So I have a 2000 Ford F-150 5.4v8 and I checked spark plug 2 and 3 to see if they needed to be replaced along with the others that have already been replaced and tapped too. I placed them back in their cylinders and made sure they were cleaned. Now when I turn the truck to the position I have power but right when I turn it to start, I get no response and the power goes out. Any suggestions?

 

First, have your battery load tested. It sounds like it went south.

Secondly, make sure you didn't disturb a ground wire/strap.

Good luck...

 

Also make sure the battery cable connections are clean of corrosion. I have had to cut an inch or so off my ground cable and reclamp it a couple of times becaues the copper core wire was corroding.