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My Husquvarna LT4140G ride on mower does not start but battery is fully charged. Is there an isolating switch?

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I am assuming that the engine does not turn over...

Sequence is....
Make sure that it is in neutral.
You are sat on the seat.
The brake pedal is fully depressed.

If it still won't start...
It could be the ignition switch
Seat isolation switch
Brake isolation switch
Gear selector isolation switch
(The isolation switches are linked)

If the engine turns over or at least tries then it is either battery, ignition or fuel.

Posted on Apr 17, 2017

Testimonial: "Thanks for tips, the engine does not turn over at all. I have shorted across solenoid & can get engine to turn over. I will look at ignition switch & other isolation switches first."

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Do a couple of good bounces on the seat, check the clutch brake pedal switch for clicks and then look at the PTO clutch. More ofthen than not the wires around the PTO clutch get damaged by the belt and short to the chassis. If this does not help you identify the problem... you will have to use a meter with the key on and the POSITIVE terminal disconnected from the battery (isolated) seatching for chassis grounds. You will need a new fuse installed while troubleshooting. When a ground is found with the key ON.... check to see if you have that same ground on the alternator terminal of the key switch. Usually terminal A or A1.

Check out this diagram.. it is typical of all riding mowers... http://c.searspartsdirect.com/lis_png/PLDM/1006648P-00012.png

Mostly the top part of the schematic for safety switches and the starter Jumper white to white on the PTO clutch wires and see if it will turn over. Result = No check to make sure the clutch / brake pedal switch is being made when you depress the brake. Next install the Seat switch jumpers black to black and gray to gray for TESTING only and attempt a start. Last... use a longer jumper and connect White wire of PTO to the solenoid small ( + ) terminal and try a start. If it starts here the clutch / brake switch is bad. You can do this.. it is not hard. Just a matter of sorting out which switch is not working. Something to try before installing jumpers... Bounce on the seat pretty hard several times and cycle the clutch / brake pedal through full stroke. I.e fully depressed and then pull it all the way to the top for 5 or 6 cycles. Then attempt start. Kelly

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1 Answer

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Check for corroded terminals between the battery and starter, including at the start switch, Disconnect the battery and follow the wires, making sure that each terminal and connector is shiny and bright, Clean terminals with a fine sandpaper or emery board. Re-connect the battery and try. Please re-post if this problem persists.

Best regards,

--W/D--

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A fully charged battery should read a minimum of 12.65, if it does not and connections and grounds are dirty then that's your problem. Start with a none fully charged battery.If you can bypass the solenoid and start it then the culprit is the solenoid. Good luck. donnyb60

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