Fuel Gage Question
Ok, I have an 88 sammy. The fuel gage is simple: theres a small metal bendable plate in there with a wire wrapped around it. The wire gets anything from zero to +12 volts to it. At zero volts, the metal plate is cold and the gage reads empty. At +12 volts the plate bends to its max degree, and moves the pointer so the gage reads full. A rheostat back at the fuel tank sends this variable volage (zero volts when empty, 6 volts when 1/2 tank, 12 volts at full, etc) to the gage and VOILA: we know how much gas is in the talk.
HERES my question. Theres ANOTHER small metal plate in the gage assembly too, with another wire wrapped around it. At +12 volts (ie, full tank) the 2cd plate bends, but what IT does is OPEN a set of separate contacts. So, running down the road normally, the tank has some gas in it, and those contacts are open. at SOME point as gas runs low, I'm figuring those contacts shut, energising SOMETHING./ Anyone know exactly what that set of contacts does? I was thinking a low gas warning light, but the 88 sammy doesn't HAVE a low fuel warning light. Anyone know for sure??