Mazda B2200 turns oil light

Friends, I have a Mazda B2200 R2 Mazda truck that for a while now turning the oil indicator light, if someone has the electrical diagram I would appreciate it ...

Hello friend, first take the oil pressure, if the indicator bulb is fine, when when you get old, you usually present that fault, by the manual test in these pages, bookaller.net and automecanico.com, you have to register but it is easy and free, I hope it is helpful, a hug.

Thank you for responding, initially when starting in cold turns, then it goes out, I take the precion taking the bulb of cold oil 65PSI and when it heats 45psi it goes out, now it does not go out, the one that is firing is not the bulb, it is the precion valbule and I am not afraid and I am worried to continue using like this ..