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I have a 64 malibu and just recently i ahve noticed that i can read my fuel gauge fine during the day but when i turn my lights on in the car the fuel drops down to e like i shut off the car. All other electrical works. Wait except for my dome light but that comes on and off still but not to worried about it right now. but i would like to see my fuel at night
 

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my guess is there is a missing or poor ground in the lighting system, and its trying to pull ground through the fuel gauge, or somewhere along the wiring to the rear the fuel sender wire has rubbed through to a wire to the rear lights-you could start by unplugging the harness to the rear(under the dash) which will also unplug the fuel sender, then jump the sender wire so it is hooked up but not the lights, and turn on the lights and see if the trouble is still there-if its gone, trouble in rear harness-if the troubles still there, disc the front harness to the headlights, see what happens-keep narrowing it down
 
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