[DeTomaso] Water temp gauge question

[Steven Edwards1969Dart]

The water temp gauge was not working in the 72 that I am working on. It was stuck on 90 and would not move.

I bought a new 90-260 water temp gauge and a sending unit that would work with the gauge. I installed both, sending unit in tank.

When you run the key the gauge now maxes out to the right 60 degrees.
So I check the system;
Gauge is grounded
Gauge has 12 vdc to it
The red w/blk wire has continuity for the gauge to the sending unit
Tank to body has continuity
Bung to body has continuity
Bung to base of sending unit has continuity
Base to stud does not have continuity, which it shouldn’t have until it warms up to operating temp.
I check the sending unit wire to body, no continuity, so wire is not grounded to body anywhere. 
When I touch the wire to body the gauge moves to max
Then I put the wire on the sending unit and it maxes out, engine is off and cold.

I am in need of guidance to what is going on here. I am at a lose as to what is happening.

Steven Edwards

-------------- next part --------------
   The water temp gauge was not working in the 72 that I am working on. It
   was stuck on 90 and would not move.


   I bought a new 90-260 water temp gauge and a sending unit that would
   work with the gauge. I installed both, sending unit in tank.


   When you run the key the gauge now maxes out to the right 60 degrees.

   So I check the system;

   Gauge is grounded

   Gauge has 12 vdc to it

   The red w/blk wire has continuity for the gauge to the sending unit

   Tank to body has continuity

   Bung to body has continuity

   Bung to base of sending unit has continuity

   Base to stud does not have continuity, which it shouldn't have until it
   warms up to operating temp.

   I check the sending unit wire to body, no continuity, so wire is not
   grounded to body anywhere.

   When I touch the wire to body the gauge moves to max

   Then I put the wire on the sending unit and it maxes out, engine is off
   and cold.


   I am in need of guidance to what is going on here. I am at a lose as to
   what is happening.


   Steven Edwards