I have a Jazzy 1113 powerchair and the on board charger has gone bad. I want to know if the off board charger from my Merit P301 will work thru the port in the joystick controler on the Jazzy to charge the batteries.

The MK batteries are far superior to Interstate batteries overall.
You can load test the batteries to see if they are working properly with a load tester. Your can test the charger output to the batteries with a digital voltmeter connected to the batteries with the charger plugged in. These 2 tests take less than 10 minutes and can be done at a local auto or scooter shop for nominal expense.
Make sure the charger and battery connections are tight and free of corrosion. On the VSI of the Jazzy 1113 there is a notorious problem with 8 pin connector and 3 pin molex at the back. You can clean these connectors but a complete electrical rebuild of the pins and receptacles is sometimes required if significant corrosion has set in. Try spraying electrical cleaner and use green Scotchbrite to clean the metal tabs on the 8 pin connector. Make sure the 3 pin molex sits in the receptacle and is making good contact.
Hope this helps.

The voltmeter should read 29 volts when on. You should never replace one battery and leave an old battery in the chair. Replace them both at the same time.

how long in storage? if the voltage is below a certain threshold the charger wont come on for safety reasons. try removing and charging each batt separately careful to note the EXACT!!!!!!! positions and configuration when putting them back then try charger if not then batts are prob bad

With the battery charger That was easy wasn't it? No, take the off board charger plug it into the charger port located under the front of the joystick and then plug it into the wall outlet and let er rip overnight The yellow light on the charger should turn green indicating a full charge disconnect from the wall and then unplug from the joystick and you should be all set Hope this helps

The flash of the speed lights indicate that you are in the charger inhibit mode and if the charger is not plugged in then you have a problem that needs to be checked by a tech or your provider that sold you your chair Sorry I don't have a quick fix

Mike since you know that the charger is not working you have two options purchase a new on-board charger or try to locate a good off-board charger from the area. A friend that has an extra charger or from a local provider that sells chairs. The off-board charger will plug into the charger port under the front of the joystick and will charge the batteries just as well. Just don't use the on-board charger but leave it in the chair. Hope this helps

If you have checked the charger and are sure it isn't working. Then you have two options: You can buy a new on-board charger or try to locate a good used off-board charger from someone in your local area. Or maybe borrow one from a neighbor that has a power chair to see if it will charge your batteries. You just plug the off-board charger into the charger port located under the front of your joystick. Off-board chargers should be cheaper than an on-board from Pride. Hope this helps

Most likely the batteries have gone solid while it was sitting unused. The gel in the batteries requires them to be put on a charger at least once a week even if the rider is not using the chair otherwise the batteries will go bad. Replace the batteries and that will most likely solve your problem. If his insurance bought the power chair for him, they may cover the cost of the replacement batteries. The batteries cost $75-$120 otherwise, and you will need two of them.
Good luck!

Charger is charging should turn solid green when fully charged if not the batteries are bad or charger is not working correctly

Naw the batteries are shot Get yourself two U1 batteries from a battery warehouse or store that sells batteries around $200.00 for two