Posted January 4, 200817 yr I have a 79' model DT175 which I'm getting ready for registration. The oil light (2 stroke tank under side cover)is on all the time. I have pulled out the switch and checked the operation of the contacts which seem OK. The switch has 3 wires going to it ( I could not work out why it needed 3 wires?) and on closer inspection I found that there is a diode inside a resin type of plug in the top of the switches rubber top. I checked the diode and it seems OK. ( I'm an Electrician) When I disconnect the diode the switch works OK. I would like to know what the diodes purpose in life is?? Why would you need a diode across what should be a simple switch?? Thanks Mark
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