Hey I am new here and i really need some help. I have a 1984 fullsize Blazer and i have been trying to chase down this electrical problem for about a month and it is really annoying. Whenever I go over speedbump or turn too hard to the right, my radio flickers and turns on and off. It is not the radio because this is the second one I've tried. Also, It is much more sensitive when I have the headlights on to where little bumps in the road will set it off. There has recently been some flickering of the headlights along with it. The motor has been swapped by a newer diesel from an 84 to an 86 by a previous owner. I have checked the grounds, the starter, and the alternator. I have also read that there should be grounds from each of the batteries to the frame but both of my batteries only have one ground, one on the block and one on the alternator bracket. Thank you very much for any suggestions.
-Andy

 

It sounds to me like you are missing the ground strap that goes on the rear passenger head to the frame

 

Dang I completely forgot about that one. I just checked and the braided cable is dangling from the firewall. So where on the back of the head does it connect? Thank you very much!

 

There are a couple holes in the back of the he I belive they are a M-10X1.25 thread

 

Awesome.. I just replaced it with a 4 gauge ground wire and that did the trick. Thank you for your help.

 

Np good luck with your rig