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post #1 of (permalink) Old 06-26-2001, 10:56 PM
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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??

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post #2 of (permalink) Old 06-28-2001, 03:40 AM
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Re: Fuel Gage Question

Thermal bi-metal switching driver for fuel and temp analog
bi-metal indicators.

See diagram switch driver is fixed ohmic value terminates
across +12 vdc on instr.combo it opens and closes
continously at rate that is proportional +12 vdc instrcombo
supply, provides a stable base line between two analog
meter indicators and switch control action prevents thermal
indicator runaway which would occur if thermal indicators
were not switched also adds damping effect to analog
indicators that operate in high shock enviroment.

Excuse poor spelling lack of grammer skills
Ebays self appointed english prof. says my english sucks




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post #3 of (permalink) Old 06-28-2001, 09:28 PM
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Re: Fuel Gage Question

right on! that makes sense. Appreciate the info. thanks,
benjamin401

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