Ok, here's the thing(s)

My 2003 F-350 7.3PS SD w/146,000 is acting up,

I put the truck in reverse the radio turns off, take it out of reverse and the radio comes back on.
I accelerate and the head and dash lights go dim as well as the batter light flickers, let of the throttle and the lights go really bright, and on a few occasions the dash needles all peg out, go dead, peg out, go dead and then go back to normal.
If I am listing to a AM radio station and I accelerate I get a buzzing sound through the speakers.

Now, about a year ago the OEM alternator fried, and I mean FRIED smoke and all,
I replaced it and had no issues until just recently.
I was thinking it was the batteries, I have a computer station setup for work stuff and I had left the AC converter on over the weekend and drained the batteries dead, charged them and had them tested, they came back as good.

I am guessing that alll the issues are related to the same problem.

So with good batteries, and a new(ish) alternator, what else could be the issue?

Please tell me its the batteries or the alternator, because if its the board I am going to have to roll it off the nearest cliff.

Dazed and more dazed,
Thank you all in advance for your wisdom and help.

 

I would be checking all of my battery cables, especially the ground cables for starters. A bad ground can cause some crazy results.

 

Sounds like I will be getting dirty in about 10 minutes, I cant' believe I didn't think of that, always the snake right in front of you. Will be getting back to you on the results.
Thanks

 

It sound like an alt problem, can you take it off and load test it?

Where are you located, I live in Parker and have AE. We could set up a time and I can see what codes if any are being set and what your voltages are.

 

I live in Lakewood, what part of Parker, North or South end, closer to I25 or Parker Rd?

 

I live near the rec center in Parker so basically in the middle. PM me and we can set up a time to meet up.

 

Way to go Andrew.