2007 chevrolet silverado 1500 4.8L electrical issues

[dundee29]

Hi Guys , Thanks in advance for reading my book , just trying to put everything i can think of.

I have a 2007 Chevrolet Silverado 1500 4x4 (4.8L). 110,000 miles very clean truck,engine bay looks as if it came out of the show room. never off road

I am having some random electrical issues . BY random i mean around every 3 days it acts up and then is fine. When this happens i am driving and notice a flicker of my lights. When i get to my destination and turn the key off , all the power is gone and give it a few minutes and it will work perfectly. But its getting a little annoying since i have only owned about 3weeks and i took my old reliable 3500 454 gas hog of the road and its for sale to drive this unpredictable truck. I have researched for a week or so and tried some basics. Just looking for more ideas kinda lost.

 

Parts I have replaced and stuff Ive done . I also joined AAA premium membership the first time in my life because of the issue LOL

1)Mega fuse from GM

2)new ground from battery to block. I roughed all contacts with a wire brush.(getting a good ground ,meter reads the same from battery to block.

3)new fuses and relays in the fuse box(ALL NEW)

4)put a new battery in it and the one replaced was fine full charged ect. Had it checked and put it in the second battery tray unhooked.

5)alternator is working as it should.

 

 

 

 

Stuff i still need to do install or do :

1) I have a new positive battery terminal to install .(i noticed a little corrosion on the factory one cable where the cable meets the terminal.

2) Clean any other grounds besides what i have already done ? what and where?

 

 

 

 

 

 

 

 

 

 

[dundee29]

I forgot to put its a work truck model so no power windows or locks .

[dundee29]

Any ideas guys ?