Lately when i start my truck it starts and all my gauges go all the way down and bounce. Had my battery checked and it had a bad cell so i got a new one now today i started my truck and same thing happen. What could this be.2004 4x4 supercrew 5.4 3V.

 

Assuming that your truck starts??? Had a similar problem, except my gauges were bouncing all over the place, with my truck and it turned out to be a bad alternator.