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have a hasvqvarana rz4623 replaced the engine with kohler courage 23hp which was the same model on the mower from start, replaced the wiring harness since old was bad, replaced battery with 360 cca, replaced solenoid. when trying to start there is clip from solenoid. but can take jump box and jump engine off going directly to starter and it will run. but when turn off and try to start it will not start, any help would be a great help

thanks

You need to verify the ignition circuit is working, if this happened after your engine swap something is amiss in the wiring - use a test light and verify the switch is working properly

new wiring harness

replaced switch still no start, but there is a drop of 1.5 volts drop on the battery when voltage checked on the back side of the solenoid

bypass the solenoid and see it it kicks over