Quote:
Originally Posted by 66clow
Extending this with another question. I replaced my sending unit. Guage has never worked. I get no power at the fuse box at the tan wire with power on or off. Grounding the fuse box tan wire does nothing at the fuse box. I attached a wire from power to the fuse box tan wire and the guage goes full? Where could the problem be? Thanks
|
Your power to the fuel gauge comes from the fuse panel on a pink wire which runs to the no. 3 terminal on the cluster plug. Key on only.
The tan wire at the fuse panel is just a junction point for the sending unit wire to connect to the gauge. You should read 12 volts there if you have power to the gauge even though it has nothing connected. When you jump it to ground you will get current flow through the gauge to ground with no resistance which simulates an empty fuel tank. Remember the sender range is 0hms empty, and 90 ohms full.
When you put power on the tan wire you are back feeding the gauge
and it is reading through the gauge resistor to the gauge ground which deflects the needle to full. You need to concentrate on why you aren't getting 12 volts to your gauge resistor on the right hand terminal.
The power for the fuel gauge also powers the brake warning light. Try grounding the brown wire on the proportioning valve and see if the brake warning light comes on. the temperature gauge also gets power from the gas gauge but it may not move unless the coolant heats up. If it has power you could ground the temp sender wire on the engine and the temp gauge should go full hot.
What ever you do, do not put any power on the wire that goes to the sending unit into the tank. The resistor on the sender might glow and heat up enough to ignite the fumes in the tank. NOT GOOD.