Have you confirmed the battery is good? Does everything dim or stop when the key is in the start position? Have you tried starting it in neutral? I believe the button on the shifter is for tow/haul.
First, lets confirm the battery has enough power to turn or engage the starter. Here is a link that explains how to load test the battery at home:
If the battery tests good, confirm the starter fuse is good and the starter relay is good. See pic 1. In addition to checking the fuse, use a test light to confirm there is power in and out of the fuse.
As far as the relay, if there is another relay with the same part number, switch them. If there isn't, here is a link that explains how to test it:
If that all checks good, there is one more test. I need you to check for power to the smaller wire on the starter when the key is in the start position. Here is a link that explains how that is done. Note that the larger black wire will have 12v at all times. The smaller wire will only have 12v when the key is in the start position.
Let me know what you find.
Tuesday, May 26th, 2020 AT 8:58 PM