Don't know where to begin
So I recently replaced both batteries. My battery light on the dash board is still coming on. I took my truck to my local autoparts store to have the alternator checked out. After doing some test with the truck on he tells me I have a bad voltage regulator in my alterator. So it basically comes down to me needing a new alternator.
Here is were it gets tricky. On my edge cts I'm having my ficm voltage drop to 40v when I hit the skinny pedal hard. But it always remains at 48v when I'm idling and starting the truck up.
Don't feel like throwing money on parts I don't need. So I'm lost on where to begin. Should I change my alternator? Ficm? Or both?. Could it be that the bad alternator is causing the ficm voltage go down? Or maye even bad wires?.
Btw, truck is a 2006 f250,6.0,88,000 miles,completely stock, single alternator