Temperature gauge woes

[OneLapper]

Thanks for updating this thread!   I have the same problem with 4106.  I'm curious to see what you find!

[Len Silva]

The resistance across the gauge is meaningless, except perhaps, to compare it to a known good one of the same exact model.

One thing you can do is to use a variable resistor, connected between the sender terminal on the gauge and ground.  Adjust the resistor for a cold reading on the gauge, measure it and compare it to the sender.  You can then adjust the resister to normal and high readings and note the resistance for each.  That will tell you the sender range you need.

Radio Shack
Model: 271-342  |  Catalog #: 271-342
1K-Ohm 15-Turn PC-Mount Cermet Potentiometer/Trimmer

[gus]

The resistance check you need to make is from the sender body to the water jacket to see if the sender is properly grounded. The check you made is the gage resistance, you have to know what that should be for it to have any meaning.

The next one is the wire from the sender connection to the gage connection(wire only, not through the gage or sender). That should be zero or close.

Then check resistance from the sender post to the water jacket to see if it is the same as the sender spec.

If those are good see if you have proper voltage to the gage with your engine run switch on.

You will probably find the problem in the wiring unless you have the wrong sender.