Backwards temp gauge or incorrect sender?

[jpowell86]

I put a new thermostat and temp sender in my 2003 farm pro 2430. Before the new stuff the temp gauge would always go all the over to the right below 40 and stay there no matter how log I ran the tractor. With the new sender in; the gauge is working but appears to work backwards. Any ideas? I've already tried swapping wires on the back and that didn't help.

 

[greg_g]

Below 40? Are you talking coolant temperature - or oil pressure?

//greg//

 

[jpowell86]

Below 40? Are you talking coolant temperature - or oil pressure?

//greg//

Definitely coolant temp. With the old sender it would start to left without power. When power was turned on at ignition the needle would go all the way right below 40 Celsius and never move. With the new sender the needle on the gauge starts at the left and comes toward the center as the engine comes to temp.

 

[Bob Rooks]

40°C is equal to 104°F.

 

[Bob Rooks]

Definitely coolant temp. With the old sender it would start to left without power. Please clarify. What does that mean?

When power was turned on at key switch the needle would go all the way right below 40 Celsius and never move. Are you saying it pegged the needle?

With the new sender the needle on the gauge starts at the left and comes toward the center as the engine comes to temp. This would be correct. What is the reading on the gauge at that point?

12345

 

[jpowell86]

Maybe an image will help. That was taken with no power to it.

With the new sender In It starts in the same position when there is power. When it is warming up it goes toward the right.

With the old sender it would be at the left without power and move all the way to the right with power. When the engine was warmed up it never moved.

 

[Rich Waugh]

Goofiest looking gauge I ever saw. Highest reading is at rest and then it goes to a lower reading, apparently. Looks kinda like they printed the gauge face backwards, doesn't it?

I think that if I was faced with something like that I'd chuck the gauge and sender both and replace them with an aftermarket mechanical gauge I could both understand and believe in.

Rich

 

[jpowell86]

I'd say that the sender was bad and you've got it working OK now. Your operating temperature should be somewhere around 85*C. Disregard the backward movement and the resting spot of 100*C without power. That's common meter operation. The scale is simply reversed and its operation seems to be on par with any working system. To clarify my thinking on this:

1) power off - meter full left

2) power on with cold engine - meter near or past full right

3) power on with engine warming up to temperature - meter moves toward middle (from 40*) as engine warms

4) power on with engine up to operating temperature - meter near 80* midscale

If this is what you observe, you're in good shape! If not, go the mechanical gauge route as suggested.

Currently with the new sensor in the needle starts at 100 cold and moves toward 80 as it is coming to temp.

 

[Diamondpilot]

Your gauge is backwards of mine on my 284. I think the gauge is printed backwards.

Chris

 

[jpowell86]

That's why I mention the history behind the gauge's past operation. Could it be a problem that originated during manufacture? It almost seems that way.

I've looked at the gauges on affordable's web site and they look pretty much the same. 100 on far left and 40 on far right.

 

[greg_g]

I've looked at the gauges on affordable's web site and they look pretty much the same. 100 on far left and 40 on far right.

Not what I'm accustomed to seeing either. I suggest reversing the wires on the back of the gauge itself

//greg//

 

[Affordable]

Sorry I was out of pocket My daughter had a baby Friday (my First Grand Baby) The OEM gauges are just like jpowells,the 2-different sending units are The old type for the single gauge,New type for the instrument cluster gauge.I have not ever seen one of these work backwards ? But It should start on the right and as the temp goes up move to the left.With the original gauge pegging out when the key was turned on it's leading me to a wiring /grounding problem.

If you want to try a different sender let me know

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

 

[jpowell86]

Sorry I was out of pocket My daughter had a baby Friday (my First Grand Baby) The OEM gauges are just like jpowells,the 2-different sending units are The old type for the single gauge,New type for the instrument cluster gauge.I have not ever seen one of these work backwards ? But It should start on the right and as the temp goes up move to the left.With the original gauge pegging out when the key was turned on it's leading me to a wiring /grounding problem.

If you want to try a different sender let me know

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

Tommy,

Congratulations on the grand baby. The new one I got from you is shorter than the old one that I pulled out. I don't know if that will help tell the difference between the old and new ones.

 

[Diamondpilot]

I've looked at the gauges on affordable's web site and they look pretty much the same. 100 on far left and 40 on far right.

I wonder then if you have the wrong sending unit? Or maybe if its fairly cheap just get a new matched sender and gauge. It can not be that much?

Chris

 

[Bob Rooks]

Be done with it! MECHANICAL WATER TEMPERATURE GAUGE 2" - JCWhitney and maybe: TEMPERATURE SENDER ADAPTER - JCWhitney

This thread would have undoubtedly been a whole lot shorter if the pic had appeared in the first post. Who would have originally guessed that the gauge read from right to left.

CONGRATS TOMMY!

 

[robert421960]

I've looked at the gauges on affordable's web site and they look pretty much the same. 100 on far left and 40 on far right.

this is identical to mine
switch off it sits to the left
switch on it goes to the right below 40
but when warming up it rises from there to 80 or 85 like others said

 

[Turbo]

there are two type of sending units .

example : if you have a 100 ohm gage the sending unit can be set up from
0 ohms to 100 ohms as the temp rises or 100 ohms to 0 ohms as the temp rises. it depend on the Gage deflection.
you need to change your sending unit., or the gage.

 

[jpowell86]

Might as well replace the gauge. I would think that it would cost less than trying to drain coolant out.

 

[greg_g]

Might as well replace the gauge.

Without even checking to see if it's wired in backwards?

//greg//

 

[jpowell86]

Without even checking to see if it's wired in backwards?

//greg//

It works the same with the wires either way.