I have a two year old John Deere D-130 Lawn Tractor that Will turn over but will not start it seems to be an ignition problem of some sort (NO fire to spark plugs

These Briggs has two diode in the coil ground leads.

Here is few things that can cause this problem.

• Short to ground in the wiring
• Both diodes are shorted.
• 12v is somehow being applied to the coil circuit shorting the diodes and destroying the coil packs.
• Bad ignition switch keeping the coil packs grounded.

Step 1:
Start testing by first disconnecting both coil packs ground wires. If the engine now starts and runs you at least the coil packs are okay. If doesn't then both coil packs are bad. In this case don't reconnect until you can verify that 12v isn't being applied momentarily when operating the ignition switch. Proceed to step if the engine now starts.

Step 2:
Then reconnect the ground wires and disconnect the engine that feeds the coil packs and the fuel shut shut off solenoid and retest.
If the engine starts and runs. Then reconnect the harness to shut the engine down. This would mean that there either a bad ignition switch or a short in the wiring on the mower side and not in the engine side.
If it doesn't start start now after starting previously replace the diodes in the wiring harness paying attention to proper orientation of the diodes or replace the harness.