Bought a new battery for our grandson's John Deere ride on mower. The connectors came off the battery so we took it back to Battery Plus. They resoldered the connectors and the battery seems to work, the only problem is that after we hooked it up it goes backward when you press the gas pedal and forward when you put it in reverse. We took the battery back to the store and they say the soldered it correctly. What gives?.

Dirty or bad connection on the battery.
Bad ground.
Battery not enough CCA.
Faulty cell.

You'll need a battery, from the battery you'll need to run wire to the starter(if it's electric start), and the coil/distributor.

John Deere Riding Mowers
Richard, Check the attached links,instruction and guides for wiring diagram. Good luck
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Wiring diagram for john Deere model 125 Google Search

John Deere Lawn Mower Battery Keeps Dying

HOW TO TEST REPLACE SOLENOID ON LA125 JOHN DEERE MOWER

john Deere model 125 Schematic Google Search

The voltage at the electric needs to be checked. You have a bad switch or electrical connection.

Another way to check the pto is to apply 12V battery voltage directly to the clutch's electrical connector via jumper wires. If engages fully doing then you an electrical problem before the clutch.

Check "under the hood" to make sure all connections are tightly connected. I bought the girl version of this and one of the cords had come undone. If that doesn't work go to your local batteries plus and see if they can test out your battery to be sure its a working battery.

check that charger is putting out 12 volts at least

hi,
one of the safety switches probably came out of alignment, probably the safety switch at the pto blade control. its an electric switch up under the frame usually. there are a few of these switches on riding mowers and just one of them will stop it. check your seat switch to make sure its functioning. a word of advice. these switches are backwards of what you would think they would be, meaning when the switch contacts are apart, it will start and when they are closed or together it wont. if switch seems to be working unplug the electrical connector off the ignition switch from the rear and see if its rusty, plug it back in. check your battery connections for rust, check all your contacts for rust and sand them down.
jm .

first off, check the battery and the charger with a multimeter and make sure that they are putting out at least 12 volts

use a multimeter and then verify that there is at least 12 volts of current from the bttery and the charger

I upgraded my Peg Perego shifter and it came with the wiring harness.
I bought it at http://www.shopjandl.com/
Hope this helps.