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Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure. You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops. You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.
You have a sensor that controls this. It is a temp sensor. It could be called something else, but it is a sensor that measures your engine temps. It would shut the vehicle off if it is not working properly.
G'day mate there is also a main fuse with high amp fuses located near battery check each fuses by pulling out and checking for condition ie loose wobbly also weird as it may seem i have found a number of vehicles in which the ants have made a nest in the fuse box/s, dont know why just found it od , what they do is ends up with tracks to earth from nest for positive curciut, try that.
ok let me help you get started
this isnt going to be easy we need to do a bunch of testing.
you will need a 12 volt test light.
remove the negitive battery cable and connect one side of your test light to the battery negitive and the other side to the battery cable . and with the key off.. so now if you have a short some where the light should be lit. now what we have to do is start to pull fuses untill the light goes out. and when you find the fuse that is causing your short and drain your battery . then we have to look into the section of the wiring and components.
let me know what you find
electrical problem. take the truck to the dealer and have the computer checked / reprogrammed. unfortunately, your average mechanic cannot reprogram the computer. have you noticed any other problem that would point in the direction of an electrical problem (lights, radio, lighter, etc.)?