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Cattle Boards
Trucks, Tractors & Machinery
case fuel gauge
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<blockquote data-quote="lavacarancher" data-source="post: 1050517" data-attributes="member: 9198"><p>Fuel gauges are pretty simple devices, at least in older designs. I wish I could draw you a picture (schematic) but I'll try to explain how they work and you can troubleshoot it.</p><p></p><p>+12v from the ignition switch is applied to one side of the gauge. The other connection on the gauge goes to the sending unit located inside the tank. This device is a variable resistor that changes resistance when the float moves up and down because of fuel level changes. This change in resistance causes more or less current to flow through the gauge and indicates a proportional amount of fuel. Oh yea, the sending unit has one wire attached to it coming from the gauge. The other side of the sending unit is ground. </p><p></p><p>To troubleshoot start by disconnecting the wire from the gauge to the sending unit. Gauge should drop to "empty". If this works, take the sending unit out of the tank (carefully), connect the wire from the gauge to the connection on the sending unit and add a jumper wire from the metal sending unit to tractor ground. Gauge should respond. Move the float up and down and gauge should respond accordingly. If all this works then the sending unit was shorted to the tractor ground. Maybe you can see where this short is and fix it. If it doesn't work there are two possibilities. One, the sending unit is defective (shorted) or two, the gauge and sending unit are not matched.</p><p></p><p>Good luck</p></blockquote><p></p>
[QUOTE="lavacarancher, post: 1050517, member: 9198"] Fuel gauges are pretty simple devices, at least in older designs. I wish I could draw you a picture (schematic) but I'll try to explain how they work and you can troubleshoot it. +12v from the ignition switch is applied to one side of the gauge. The other connection on the gauge goes to the sending unit located inside the tank. This device is a variable resistor that changes resistance when the float moves up and down because of fuel level changes. This change in resistance causes more or less current to flow through the gauge and indicates a proportional amount of fuel. Oh yea, the sending unit has one wire attached to it coming from the gauge. The other side of the sending unit is ground. To troubleshoot start by disconnecting the wire from the gauge to the sending unit. Gauge should drop to "empty". If this works, take the sending unit out of the tank (carefully), connect the wire from the gauge to the connection on the sending unit and add a jumper wire from the metal sending unit to tractor ground. Gauge should respond. Move the float up and down and gauge should respond accordingly. If all this works then the sending unit was shorted to the tractor ground. Maybe you can see where this short is and fix it. If it doesn't work there are two possibilities. One, the sending unit is defective (shorted) or two, the gauge and sending unit are not matched. Good luck [/QUOTE]
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