1993 NAS temp gauge issue - Defender Source
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  #1  
Old August 21st, 2016, 12:28 AM
Tyler Wirken
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1993 NAS temp gauge issue

I am working on a gals 110 helping her get it ready to sell and while test driving it I noticed the temp gauge was not working. Did some research and found an article on ECR's site about the signal conditioner in NAS 110's that fakes out the gauge to read lower temps. So anyway, I decided to do the upgrade and get rid of the signal conditioner circuit board. So I bought a new sender and a new gauge according to what the article stated. Removed the conditioner and sure as the world the circuit was smoked.

So I swapped out the gauge hooked it up and it immediately reads right below middle on the gauge. Engine was cold. Then after only a few minutes of running it went directly to the right and pegged out past the red.

Checked Rovers North to ensure I had the proper gauge and sender and in do.

Any idea what might be wrong? Did I get a bad gauge? Even took a jumper wire straight from the sender to the gauge just in case of a working problem. Nothing.

I know it's hooked up right as you can't mess it up with both leads being one male and one female. Now at first the only ground hooked up to the gauge was via the circuit board. So the first time I hooked up the gauge there was no ground on it. Then I saw a ground not holed up near by and put that on the mounting post of the gauge. Worked better but still not right.

Any thoughts? Should have been an easy fix.

Thanks
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  #2  
Old August 21st, 2016, 09:51 AM
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For all that work, I would've put in a gauge that reads the actual temperature.

What does a color mean anyway?

What is the actual temp of the motor? Anyway, sounds like its still a ground issue.


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  #3  
Old August 21st, 2016, 10:04 AM
Tyler Wirken
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Yeah I'm just trying to put it back to stock. Not sure of the actual temp of the motor but there is no way when the truck was sitting overnight in 75 degree temps that the gauge should read in the middle. Then it ran for only like 5 minutes max and the gauge was maxed out. So definitely an issue.

Ground was my next thing to check. I was going to run a jumper to a known good ground and see what happens.

The only thing it could be is a bad gauge perhaps?
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Old August 21st, 2016, 10:19 AM
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Replace sender with D90 one?
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Old August 21st, 2016, 11:06 AM
Tyler Wirken
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Yes I believe I did.

Here are the two parts I ordered.

Went with non genuine on the gauge but it is the same as a D-90 according to RN's site.
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  #6  
Old August 21st, 2016, 02:06 PM
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resistance of gauge and sender aren't properly matched
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  #7  
Old August 21st, 2016, 03:09 PM
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Maybe try the old gauge with the new sender.
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Old August 21st, 2016, 05:16 PM
Tyler Wirken
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Quote:
Originally Posted by Uncle Douglas View Post
resistance of gauge and sender aren't properly matched
Thanks for the help. I am new to these sort of things. So how matched do they need to be? Exact?

Also tried it with the old gauge. It was better. At least this time it started out in the cold range but after about 3 minutes or so it quickly went to red. Radiator is cold to touch so stat didn't even open yet. So we are closer but still not right.

Thanks.

------ Follow up post added August 21st, 2016 04:18 PM ------

Also in ECR's article on this it says you need the "white" sender. Anyone know what that means? I plugged in the part number they gave for it into both AB and RN websites and it cross referenced to the sender I bought new so I assumed it was correct.
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Old August 21st, 2016, 05:26 PM
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My understanding is you need both the gauge and the sender from a 94-95 NAS D90. I don't know part numbers off the top of my head.
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  #10  
Old August 21st, 2016, 06:38 PM
Tyler Wirken
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Quote:
Originally Posted by evilfij View Post
My understanding is you need both the gauge and the sender from a 94-95 NAS D90. I don't know part numbers off the top of my head.
I thought that is what I bought from RN. Didn't work.
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