Go to the toolbar at the top of the page, click on 'service manuals"
Download the 2014-2019 TRX420 FA1 FA2 FA5 FA6 TM1 TE1 FM1 FM2 FE1 Service Manual
Go to page 13-20
You'll need something like this. You can make your own or buy one.
https://www.ebay.com/itm/144190959908
Use OEM parts or chinese amazon/ebay stuff? If you're using anything but OEM parts, first thing to do is put your original parts back on to start troubleshooting.
Thanks for the reply. I have a neutral light. I have replaced everything that you had listed except the stator. Checked the stator and was within the specs. I am out of ideas. I know the machine had sat for a period of time. Is there anything that I am over looking. Oh, also replaced the kill switch. Same result