Gauges not reading temps
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Joined: Jan 2015
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Gauges not reading temps
I have several autometer gauges (wired by previous owner).
1) EGT gauge (works fine)
2) Transmission temp (lights up but needle doesn't move)
3) Oil temp (lights up but needle doesn't move)
4) Coolant temp (lights up but needle doesn't move)
5) Boost (works fine)
The gauges are daisy chained together and can't figure out why the 2 gauges work fine but the temp gauges don't. I checked to make sure the temp gauges are all connected to oil pan, coolant and tranny and they appear tight on their connections with no corrosion to prevent good connections. Everything seems good with wiring.
Lets pretend the tranny connecter is corroded and not making a good contact. Would this cause the other two gauges not to read since it's daisy chained together?
I first noticed the temps not registering in the dead of winter and thought that it was so cold that things only got up to 100 degrees. Now that the temps have warmed up a bit I should be seeing 180-190 degrees on coolant
(at least that where it ran when it was working fine in warm weather). At a loss and don't know where to start hunting now.
1) EGT gauge (works fine)
2) Transmission temp (lights up but needle doesn't move)
3) Oil temp (lights up but needle doesn't move)
4) Coolant temp (lights up but needle doesn't move)
5) Boost (works fine)
The gauges are daisy chained together and can't figure out why the 2 gauges work fine but the temp gauges don't. I checked to make sure the temp gauges are all connected to oil pan, coolant and tranny and they appear tight on their connections with no corrosion to prevent good connections. Everything seems good with wiring.
Lets pretend the tranny connecter is corroded and not making a good contact. Would this cause the other two gauges not to read since it's daisy chained together?
I first noticed the temps not registering in the dead of winter and thought that it was so cold that things only got up to 100 degrees. Now that the temps have warmed up a bit I should be seeing 180-190 degrees on coolant
(at least that where it ran when it was working fine in warm weather). At a loss and don't know where to start hunting now.
More Turbo
Joined: Sep 2014
Posts: 620
Likes: 0
From: Waco, Texas
It sounds like perhaps the power for the gauges is daisychained. The sensor input would have to be separate unless you're using some kind of data bus with addressing. I highly doubt that's the case. The first thing I'd check, since they light up, are the wires coming from the sensors in the correct spot? I know you said all was good with wiring but if the sensor wires are backwards, you're likely to get no data out of them.
If my assumption that it's just power/lighting that's chained is true, a bad sensor for one gauge should no affect the rest of the gauges on the chain.
If my assumption that it's just power/lighting that's chained is true, a bad sensor for one gauge should no affect the rest of the gauges on the chain.
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
The sensors for the gauges that are not working are pretty easy to get at....test them with a multimeter after getting her warmed up. Then hook them back up and test again from the wires leading to the back of the gauge.
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