Battery loses charge while driving. Won't

open or shorted alternator circuit (control wire)
let your auto store test the alternator charging
on and off the truck.
inspect 3 wire connector for burn or lose connection
disconnect 3 pin wire and start the engine.if the light stay on you have shot to ground.

Check your new battery and alternator. May be new, but I have gone through 3 new alternators to find a working "new" alternator.

You need a new regulator, or you have a bad ground to your battery.

I'm sorry to say it could be the computer.
The computer controls idle speed as well as alternator output.
If the check engine light is on you should get it scanned for trouble codes.

Have you checked the alternator, I work at a auto parts store and see this all the time, check the inline fuel filter, also have your checked the coil, mine went out and that was the last thing I checked but am back on the road.

Hello and welcome to FixYa!

If the battery light is on, I strongly suggest that you have the battery charged. It can be an indication of a weak battery or a faulty alternator. If the battery light still on after charging then the problem will surely be on the alternator itself. If that's the case the alternator should be replaced to resolve the problem.

If the battery won't hold charge even on a new alternator then the problem will be on the battery itself. It surely is in the end of it's service life and replacement will be necessary.

You may try to reset it to by removing the positive battery connector, letting it sit for at least 5mins. then reconnect it again. This will reset the system and can get the battery light off.

Hope this helps and thank you for using FixYa! Have a good one!

If you have a voltmeter check the voltage at the battery with the motor running. It should be about 14- 14.5 volts. If not the alternator is bad.
Sorry, hope this helps.

Your altenator is broken or the belt that drives it is loose or broken.

If the battery is loosing power as you drive it,then the alternator has gone bad,this is what charges the battery,and the engine will also not run correctly if it is not charging.

Check all connections. You may have a loose wire or defective alternator