SkillyHerald Posted June 21, 2021 Report Share Posted June 21, 2021 An update on why running my SMART fan has such an effect on the temp - it doesn't. The reading on the temp gauge does drop almost a 1/4 but so does he fuel gauge. I'm running with an original dynamo and turning the fan on to max must be dropping the voltage of the whole system, including the stabiliser. I have however changed my thermostat to an 82C from the original 73C - no real change - normal running showing just over 3/4. Changing to a new Red GTR106 drops this to bob-on the 3/4 mark, which will have to do. Link to comment Share on other sites More sharing options...
johny Posted June 21, 2021 Report Share Posted June 21, 2021 wow that would be an explanation but I thought you'd see some illumination of the ignition light as the system voltage must be really dropping cos the stabiliser should be able to cope down to around 10.5v... Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 21, 2021 Report Share Posted June 21, 2021 a red top GTR106 is not the correct specified sender for our stabilised gauges any triumph supplier of repute will sell GTR108 for stabilised use Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted June 22, 2021 Report Share Posted June 22, 2021 16 hours ago, SkillyHerald said: An update on why running my SMART fan has such an effect on the temp - it doesn't. The reading on the temp gauge does drop almost a 1/4 but so does he fuel gauge. I'm running with an original dynamo and turning the fan on to max must be dropping the voltage of the whole system, including the stabiliser. That's what I was querying a couple of pages back, when I asked about putting the blower fan on. It sounds like the output is dropping due to the increased load, and so all the gauges drop accordingly. The temperature is still the same. Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 22, 2021 Report Share Posted June 22, 2021 yes echo that that that that Ha Pete Link to comment Share on other sites More sharing options...
Steve P Posted July 4, 2021 Report Share Posted July 4, 2021 My new 1500 engine in the Herald runs at 3/4 on the gauge whereas the old 1300 engine ran at half way max.I bought 2 x 108 senders from different suppliers to test with an Ohm meter. 1 reads 680 ohms,the other 880 from the spade to the sensor when cold,this must give a different reading on the car between the 2. Steve Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 4, 2021 Report Share Posted July 4, 2021 what colours are the insulators ? engine capacity/type has no bearing on the sender is the new engine earthed diffently to the old one ?? have you checked the stabiliser output voltage ?? agree both senders at the same temperature should give the same resisitance (if thay are actually the same ) Link to comment Share on other sites More sharing options...
cliff.b Posted July 4, 2021 Author Report Share Posted July 4, 2021 5 hours ago, Steve P said: My new 1500 engine in the Herald runs at 3/4 on the gauge whereas the old 1300 engine ran at half way max.I bought 2 x 108 senders from different suppliers to test with an Ohm meter. 1 reads 680 ohms,the other 880 from the spade to the sensor when cold,this must give a different reading on the car between the 2. Steve I have just checked my incorrect sender with a red insulator and it is reading 400ohms at room temp. That sender generally showed the temp at about 3/4 whereas the replacement 108 with black insulator sits just below 1/2. Do you still have the old engine? If so, what resistance is the sender from that? Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 4, 2021 Report Share Posted July 4, 2021 to me the red top is non stabilised (can be totally sure , are there any product numbers on the units ??? Pete Link to comment Share on other sites More sharing options...
cliff.b Posted July 4, 2021 Author Report Share Posted July 4, 2021 48 minutes ago, Pete Lewis said: to me the red top is non stabilised (can be totally sure , are there any product numbers on the units ??? Pete The red top one that I removed has no markings apart from AVP & UK. Link to comment Share on other sites More sharing options...
Clive Posted July 5, 2021 Report Share Posted July 5, 2021 17 hours ago, Steve P said: My new 1500 engine in the Herald runs at 3/4 on the gauge whereas the old 1300 engine ran at half way max.I bought 2 x 108 senders from different suppliers to test with an Ohm meter. 1 reads 680 ohms,the other 880 from the spade to the sensor when cold,this must give a different reading on the car between the 2. Steve Steve, the resistance changes very fast, especially at the lower end of the temp range. At 80 degrees is should be under 100ohms ( I can't remember the exact resistance) Link to comment Share on other sites More sharing options...
cliff.b Posted July 5, 2021 Author Report Share Posted July 5, 2021 43 minutes ago, clive said: Steve, the resistance changes very fast, especially at the lower end of the temp range. At 80 degrees is should be under 100ohms ( I can't remember the exact resistance) My replacement sender was 110 ohms at 85C when I tested it and that made the gauge just below halfway. The first one that I was supplied (which was a lrc106) was 80 ohms at the same temp & the gauge read just under 3/4. Link to comment Share on other sites More sharing options...
JohnD Posted July 5, 2021 Report Share Posted July 5, 2021 I think I've posted these before, but why not again, given the above. Sensor responses, even new, can be highly variable. This shows the dial reading with two diffrent new sensors. And can deteriorate quite quickly: This shows the resistance of some sensors, old and new. I tested these by putting the sensors in a water bath and heating that on a camp stove, while I monitored the guage reading or resistance: You can do this on the bench as shown, or in the car if you set up your stove an water bath beside it. Use long wires to connect the test sensor to the loom and earth. John Link to comment Share on other sites More sharing options...
Steve P Posted July 5, 2021 Report Share Posted July 5, 2021 21 hours ago, cliff.b said: Do you still have the old engine? If so, what resistance is the sender from that? No,sold on e bay for 40 quid. As for markings on the new ones,one has none,the other has the following..FAE then 31210 and also 035. No idea.Both have black tops. I don`t think the stabiliser is faulty as i have never had a problem with the fuel gauge which is fairly accurate. Steve Link to comment Share on other sites More sharing options...
cliff.b Posted July 5, 2021 Author Report Share Posted July 5, 2021 1 hour ago, Steve P said: No,sold on e bay for 40 quid. As for markings on the new ones,one has none,the other has the following..FAE then 31210 and also 035. No idea.Both have black tops. I don`t think the stabiliser is faulty as i have never had a problem with the fuel gauge which is fairly accurate. Steve Have you tried the new sender with the higher resistance in the car yet? If so, what does the gauge read? Link to comment Share on other sites More sharing options...
Steve P Posted July 6, 2021 Report Share Posted July 6, 2021 Not fitted either new one yet been busy with work and Grandaughters birthday,party to come on Saturday in our garden due to space,oh joy 20 odd 6 year olds around.Grumpy in my old age. Steve Link to comment Share on other sites More sharing options...
Steve P Posted August 1, 2021 Report Share Posted August 1, 2021 Update on this,i removed the one on the car that read 3/4 during normal running,the resistance of that one was 780 ohms ish,(different every time i tested it). I had the 2 new ones,i fitted the one with the lower resistance (600 ish ohms). Went for a 20 mile run and the gauge now sits at 1/3 and pretty much stayed there.I am going to leave this one in and see what happens. Steve Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now