OK so I previously had an electrical problem where my batteries(yes batterIES, I have and audio system) were only charging at 12-13v. long story short I fixed everything by replacing factory grounds, doing big 3, replacing BCM and ignition switch. Now my batteries are in the 14's.

NOW for the real issue. after i did all of that all of my interior lights dim like crazy, never goes above 13.5v and when I use my door locks or power windows it drops all the way down to like 11ish volts. and headlights dim like crazy.

so from what I know about electrical sound like another ground issue, so my question is there like an interior ground or something? How do I fix this????

PLEASE HELP!!!!!

 

What year, make, model etc for starters? I know the ground under the fuse box under the hood can cause all sorts of issues. If that's corroded or lose it'll mess up all the relays, fuses etc in that fuse box.

 

I'm sorry it's a 2000 blazer 2 dr. I will check the ground on the fuse box.

 

i can find the ground on the fuse box under the hood. there a a few diff wires under there and they all have loom on them.

can anyone tell me exactly where to look??

 

I can't remember how many bolts hold that fuse box down but after you get them out you should be able to lift the box & see a ground wire for the fuse box. If the ground is buggered up the relays & fuses will only have + power & won't work.

 

I took off the fuse box under the hood and couldnt find a ground. I took pics...maybe im looking in the wrong spot......