99 f150 gauges sweep at start up. had a bad battery but i replaced it and it still does every now and then. and my alternator is 7 months old. just put an new starter and solenoid on a week ago. cant figure it out!

 

^ sweep?

 

check your bat. connections??

mine only do that when the bat is bout low and i had a good battery but crappy connections and tightened em down and it was fixed

 

Every guage (or the tachometer and speedometer) go from the lowest part of the guage then max out and the back to the low part; or they sweep across.

 

Had mine do that last week before I replaced the battery. Was only getting 10.5 v with a bad cell.

 

I had a car that did the same thing when I turned the key to start it.
All of the gauges would peg to far right.
The gauges always worked fine when it started so I never did anything about it.
Battery check is a good idea.
Somewhere you probably have a bad ground connection.
Do the gauges work with the engine running?
If so you got GREMLINS!

 

Mine did that when the battery got low. Eventually had to get a new battery. Like they said, check the connections, clean the connections too, make sure all the acid is out of there so you have good contact with the battery.

 

so since everyones sayin bat. problem just recheck your cables and what not

 

It did it after i changed my starter and solenoid. The battery ended being bad. But replaced it and it started doin it again. I think i just change my baat terminals cuz they just look wore out and go from there. I think its my connections.
Thank guys for your help!!!

 

k sweet you had the same as mine..mine were corroded and didnt tighten all the way when the bolt was as tight as it could go....let us know if it was actually the terminals