[T3] 73 type 3 . The ground tree left side of dash.

[William Jahn]

Just to clarify in the Bentley wiring schematic D will noy show the ground
on the black plug you will only see it looking at the plug and it does tie
in to the 4 way flasher bulb to # 10 and # 12 yet the D schematic does
state 12 is the ground for the fuel gauge and 10 is the ground tree left
upper dash that steel one.

On Tue, Aug 30, 2022 at 9:39 AM William Jahn <willjahn975 at gmail.com> wrote:

> On late models all I ever worked on.The black plastic plug that feeds the
> fuel gauge and Turn indicators ext. For the fuel gauge on this plug there
> is a ground just for the gauge. Meaning it does not rely solely on the
> housing  to dash holding arms for ground.
>
>  What I see as an issue is that the tree is steel, part of the dash. I
> find if I use the 4 ways key off the fuel gauge will jump up and down past
> the reserve red mark . There is a double wire ground to one brass 1/4"
> spade. One to the fuel gauge ground and one to the 4 way switch. Not long
> ago I cleaned the 4 way and headlamp switch contacts. If I reach up and
> pull the brass connector on the tree to clear the connection the jumping
> stops. Since the fuel gauge is sensitive to resistance, if that bad idea
> steel tree connection adds resistance it affects the fuel gauge reading.
>
>  It seems every few months I need to work just that one ground on the
> steel tree.
>  I know my sender works and the gauge  will jump a bit on turns or stops
> and inclines because it's old yet if that ground is clean the gauge reading
> is much more stable.
>
>  Sure the wipers off on this tree as are many other circuits yet they are
> not sensitive like the fuel gauge, I drove yesterday gauge was showing
> between 1/4 and 1/2 tank , drove up a steel drive and it dropped  to just
> over the red reserve.
>
>  Not saying the ground is all of the issue, the sender is old yet still
> reads , it's just more consistent if that one ground is good.  I'm getting
> to the point of finding a better spot  for that one ground something with
> screw and 1/4" brass male under the dash lower lip.
>
>  Every other ground tree is brass other than the steel ground tabs on the
> gauge cases which are mainly for lighting and they never seem to have
> issues.
>
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