Cat_J Posted February 15, 2014 Share Posted February 15, 2014 Hi all, I'm starting work on my new wiring harness soon but have spotted a strange circuit (or lack of) in the main wiring diagram. The engine is a 200TDI and I'm referring to the 2.5 litre diesel wiring diagram. I see that 79 is the oil pressure sensor and 69 the guage which is fine, all the ciruits to them make sence. But then I noticed 53 and 38 which are oil pressure sensor (again) and oil pressure warning light, this has an earth after the sensor and appears to connect to a dotted line only, at the other end. So the dotted line has me confused, i'm not actually sure what its supposed to denote. I thought at first it was superficial and just grouped the warning lights together but this is the only possible +ve for that light so it must have some purpose. Also this makes me think there are 2 pressure sensors becuase one is labelled 79 and the other 53 but I only know of the one in the filter housing. I have a lot of experience actually building wiring harnesses as its my job, but none designing one from original ciruitory. Most of it seems pretty straignt forward as you would expect on a defender but i'm a bit lost with this bit. any help would be appreciated, i'm sure there are many here who have done this before. Thanks EDIT: Actually the other thing that made me thing there are two pressure sensors is the fact that the oil pressure indicator one must be variable whereas I would think the one for the warning light would have to be a cut off switch at a certain pressure. Unless the light attached the the guage or something. Quote Link to comment Share on other sites More sharing options...
AndrewHorsfield Posted February 15, 2014 Share Posted February 15, 2014 I am just finishing a 2.5NA to 200tdi swap myself. The 2.5NA had a 1 x Oil Pressure sender and 1 x Oil Temperature sender. Both are mounted in the oil filter housing. The Oil temp sender (and gauge) are military spec. for when the vehicle spends a lot of time stationary charging batteries. I have transferred the Temp sender to the 200tdi without problem (so I do not have to mess around removing the gauge). I hope this helps Quote Link to comment Share on other sites More sharing options...
western Posted February 15, 2014 Share Posted February 15, 2014 dotted line IIRC is for non UK vehicles, wiring route is slightly different, you don't need that bit of the diagram. there can be 2 pressure senders -- 1 for the warning light & 1 to operate the oil pressure gauge. Quote Link to comment Share on other sites More sharing options...
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