobility https://www.pridemobility.com > pdf > infinfb2... PDF troubleshooting instructions for the Jet 3 Ultra Power Chair. This information is to be ... A blown charger fuse can cause the charger inhibit to activate.

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  JET 3 ULTRA

  https://www.pridemobility.com > pdf > us_jazzy
  PDF
  Jet 3 Ultra www.pridemobility.com. 3 ... If the circuit trips, allow your power chair to "rest" for approximately one minute. ... thermal fuse on each lead.

INFINFB2045 Jet 3 Ultra Troubleshooting
https://www.pridemobility.com/.../troubleshooting/infinfb2045_jet_3_ultra_ troubleshooting.pdf
File Format: PDF/Adobe Acrobat
troubleshooting instructions for the Jet 3 Ultra Power Chair. ... What if the systems on my Jet 3 Ultra seem to be "dead" (controller does not light up when the on/off key is ... you continually allow the battery condition meter LEDs to fall into the red area, the ... 1 Flash. The batteries need charging. Check the battery connections.

According to manual. (https://www.hoveround.com/Hoveround/media/Document-Library/D82008753R-MPV5-Owners-Manual.pdf)
4 flashes: The right hand motor has a bad connection.

Other codes...
New VSI Controller 1 flash: The battery needs charging or there is a bad connection to the battery. Try charging the battery. 2 flashes: The left hand motor has a bad connection. 3 flashes: The left hand motor has a short circuit to a battery connection. 4 flashes: The right hand motor has a bad connection. 5 flashes: The right hand motor has a short circuit to a battery connection. 7 flashes: A joystick fault is indicted. Make sure that the joystick is in the center position before switching on the controller. 8 flashes: A controller fault is indicated. 9 flashes: Problem with the brake circuit. Check that the manual release levers are in the drive position. 10 flashes: An excessive voltage has been applied to the controller. This is usually caused by a poor battery connection. Speed Bar Cycling: Controller locked. Speed Gauge Cycling: Check if battery charger is still connected to controller or controller fault.

The lights flash in a systematic sequence which reveals an VSI error code. Count the number of flashes.

1. Battery needs charging
2. Left motor bad connection
3. Left motor shorted
4. Right motor bad connection
5. Right motor shorted
6. Unplug battery charger
7. Joystick fault. Make certain the joystick is in the neutral position (centered) before turning on the controller
8. Controller fault. Check connections
9. Parking brakes bad connection. Check connections to parking brake, motor and controller
10. Excessive voltage. Check battery charger connections.

hi,

3 The left motor has a short circuit to another connection. Contact your authorized Pride Provider.

Regards
Rob..

1 Flash The batteries need charging. Check the battery connections. If the battery There is a bad connection to the batteries. connections are good, then try charging the batteries. 2 Flashes There is a bad connection on the left motor. Check the left motor connections and wiring harnesses. 3 Flashes The left motor has a short to a battery Contact your authorized Pride Provider. connection. 4 Flashes There is a bad connection on the right Check the right motor connections and wiring motor. harnesses. 5 Flashes The right motor has a short to a battery Contact your authorized Pride Provider. connection. Rippling LEDs The charge inhibit has been activated. Make sure that the battery charger is not connected to the power base. 7 Flashes There is a joystick fault. Make sure the joystick is in the center position and then power off and on again. 8 Flashes There is a control system fault. Check power module and joystick module connections and wiring. 9 Flashes The park brakes have a bad connection. Check the left and right motor connections and wiring. Check to make sure that the power chair is not in freewheel mode. 10 Flashes An excessive voltage has been applied to Check the battery connections. the control system.

or go here and find yours,if you would of given the info we need,i would of diagnosed it for you,but,you didnt Pride Mobility Products Corp Basic Troubleshooting Instructions

batrans your motor connections are reversed. remove the seat and shroud over the batteries find the motor connectors that come from the joystick cable and switch them. This should fix your problem Hope you geterdone

hold joystick back, press on button, move joystick forward, then let go.

Assuming it is a P&G controller (it'll say PG Drives technology on the bottom of the joystick), two flashing lights is a left motor disconnect fault. Check the wiring from and to the left motor for tight connections at all junctions. Unplug and replug them, don't just wiggle test them. This should clear the fault.