R400C Posted September 30, 2013 Share Posted September 30, 2013 Quite a few semi related threads but still haven't found a full answer ... I would like to connect the pre-fitted oil temp sender at the bottom of the dry sump tank to the illusive black/yellow (signal) and black (earth) spade terminals somewhere in the loom. I have the Caterham supplied R400 extension wire(s) (about 40 cm long) but am not sure where to connect them in the engine bay. The most likely point is a single spade terminal located on the loom immediately below the air intake plenum, but it appears to have both the black/yellow and black crimped into it. Is there another point where I will find both a black/yellow terminal and a black terminal ready to connect to, or do I need to cut the black free at the point I have found and crimp on another terminal on the black? My thoughts were that the black/yellow and black wires could have been crimped together to make sure that, without the sender attached, the stack display reads 0 degrees rather than 999, but guessing is always dangerous! Any help or a thread recommendation would be appreciated. Thanks. Link to comment Share on other sites More sharing options...
R400C Posted October 1, 2013 Author Share Posted October 1, 2013 As a second thought, if anyone with a Stack dash car (and a working oil temp display!) is able to take a quick look and let me know where the sensor wire runs to, it might provide a clue. A photo would be even better if anyone has one ... Alternatively, can anyone recommend someone at the factory or in service that I could phone to ask? Is there a build helpline? I'm understandably reluctant to start snipping wires without full guidance Thanks to anyone that can help. Link to comment Share on other sites More sharing options...
Pat the Plumber Posted October 1, 2013 Share Posted October 1, 2013 YHM. Link to comment Share on other sites More sharing options...
akb Posted October 1, 2013 Share Posted October 1, 2013 If you still need help after reading your mail then let me know and I will look and take some pics tomorrow morning. Link to comment Share on other sites More sharing options...
R400C Posted October 2, 2013 Author Share Posted October 2, 2013 Thank you both. Pat, PM sent. Link to comment Share on other sites More sharing options...
akb Posted October 3, 2013 Share Posted October 3, 2013 Hmm. Interesting. I looked at my late 2009 R400 dry sump tank temp sensor wiring. The is a black/yellow, black pair connected to the temp sensor. This cable traces back to the main loom at a branch where the lights also branch. This is NOT a separate sub loom connected back to the wires near the air intake. If I look at the R400 main dash wiring diagram it shows the temp sensor branching off the loom with a label of B 6 / BY 161. If I look at the stack dash loom diagram I see that there is a similar branch labelled B 6 / BY 170. Looking under the plenum I have two pairs of blade connections: Brown / Black, White / Black Black / Yellow, Black Neither are connected - just tied out of the way. I can't see either of these are on the R400 diagrams I seem to remember that the loom changed around that time and the diagram in the build manual was out of date. Perhaps call / email Sean Cummerson at seanc@caterham.co.uk. He was super helpful during my build. Good luck Andy Link to comment Share on other sites More sharing options...
akb Posted October 3, 2013 Share Posted October 3, 2013 The dry sump installation addendum to the build manual says: "If a stack dash is fitted, the oil temperature sensor on the oil tank should be plugged into the loom. (If the loom is too short an extension loom may be required)." Link to comment Share on other sites More sharing options...
R400C Posted October 3, 2013 Author Share Posted October 3, 2013 That's great info. At least that eliminates the spade connectors that I had found under the plenum (exactly as you describe them above). I'll take another look near where the lights branch from the loom and call Sean as you suggest. Thanks to both you and Pat for the diagram. Link to comment Share on other sites More sharing options...
R400C Posted October 5, 2013 Author Share Posted October 5, 2013 Sorted. The spade terminals were actually tie wrapped all the way back below the air filter just in front of the bulkhead! With A couple of tie wraps removed, the short wires reach the left hand side of the engine bay and then the Caterham supplied R400 temp sender loom extension is required to reach the sender at the bottom of the dry sump tank. The most amazing part is that the 5 year old sender that has never been connected works perfectly! So I now have a spare stack sender on the shelf which can't be a bad thing. Can anyone now advise me on the normal operating temps for oil in the bottom of the dry sump tank? I'm guessing it will be 10-15 degrees below peak circulation temp so maybe 80-100 norm and max 105? Link to comment Share on other sites More sharing options...
akb Posted October 6, 2013 Share Posted October 6, 2013 Normal driving is 50-70 with the highest I have ever seen on a track day around high 90s Link to comment Share on other sites More sharing options...
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