Troll Hunter Posted May 31, 2015 Share Posted May 31, 2015 Hi, all, I've just bought a coolant low level detector, as above, which arrived in a blue box! How should this work? Using my multimeter connected to the two terminals I can't detect any difference - continuity or non-continuity - when I raise and lower the float. Am I missing something, or has the "blue box syndrome" struck again? Mike Quote Link to comment Share on other sites More sharing options...
mmgemini Posted May 31, 2015 Share Posted May 31, 2015 You need to read this and the link in here http://forum.difflock.com/viewtopic.php?t=10972&highlite=300tdi+coolant=level+switch Quote Link to comment Share on other sites More sharing options...
western Posted May 31, 2015 Share Posted May 31, 2015 & this alternative http://forums.lr4x4.com/index.php?showtopic=15271 Quote Link to comment Share on other sites More sharing options...
Sheffield Posted May 31, 2015 Share Posted May 31, 2015 I think the sensor should change from a few meg ohms to about 680 ohms, but it will not like switching a relay, even assuming you can get one to react to this sort of change. I used a transistorised relay from Interface Solutions, part IS M 12T, which will sense the change without loading the sensor and will drive an indicator. Cost me about £13 a couple of years ago, and has worked fine since. Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted May 31, 2015 Share Posted May 31, 2015 Just for balance, the last prc7925 I bought which was either Beramach or Almakes was a simple reed switch operated by a magnet in the float, it measures open circuit when the float is at the bottom ( no coolant) and zero ohms when the float is at the top (coolant full) wave a compass near it and you should see the magnet make the needle flicker. HTH Quote Link to comment Share on other sites More sharing options...
dailysleaze Posted May 31, 2015 Share Posted May 31, 2015 Another link http://www.landroverexpedition.com/technical/300tdi-low-coolant-alarm When you raise and lower the float, you should hear the switch contacts click open and close if you listen carefully Quote Link to comment Share on other sites More sharing options...
Troll Hunter Posted June 2, 2015 Author Share Posted June 2, 2015 Many thanks for your replies, links and tips. Mike Quote Link to comment Share on other sites More sharing options...
Maverik Posted June 3, 2015 Share Posted June 3, 2015 I found a black box made my British layland that works with the grey coolant level cap, its in a thread somewhere, will have a look for it. Quote Link to comment Share on other sites More sharing options...
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