Hello everyone.

I have an 05 F150 that I recently got a code for faulty fuel injector on cylinder 4. I decided to check if it was dirty or just not working so I disconnected everything while inspecting the truck. After putting everything back together, I went to start the truck but it won't turn on at all. It does go to accesory mode but it will not start. Could this be due to the inertia switch that's next to the fuse box? I checked the fuse but it seemed to be okay.

 

What happens when you turn the key to Start? Does the starter turn the engine over, or does nothing happen?

 

Nothing happens.

 

When i turn the key it doesn't do anything and cluster turns off.

 

Dead battery or dirty terminals, or incorrectly connected. Possibly the MLPS (neutral safety switch). If it were the inertia switch it should still crank.