Water Temp Gauge swap: something is wrong - Defender Source
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  #1  
Old November 24th, 2015, 08:36 AM
WG_moots
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Wilmer
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Water Temp Gauge swap: something is wrong

I finally got around to swapping out the water temperature gauge and sensor from stock to VDO. I didn't have time to swap the sensor so I had to drive around for a day with the mismatched sensor and gauge. AT this time the gauge didn't move much and hovered at around 100F

Last night I got around to swapping out the sensor and got everything cleaned up. I turn the key and the gauge goes straight to the max with the engine off:

I took the dash apart again and double checked all the connections. Re-read the install thread to make sure I wasn't missing anything. Everything looked good ... I'm stumped.

Any ideas? Maybe I need to rerun the ground??

thanks.
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  #2  
Old November 24th, 2015, 08:46 AM
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Which sensor did you use? Did you use teflon tape?
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Old November 24th, 2015, 09:00 AM
WG_moots
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Quote:
Originally Posted by BlackField View Post
Whick sensor did you use? Did you use teflon tape?
I used the sensor that came with the VDO gauge. I did not use teflon tape ...
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  #4  
Old November 24th, 2015, 09:11 AM
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Robert Davis
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Oscar makes an excellent point which is are you sure the sending unit is adequately grounded.
Also VDO gauges cannot be wired like the stock gauges using the stock wiring.
They require separate power and ground wires to get a correct reading.
For the gauge to peg, the wire from the sender is generally grounded, but drawing a ground through the gauge can also cause the needle to peg.
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Old November 24th, 2015, 09:49 AM
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Take the sensor wire at the sender and disconnect it. See where the gauge goes. Then ground it and see where the gauge goes. This will verify that the wiring is good.

Maybe take a pic of the gauge connections and post it up.
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Old November 24th, 2015, 12:04 PM
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Quote:
Originally Posted by rdavisinva View Post
Also VDO gauges cannot be wired like the stock gauges using the stock wiring. They require separate power and ground wires to get a correct reading. For the gauge to peg, the wire from the sender is generally grounded, but drawing a ground through the gauge can also cause the needle to peg.
There is only one ground connection point for the gauge. How/where do you connect the second ground for the sensor? On mine i ran all the gauges 100% off the stock wiring. I also took the time to go through the entire harness and cleaned all ground connections to chassis and body, I also replaced the chassis to block ground and battery to chassis wires. I did all this work at the same time as my chassis replacement and in the 15000 miles since have yet have any electrical problems.
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  #7  
Old November 24th, 2015, 12:14 PM
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As red90 says disconnect sender wire and touch it to ground you should get full deflection of the gauge, if this a single wire sender, if it's a two wire sender it needs to be earthed. The single wire sender earths it self to the engine. If the sender wire is disconnected and you still get full deflection you have a short in that wire. Run a new temporary wire from the gauge sender input of the gauge to the sender to check.
It's not rocket science. If it's still wonky you gots a duff unit
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Old November 24th, 2015, 12:30 PM
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Here is how I wired it ... I'm thinking that I should have connected it to the top where it seems to be isolated by the black rubber:
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Old November 24th, 2015, 12:32 PM
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That is a single wire sensor but it attaches to the tip of the sender. You are just grounding it out like that.

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Old November 24th, 2015, 12:35 PM
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Quote:
Originally Posted by WG_moots View Post
Here is how I wired it ... I'm thinking that I should have connected it to the top where it seems to be isolated by the black rubber:
Yeah, you pretty much just grounded the sender. that T slot on the top is where you want to slide a female spade type connector on to.



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Old November 24th, 2015, 12:46 PM
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Quote:
Originally Posted by WG_moots View Post
Here is how I wired it ... I'm thinking that I should have connected it to the top where it seems to be isolated by the black rubber:
Sorry couldn't help it,
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  #12  
Old November 24th, 2015, 02:14 PM
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is right ...

thanks for the help. I thought it didn't look right ... and obviously, didn't work wired that way.
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