Have a 99 f150,
My wife had a dead battery last week when she went to start the truck. got it going and on the way home said that all the gauges were going wacky and bouncing around. I got home from plowing and it started right up no problem. next day i went to start it and nothing. went out today and put a charger on it for a couple hours. started up and the gauges were wacky for a bit and then fine. however the battery gauge it all the way to the high side. I also noticed a little battery fluid leaking out the top of the batt. (did i over charge it?) loooking for any ideas as to where i should start troubleshooting. Battery is only about 5 months old and all connections at the battery are clean and tight.
thanks

 

ok,
Just took it for a drive. Seems to make the gauges jump around when i step on the gas. Also when i let off and it idles down a bit the batt gauge goes back into the normal range and the batt light gotes off but the heater fan which i had on seemed to diminiish as well. when i stepped back on the gas the heater fan kicked right back into high gear.
I also noticed that i can not get it to go into 4 wheel drive. I have the dial to turn it into 4 wheel so i dont know if that is a related issue or not. did not have the 4 wheel problem till just now either so i am guessing related!! Help me please. I am thinking maybe alternator but i dont know.
thanks