Truck not starting up

There has got to be a huge starter relay. No way all those start amps are going thru the cab push button.

I'd check the connections on that 1st.

 

Ive been considering that

 

So what was it? I have a similar issue.

 

There is a brake light fuse in the interior fuse box (under the steer wheel) check that.
I had this same problem when I wired my taillights backwards and blew the fuse.

First time turning the turn the truck on, I heard a click from underneath me and then the truck would never crank over.
Replaced the fuse and it works fine. These trucks have a check to make sure the brake like circuit is working before they fire up.

*EDIT: I said this because it seems possible with you also have light bar issues. not sure how you have everything wired but worth a quick check

 

Thanks. My problem is intermittent so it’s been a bitch to find. Maybe brake light switch?

 

IDK it worked fine shortly after...

 

My rear LED bar which stopped working a week or so before the ignition started messing up now works well and the ignition doesn't really fail anymore