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Mower wont start. new battery new ignition

I changed ignition switch and now it seems as though the battery isnt even connected is there something i am forgetting to do

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Make sure that the machine has fire and getting gas . Check compression. this sould help you along.

Posted on May 12, 2009


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Have a 19.5 HP Twin B&S with a 46" cut model father in laws whioch hasnt started for years. He has neen cutting his yard with a push mower, but had a heart attack 2 weeks ago and has asked me to...

Hi and welcome to FixYa, I am Kelly I just answered another post and your question appeared after my posting. I see it is 2 days old. I am right now looking up the engine and the wiring diagram.
To get ignition you must have:
1. A full oil level. The engine has a low oil level sensor that will kill ignition if the oil level is low.
2. A a working clutch brake pedal switch
3. Someone sitting in the seat.
4. PTO clutch dis-engaged
5. Key in run or start.

Without all of the above you will not get ignition and the start solenoid will not cycle. (Start solenoid does not go through the oil level sensor.)

From what I can tell this is the 19.5 Hp Briggs and Stratton 42E707-2631-E1

I tried crossing the model number to a manual and the closest I could get was the manual with the same model number as yours except the last digit is a 1 vs a 3 Manual link below.


Mower parts are here:
Note the diagrams under the picture. Each of those thumbnail pictures will open a new section.

I think once you sort out the switches that you will get both the start solenoid and the ignition to work.
Since this mower has been sitting for sometime you should probably check out the PTO clutch gap. There are 3 spring loaded bolts / nuts and there are 3 slots in the PTO clutch. Static the gap in the clutch must be 0.020. Otherwise you will not only have starting problems but blade engagement problems. Adjust the 3 bolts/nuts until you get a 0.020 gap. That should make the switches in the PTO clutch work. Just look at the wiring for any damage around the PTO clutch also... A previously thrown belt can trash the clutch wiring.

After the PTO clutch your checkin Brake.clutch pedal switch and the seat pedal switch.
For troubleshooting only you can disconnect ONE wire from the oil level sensor to see if you get spark.

I recommend you get the starter to work normally first and then troubleshoot ignition. Because except for the low oil level sensor they are common.

Safety switches can for troubleshooing only be bypassed by running a jumper wire from the white wire of the key switch to the starter solenoid white wire connection. If the starter works by doing this and does NOT work without the jumper... you have safety switch problems.

Hopefully with this information you can revive this mower from hibernation.
Feel free to ask any questions anytime I will stick with you here until we figure it out.
Thanks for choosing FixYa,

Jul 16, 2011 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

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My dls 3500 mower will not start at all, I charged the battery but the engine wont even turn. All the wiring and fuses seem to be ok

I had the same problem. I replaced the wiring harness for a short fix, corrosion in the terminals that connect to ignition switch. This worked for a while. Then replaced ignition switch this also worked for short time. Now I just open the hood to reach behind the ignition switch and wiggle wires while turning key to start until it starts keep wiggling to get good contact. If it won't stop after it starts, wiggle wires after you turn the key to off. It will stop.

May 29, 2011 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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John sabre ride on mower wont start have got new ignition switch,solenoid,relay switch and new battery.Turn ignition no response

Check to ensure the PTO/Mower drive is not engaged.. and the parking brake is on..

Most mowers will not crank if these are not in the right position

Most riding lawn mowers also have a kill switch under the seat... check that for proper function as well. If this switch has failed... it would kill the power.

You can use a volt ohm meter to trace the power.. it sounds as if all the right parts have been put in place as far as the basic starting circut is concerned.. yet you have another two to three switches to check for proper function.. PTO / Brake and Seat...

Check to see if you have power to the ignition switch.. then trace back to the battery to check for power there.. if your battery has plenty of power(12.4 volts).. sounds as if it should.. you need to check each of these interupt switches between the battery and the ignition. They typically kill the power to the points/actual ignition.

There are other areas to check.. poor grounds.. and bad connections are typical. a bad ground from the battery to the frame for instance.. check cable and point of connection.

Best of luck

Mar 10, 2011 | John Deere Garden

2 Answers

John deere f525 mower, wont start, battery good, ignitor good, coil good, no positive power to ignition switch, electric on off switch for cutter looks tampered with, and a safety switch below frunt of...

The front mount mower has a safety switch on the park brake linkage and the seat belt linkage as well as on under the seat which is for the PTO,The one under the seat on the linkage just behind the battery is a culprit that needs adjusting to get the PTO to engage but it sounds like you need to deal with the seat switch circuit or replace the seat switch.

Jul 08, 2010 | John Deere Garden

1 Answer

Lt 1045 runs 20-minutes then stalls and everthing

It could very well be something simple. There are Oil level sensors that are pretty fussy. What can happen is just the slightest drop in oil level can cause the oil level switch to kill the ignition. If there is a safety relay connected in the oil level switch it can prevent starter use also.

On of the tings I would start looking for is the condition of the battery cables. (both ends) Check for a loose ground or a loose starter connection.


Seat safety switches have been known to cause the problem you describe. On newer model riding mowers there is a switch on the seat that there must be someone sitting onthe seat for there to be any power to anything on the mower.

Check the seat switch wiring and connectors. You could have a loose connection on your seat switch that is simulating no one in the seat even though there is an operator.

AThat is it for now.. give the above a shot and if the problem persists just respond here and we can continue troubleshooting.


Apr 16, 2010 | Cub Cadet Street Sign- tractor lawn riding...

1 Answer

17.5 briggs and stratton wont start checked battery, starter doesnt seem to want to crank very easy was told it might need the valve pressure ajusted i have know idea how to do this mower why it isnt...

Check all electrical connections by removing them, and cleaning all the contacts. Battery, ground to frame, and starter connections. Use a booster battery if you are not sure about the one on board.

Apr 15, 2010 | Garden

1 Answer

Changed ignition switch and put a new battery in now it wont even make a sound was working fine before. but old ignition switch had no keys to it. i was starting with a screwdriver.everything is together...

Different switches can have the terminals in the same place but use them differently. Are the terminal labels identical between the two? Hopefully you made a diagram of the wiring before you made changes. If so, make another diagram showing both switches and what terminals connect in each switch position. Are they the same? If not, figure out how to rewire to get the same functionality. The first mistake in troubleshooting is to think you did everything right. We all suffer the illusions created by memory and our senses which is why we have axioms like "measure twice, cut once".
It worked before you replaced the battery and the switch, therefore doing that work created a problem. The switch using its terminals differently would be a good place to look.
Fortunately MTD has manuals and good stuff on their web site at or at

May 12, 2009 | Mtd Garden

1 Answer

Needed ignition switch so i changed it and now i've got absolutely nothing wont even try to start it's acting like it doesnt have a battery connected

What brand of tractor do you have and what was wrong with the old switch.
Also, a model number and engine would be helpful.
Let me know.

May 12, 2009 | Garden

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