Where is the left motor connection on hoveround model mpv5?

SOURCE: Where can I get a manual for a Hoveround MPV5

This manual is a hard one to get. You will have to call Hoveround. If you would like, Click the link below and it will take you to Hoveround's web site.
http://www.hoveround.com/wp/products/power-chairs/mp5-power-wheel-chair/

SOURCE: How do I lock up my Hoveround MPV5?

1. Turn the controller on.

2. To lock the chair, depress and hold the ON/OFF button. After one second the controller will beep. Release the ON/OFF button. Move the joystick forward until the control beeps. Move the joystick in reverse until the control beeps. Release the joystick. There will be a long beep that indicates the controller is locked.

3. To unlock, turn the control system on. The speed/response indicator will be rippling up and down. Move the joystick forward until the control beeps. Then move the joystick in reverse until the control beeps. Release the joystick. There will be a long beep that indicates the controller is unlocked.

This is from the manual, I hope it helps you.

SOURCE: How can I get a manual for the Hoverround MPV5?

If the power chair was stored for a while, the batteries may have gone bad. There is a gel inside them that needs to be put on a current regularly or it will solidify. When you connect the charger, you get a green light because it senses the batteries are full; unfortunately they are full of crud, not power. Try replacing the batteries to see if that solves the issue. You can probably take them to an auto parts store or Interstate Batteries to have them volt tested. The type of battery you need is a U1, 12volt, 33amp and you will need 2 of them.
Good luck!

SOURCE: Online owners manual for Hoveround MPV5

The full manual is not available online. It must be purchased directly from Hoveround for $20 plus shipping. Please call 800-964-6837, you will need the serial number from your power chair, located inside the manual brake release above the footrest.
Good luck!

SOURCE: My Hoveround mpv5 will not turn on charger states

It sounds like the batteries have gone bad and need to be replaced.

The batteries contain a gel that needs to have current run through it on a regular basis (at least 8 hours once a week) or it will solidify. If you attach the charger, what will most likely happen is the green light will either stay green or go to green after a very short time. When you turn on the power chair, nothing happens. The charger will indicate the batteries are full, but instead of being full of pwer, they are full of crud. Your warranty will most likely not cover replacment as this is due to customer neglect, but your insurance may still cover the replacement if you can wait for the process to go through. Otherwise, you will need to replace the batteries on your own, type U1, 24v 33 amp, found at Batteries Plus, Insterstate Battery or any other battery warehouse for $75-120 each.
To replace the batteries:
Remove the black power cords behind the battery covers by squeezing the plastic pinch clip. Remove the cover carefully by unhooking the black webbing strap so that you do not yank any of the leads. Using a 7/16" wrench loosen the bolts that attach the leads to the posts, be careful if there is any corrosion that may irritate your skin. Check the fuses to make sure they are still good; if not they are regular automotive fuses that are inexpensive and can be found at any auto parts store. Remove the plastic caps or any packaging from the new battery posts and seat the batteries on the tray, connect the leads to the posts as indicated and tighten with the wrench. Place the batteries back ont he tray, reconnect the power cord, Replace the covers, and tighten the straps.
You may want to use the power chair until the battery is used up before you charge it fully for 8-12 hours; this will ensure that the battery gets FULLY cycled and any buildup inside the battery from it sitting on the shelf in the store is burned out. Make sure that you charge the power chair after a full day's use for 8-12 hours (overnight), not after every trip as overcharging can cause damage. If the power chair in not going to be used for a while, continue to charge the batteries at least one day a week to keep the batteries fluid.
Return your used batteries to the battery store or auto parts store for proper disposal. Good luck!