Jyrki Posted August 22, 2004 Share Posted August 22, 2004 The gas gauge on my 46 Roadmaster works fine when the engine is not running, but every time the engine is running, even when parked, the needle swings rapidly back and forth through the whole sweep, making it impossible to figure out an average reading. Is it supposed to act like this, or what gives?Thanks,Jyrki Link to comment Share on other sites More sharing options...
56 Buickboy Posted August 23, 2004 Share Posted August 23, 2004 The problem is possibly a loose wire or terminal on the back of the fuel gauge or at the fuel tank sender unit.When the car is running there maybe enough vibration to make the terminal connect and disconnect, causing the fluctuation in the reading.When the car is not running the terminal is steady and gives an accurate reading. Link to comment Share on other sites More sharing options...
chub chub Posted August 23, 2004 Share Posted August 23, 2004 check where the wires run through the body. if the wires are exposed there, they will rub the body causing an erratic signal. Link to comment Share on other sites More sharing options...
Jyrki Posted August 26, 2004 Author Share Posted August 26, 2004 Thanks for the suggestions. At least now I know it shouldn't be like that!All wires are new. It could also be the voltage drop - I converted from 6V to 12V system, and are using a voltage drop for gas gauge. I will let you know if I can find the cause. Thanks. Link to comment Share on other sites More sharing options...
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