[89cubcadet1772]

Confirm you are also getting proper 12v on your crank signal circuit to the solenoid on your starter. I assume they put in push button because of an issue with the ignition switch, probably wired the push button right from the battery
+ to the solenoid on starter?. I also did the upgrade on mine but had to install a relay because ignition switch was not providing enough juice to engage the solenoid fully.