Diagnosing Temp Gauge Fault

[Bluest]

Im sure this must have been covered before but I've had no luck with the search. What is the process for diagnosing a faulty temp gauge. I guess the fault will either be the sender, the gauge itself or the wiring in between. I have a multimeter so it can't be that hard, can it?

I guess I need to check the resistance of the sender, but what values do I look for? And where is the sender on an F14D?

If the sender checks out, how do I check the gauge?

 

[winston1]

The sender on the F24 is right below the thermostat. Don't know about the F14. A simple test just to see if the sending unit is working at all is to check continuity cold, then crank and see if it changes. If not, the unit is bad. I suppose you are confident you are getting a bad reading?

 

[murphy1244]

To test gauge touch sending wire to ground while someone else watches the gauge. It should peg to max, do not do this test alone you need to touch it and stop or you short out the gauge.

 

[Bluest]

The sender on the F24 is right below the thermostat. Don't know about the F14. A simple test just to see if the sending unit is working at all is to check continuity cold, then crank and see if it changes. If not, the unit is bad. I suppose you are confident you are getting a bad reading?

I'm pretty sure something is wrong, the gauge never moves off cold.

What do you mean by "crank"?

 

[winston1]

I'm pretty sure something is wrong, the gauge never moves off cold.

What do you mean by "crank"?

Start the engine and watch as it warms up.

 

[Bluest]

Start the engine and watch as it warms up.

Cool, thanks. Tempted to pull the sender out and do it with a pan of water.

 

[normde2001]

What murphy said for testing gauge, although no need to worry about shorting gauge. If gauge works, replace sender.

 

[Bluest]

Gauge shot right up when I touched the wire to ground. So I guess the sender is goosed. The hunt begins. Need to measure length, thread etc to see if I can find an equivalent match over here.

 

[winston1]

m16-1.5

 

[Bluest]

m16-1.5

You've got to live this place! Thank you Winston!