Dannyb Posted May 26, 2021 Share Posted May 26, 2021 Does anyone have the resistance readings for a lucas water temperature sender. 1500 Spit. Danny Quote Link to comment Share on other sites More sharing options...
Ben Hutchings Posted May 27, 2021 Share Posted May 27, 2021 I had a look in the forum archive but nothing there. A web search returned this which you might have already seen: http://www.triumphspitfire.com/gauges.html I guess what you really need is for someone to test a ‘known good’ sender (GTR108?) in a pan of water, thermometer and multimeter 😅 Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 27, 2021 Share Posted May 27, 2021 I did that measurement once - when I had a dodgy sender on the Toledo - but can't remember what the values were. I vaguely recall about 1Kohm cold but not whether that was the good or the bad sender 🤔 Quote Link to comment Share on other sites More sharing options...
Clive Posted May 27, 2021 Share Posted May 27, 2021 On 26/05/2021 at 08:46, Dannyb said: Does anyone have the resistance readings for a lucas water temperature sender. 1500 Spit. Danny I will try some tonight. Should be accurate, will use a megger and a digi thermometer. What temp range? I guess I could get down to something close to zero, and realistically up to 90degrees. (had a problem with my gauge not matching the ford sender, in the end found a genuine nos lucas one that works perfectly, but 1/8npt thread suitable for my engine) Quote Link to comment Share on other sites More sharing options...
Dannyb Posted May 27, 2021 Author Share Posted May 27, 2021 Thanks Clive. The gauge does not match the actual water temperature. I was also looking at the adjustable senders although the are a bit expensive. Danny. Quote Link to comment Share on other sites More sharing options...
Clive Posted May 27, 2021 Share Posted May 27, 2021 Right, got the megger, got the thermometer. What is missing is teh sensor I had a couple of weeks ago. A search has so far been fruitless, but will look again in the morning. I was sure it was on a shelf in the garage.... Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 27, 2021 Share Posted May 27, 2021 The senders fitted to my Spitfire and my Vitesse both read 1.4Kohms when cold, if that's any help. Quote Link to comment Share on other sites More sharing options...
Dannyb Posted May 27, 2021 Author Share Posted May 27, 2021 I'm Tring to find thr resistance at normal temperature. Danny Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 27, 2021 Share Posted May 27, 2021 Well, if the weather's nice tomorrow I'll take the Spitfire out and get it up to normal temperature, then I can measure it again. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 28, 2021 Share Posted May 28, 2021 OK so I went out for drive (to get my second jab) and after parking back up at home the sender measured at 70ohms. That's probably mid-scale but may have crept up a fraction with heat soak (as I'd stopped the engine maybe a minute before measuring). Quote Link to comment Share on other sites More sharing options...
Dannyb Posted May 28, 2021 Author Share Posted May 28, 2021 6 hours ago, RobPearce said: OK so I went out for drive (to get my second jab) and after parking back up at home the sender measured at 70ohms. That's probably mid-scale but may have crept up a fraction with heat soak (as I'd stopped the engine maybe a minute before measuring). Thanks Rob. That's interesting asim sure mine is measuring a lot more. I will get a potentiometer and set it to 70 ohms and see where the dial reads. Danny Quote Link to comment Share on other sites More sharing options...
Spitfire6 Posted May 31, 2021 Share Posted May 31, 2021 On 28/05/2021 at 18:33, Dannyb said: Thanks Rob. That's interesting asim sure mine is measuring a lot more. I will get a potentiometer and set it to 70 ohms and see where the dial reads. Danny Make sure your POT can handle the current. Or Pooof. Quote Link to comment Share on other sites More sharing options...
Dannyb Posted May 31, 2021 Author Share Posted May 31, 2021 1 hour ago, Spitfire6 said: Make sure your POT can handle the current. Or Pooof. Got to watch out for the pooofs 😂 Quote Link to comment Share on other sites More sharing options...
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