alanius Posted January 11, 2011 Share Posted January 11, 2011 Hello,I have in my defender 90 300Tdi a Td5 dash (incl gauges) but the water temp gauge doesn't work right. So the sensor in the engine block isn't right I guess. Because when the engine is on the right temp, the temp gauge stands complete in the red zone.Does any one knows which water temp sensor I need to have to correct temperature on my gauge?For wiring I use the loom from a defender ROW spec 300Tdi.Thanks!RegardsAlain Quote Link to comment Share on other sites More sharing options...
landroversforever Posted January 11, 2011 Share Posted January 11, 2011 You want the 'green' top temp sender I think. I have the TD5 gauges waiting to be fitted, this is the one I was told I needed HTH. Quote Link to comment Share on other sites More sharing options...
cookie64 Posted January 11, 2011 Share Posted January 11, 2011 yep green top sender is what you need Code~: AMR1425 Also check you have good contuinuity on the sender cable as this screwed me over, then if you have to replace make sure you replace properly so it still goes through the speedo, i shortcutted and went straight to the guage then somebody pointed out that was why my guage was reading too hot still lol (thick moment) Tom Quote Link to comment Share on other sites More sharing options...
alanius Posted January 11, 2011 Author Share Posted January 11, 2011 thanks!!! @cookie, I use the original wiring loom for the engine and dashbord for a ROW spec 300Tdi, I use original LR connectors so there should be no problem I guess? Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted January 11, 2011 Share Posted January 11, 2011 If you have a ROW-spec wiring loom (behind the dash) then the signal should be passed through the speedo head before connecting to the gauge, so that should be OK. Sender is AMR1425 as above, get a genuine one as the pattern ones are not as good. The gauge works on resistance, no resistance (ie. short to ground) would be full deflection on the gauge, or full hot if you will. Full resistance (open circuit) means the gauge won't move at all, so full cold. The sender decreases in resistance as water temperature increases. So if you gauge is reading too hot, then there is too much resistance, this could be due to either having the wrong sender (check to see if there's a green plastic ring on it like this) or some extra resistance in the wiring loom (dodgy connection etc.). Hope that helps. Quote Link to comment Share on other sites More sharing options...
alanius Posted January 11, 2011 Author Share Posted January 11, 2011 I understand what you mean! the gauge works perfect, but it is the wrong sender. The scale isn't correct, the red zone is when the engine has his normal temp. I will test this asap! Thanks for the information!!! Quote Link to comment Share on other sites More sharing options...
RRSailor Posted August 16, 2016 Share Posted August 16, 2016 Hi Guys I know that one very old - sorry for that - but can not sort it out 300 Tdi in RRC from 1983 dashboard Green water temp sender - new 300 Tdi with no AC - there was one but taken off currently Second termostat already placed in and ... Gauge goes to red zone :/// Quote Link to comment Share on other sites More sharing options...
landroversforever Posted August 16, 2016 Share Posted August 16, 2016 You need the original sender from the old engine, as that will be matched to your old gauge. Quote Link to comment Share on other sites More sharing options...
RRSailor Posted August 17, 2016 Share Posted August 17, 2016 You need the original sender from the old engine, as that will be matched to your old gauge. Thank you! Quote Link to comment Share on other sites More sharing options...
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