adam wahler wrote:
>
> Guys-
> Replaced my bottom radiator hose with a s/s one with thermostat from Moss
> Europe. It works great fan goes off and on when its supposed to. However,
> my gauge reads high. In addition when my gas level drops below half, the
> gauge goes to E. I have replaced the sending unit 3 times, and figure that
> between these two problems it has to be the voltage stabilizer. Is this
> true? Also, my tach decided to stop functioning saturday night. CHecked the
> cable, and it seems to be connected, however the end attached to the car
> seems a little frayed (slightly off) from its connector on the car. It is
> not hanging off, it is merely able to be "jiggled" in its connector the
> cable that is, not the steel screw on connector. Do you think its the cable
> or the gauge itself? Let me know..
>
> Adam S. Wahler
> 1967 TR4A IRS
Interesting that you mention your guages reading high. Mine were too.
The temp was near the end of the scale when operating normally. The gas
guage would register off the scale when full and would plummet when
indicating half a tank. The last quarter of a tank would never last as
long as the first quarter.
Here is my solution. On the back of the speedo there should be a ground
wire. I'm not sure where it comes from but there was two black wires on
the connector. I had forgotten to put this wire back on after removing
the speedo. As soon as I put the wire on, the temp guage read in mid
scale and a full tank was below the full line. On the empty line I still
have over a gallon of fuel left in the tank.
Without the ground, the voltage regulator is putting out a five volt
level with reference to it's poor ground. With reference to the
chassis/battery ground the level is higher. The gauges will then read on
the high side. I haven't done the technical side of this but I intend to
measure voltages with and without the ground and resistances of the
senders ( I have the fuel sender readings), and the guage current
requirements. When I get this done, we should all have a better idea of
how these all work.
So, in the meantime check the voltage on the stabilizer from the output
to the frame of the speedo (should be 5V). Also check from the output to
a good gound (should be 5V). If the latter is higher, you have a poor
ground. If the former is higher, look for a new stabilizer or buy a five
volt regulator (Radio Shack?).
Vic Whitmore
76 Spitfire
Thornhill, Ontario
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