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Username Post: Electrical headache        (Topic#352146)
Posts: 1

Reg: 07-22-18
07-22-18 01:35 PM - Post#2740800    

Hi I’m new here and I am tired of beating my head up against the wall. I have read several forms and done a lot of research but still cannot figure out what is going on with my 68 impala. As far as I can figure it has to be some ground issue that I am not finding. When I turn my headlights on my gas gauge goes down, one turn signal light on the dashboard glows, the clock stops working. I don’t have bright tail lights on one side. (I’m currently working on changing the bulbs and cleaning up the sockets. The wire harness is new). My headlight switch is new. Can I get some advice on what else I should be looking at?


Ultra Senior Member
Posts: 11270
Reg: 03-25-05
07-22-18 01:53 PM - Post#2740802    
    In response to 68ImpalaGal

You are probably missing a ground strap on the instrument cluster. The gauges are mounted on a plastic housing and require a ground strap or wire, for the gauges, to the metal part of the dash.
Cleaning the sockets and making sure of a good ground for the sockets should fix the tail lights.

66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)

Posts: 9
Loc: 07932
Reg: 01-28-17
11-26-18 10:39 AM - Post#2752419    
    In response to 68ImpalaGal

The deal where tail lights aren't bright on one side... This is a fairly common situation and it often happens that when you step on the brakes, that side goes out altogether. This is caused by a no ground on that light socket. What happens is that when just the tail lights are on, that tail light will reach a ground on the other side by having current go through both brake light filaments and reaching the ground on the other side. When you step on the brakes, the brake light filament on the other side is made "hot" on the side that the current was coming to. So, the "dim" side now has no way of reaching ground and it goes out.


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