Pettifordo Posted October 29, 2022 Report Share Posted October 29, 2022 The oil light on my car isn’t working. I have removed the wire from the sensor and had a test light connected with ignition on and nothing there (assume it should be live). Any good ideas how to trace back what is wrong (I’ve had all the dash out as part of the rebuild but didn’t remove the wiring loom. Ignition light works and I’ve check the small fuse box with the 3 fuses in. Link to comment Share on other sites More sharing options...
johny Posted October 29, 2022 Report Share Posted October 29, 2022 sounds like a blown bulb? Try putting the sensor wire to earth rather than a test light... Ive just gone to LED bulbs for this as brighter and hopefully long lasting. Link to comment Share on other sites More sharing options...
AlanT Posted October 30, 2022 Report Share Posted October 30, 2022 Did your car have dual braking @Pettifordo? Think it would have for a 1980. The oil and PDWA lights are linked, I believe. If you’ve gone single system (as looks like it) without a PDWA then the circuit isn’t complete. Check the wiring plan to be sure. May need to copy what the Haynes manual says for a single line brake Spit from about 1977 Link to comment Share on other sites More sharing options...
AlanT Posted October 30, 2022 Report Share Posted October 30, 2022 https://www.triumphexp.com/forum/spitfire-and-gt6-forum.8/pdwa-and-oil-pressure-light-relationship.1841022/ Link to comment Share on other sites More sharing options...
NonMember Posted October 30, 2022 Report Share Posted October 30, 2022 37 minutes ago, AlanT said: The oil and PDWA lights are linked, I believe. If you’ve gone single system (as looks like it) without a PDWA then the circuit isn’t complete. Only "incomplete" in the sense that it doesn't have a PDWA to signal brake failure. The bulbs are in series and will both illuminate when the oil pressure warning is on, as was the original behaviour. If @Pettifordodoesn't want the brake warning light then it can simply be bypassed (connect the two wires together) to get the single circuit brakes condition. Link to comment Share on other sites More sharing options...
Pete Lewis Posted October 30, 2022 Report Share Posted October 30, 2022 yes the connection between low oil psi and PDWA was to test the buld when you switch on otherwise if the bulb blew you would never know of a impending brake failure till you heard the Bang Pete Link to comment Share on other sites More sharing options...
chrishawley Posted October 31, 2022 Report Share Posted October 31, 2022 Just for my own education: If a Spit has PDWA, does that necessitate a special type of oil pressure switch rather than the standard single terminal one? Link to comment Share on other sites More sharing options...
Pete Lewis Posted October 31, 2022 Report Share Posted October 31, 2022 no its just a std PL switch its just the brake fail light is linked in to show the bulb /circuit to the pdwa is operational till the oil pressure kicks in and all works as normal Link to comment Share on other sites More sharing options...
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