I have a 99 expy with 134k on her. She also has the 5.4, 4wd. My question is this. My wife left the lights on and killed the battery. After I jumped it all of the guages would sweep to max then back to 0. A couple of seconds later the normal idle and guage readings would return. I have replaced the battery but the sweeping continues. is this an electrical problem or is it related to the battery?

 

This previous post covered alot of ground - hope it helps:

https://www.ford-trucks.com/forums/3...nitialize.html

 

Your battery is flat. Flat batteries can do all sorts of weird things, hell it could even test good. I doubt it could be charged and recover, time for a new one.. GL man

 

He said he replaced the battery up in post #1.

 

oops..battery issue is the only time i've ever seen the gauges do this..alternator all good too?

 

That might be a poor ground at the battery. Did you clean the clamps at the post connections when you replaced the battery?