jrose

Active Member

• Sep 21, 2019

• #1

Afternoon all, I was out driving yesterday evening and as it got dark I switched on my instrument panel light, as i did, the engine temperature shot up from its usual half way to near the red zone, turned it off and the temperature went back to normal, anyone had this happen, obviously the engine temp was fine, just a bit odd.

 

marjon

Well-Known Member

Full Member

• Sep 21, 2019

• #2

Have you been in amongst it recently and done anything?

If not I would suspect an earth issue first or a wire short. Behind the dash perhaps.

Bit of investigation needed me thinks

Good luck

J

 

W

Webley1991

Well-Known Member

• Sep 21, 2019

• #3

It sounds like there could be a short in the wiring somewhere behind the panel. This is causing extra voltage to be fed to the gauge when the instrument panel light is on.

Seems that I was typing at the same time as the above poster.

 

marjon

Well-Known Member

Full Member

• Sep 21, 2019

• #4

It happens.

But at least two answers the same so a good place to start.

J

 

ExMil109

Active Member

• Sep 21, 2019

• #5

Check that the speedo earth connection is clean and tight. If the speedo earth isn't good, the current through the bulb in the speedo can affect the voltage stabiliser for the gauges (which is bolted to the back of the speedo) and make the readings increase. If the earth is suspect, you might find the speedo bulb is a bit dim as well (although they're not exactly bright at the best of times)

 

Bobsticle

De Villes Advocaat

• Sep 21, 2019

• #6

I had a similar thing happen. I scratched a large pentagon in the floor, lit a fire and sacrificed next doors guinea pig to Swarf, God of the Series.

Still does it.

 

C

Colthebrummie

Well-Known Member

• Sep 22, 2019

• #7

Did the fuel guage mis read also?

Col

 

N

nickjaxe

Well-Known Member

• Sep 23, 2019

• #8

Volt stabilizer may have been by-passed.