No Temp Registering 4.3 LX

[MPII]

I have a 1992 Merc. LX. I was getting no tempt reading. I checked the guage and it is working, at least when I (briefly) cross to ground. The guage will go up and down once released.

So, I thought, it must be the sending unit. Replaced it with brand new one. But still nothing. Thermostat?

 

[Alpheus]

Re: No Temp Registering 4.3 LX

Run a continuity check from the wire that connects to the sensor to the sense wire that connects to the gauge...

 

[MPII]

Re: No Temp Registering 4.3 LX

Sorry, I didn't put that in, I did. I took aligator clips from the wire ont he sensor the back of the gauge and got no resistance My bad....

 

[CheeseCutter]

Re: No Temp Registering 4.3 LX

Check to make sure the base of the sensor is grounding by testing for continuity from the base of the sensor to a good ground. You also need to make sure you have the special t-stat gasket installed that has the four brass "rivets" in it. Those are there to provide continuity to ground from the sensor. Hope that helps.

 

[MPII]

Re: No Temp Registering 4.3 LX

So, if I have tested the gauge and it works, replaced the sensor with a brand new one, what's left? Merc's service manual says this motor should 140, does it matter whether it gets there or not?????

 

[fuzzybob]

Re: No Temp Registering 4.3 LX

Read CheeseCutters post again...check the ground from the sensor base to the block.

 

[MPII]

Re: No Temp Registering 4.3 LX

Got it, should have picked up on that the first time. Thanks!