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

[William Jahn]

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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