Water Temperature Gauge

[MikeE]

My Griff has non standard BDO instruments and the water temperature gauge has started to over read (I think) so assuming it might be the sender.

Do Wedges have the VDO water temp gauge like this?



If so can anyone point me in the direction of a new VDO sender? Also are these gauges still available?

Thanks!

[MikeE]

ElvisWedgeman said:

Have you tried to calibrate your existing gauge to your temperature sender. I’m guessing the problem is that it’s reading too high when the temperature is in fact lower.

That’s correct it’s over reading. Do you know how I recalibrate the gauge?

[MikeE]

ElvisWedgeman said:

MikeE said:

ElvisWedgeman said:

Have you tried to calibrate your existing gauge to your temperature sender. I’m guessing the problem is that it’s reading too high when the temperature is in fact lower.

That’s correct it’s over reading. Do you know how I recalibrate the gauge?

To calibrate your gauge to the sender you need to fit an in line resistor to the supply wire to the sender. You can either buy an inline adjustable resistor or order several in line resistors and use them to get the correct setting. To achieve the correct setting you need to fit the adjustable resistor in line to the feed wire and touch the feed wire to earth momentarily so as the reading on the clock just reaches maximum but not over, or the desired setting on the gauge. You can then adjust the adjustable resistor to the required setting. At that point you know that the maximum power supply to the clock is the maximum desired reading on the clock. You can also achieve this by fitting in line fixed resistors by trial and error. I hope that makes sense. I did this on a previous wedge I used to own and was very successful and accurate.

Edited by ElvisWedgeman on Monday 27th June 21:06

Thanks that makes perfect sense. One question though, why has it suddenly decided to over read by 20C ?

[MikeE]

Thanks for all the info guys.

I haven't had a chance to take the sender out and pop it in a kettle to see the gauge reading yet. But when I touched the (single) wire on the sensor it was very loose. I pulled it off and ground it and the gauge went over 120C. I've nipped the spade connector up, cleared the sender connection and put it back on the sender and it's now a tight fit. Thought I would run the engine up later and see if it's still going over 100C without the fans kicking in (I've already determined the fans kick in if I put the otter in a kettle)