Lights keep flickering and battery light blinking on and off. bought new battery. problem still there

possible light control module fault or bad ground at battery cable or light relay grounds

Possible bad connection on the battery?

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You may have overlooked the importance of the GROUND for the engine. Make sure the grounds on the batteries are clean and tight and also the ground from the battery to the engine block AND the frame of the truck.

After connecting battery, try using key in drivers door to lock, and /or unlock. Try passenger if that doesn't work, as well as valet key if it came with one.

Hi

Yes it sounds like the alternator voltage regulator is wearing down and needs to be changed or replaced.

If you can get your hands on a 12 volt multimeter, turn the setting to 20 dc and place the negative wire on the negative battery post and the positive wire on the positive battery post.


The battery with motor off should be 12.6 volts and higher, start the the car the read out should be 14.,2 or higher.


You can turn the lights and heater on to see if the alternator can cope with the load.


if read out is less then you need to change or replace it.

Cheers

Check your AC Adapter plug. If it's damaged, you may be getting intermittent breaks in contact. If you're not sure if it's damaged or not, pull your battery and try to boot up with just the AC Adapter plugged in. If it doesn't shut off, it's probably a bad battery. If it does, you need to get another AC Adapter or have the plug on the machine replaced.

It could possibility be bad or loose connection on the alternator or battery wiring, or a loose alternator belt. All those lights come on when the battery isn't getting a charge, so the alternator is where I'd start looking.

If the light is flickering and not just becoming brighter or dimmer with engine rpm, I'd suspect an electrical short, possibly between the battery and alternator or inside the alternator itself. have the alternator output checked before going further with diagnosis and before it fails completely and becomes more difficult to diagnose.