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Well I've had a weird electrical problem creep up in my 65' FB yesterday. I replaced the rear wiring harness the other day, the old one was all dry rotted and a mess. Well the good news is the fuel guage reads a full tank now and doesn;t go up to full and then drop to 3/4 anymore with the fresh new wire. The odd thing is that when I turn on the left hand blinker the aftermarket radio will flash. Then I realized that the rear right blinker was blinking really dimly too...I traced it to what I think is poor connections on the rear light sockets now that I have new wires. If I move them around I can make boht sides flash with only the left blinker on. This also causes the dimmer switch to dim the lights if you turn it with out it being pulled out for parking or headlights...some how its shorting the two hot leads together in the tail light and making interesting things happen....like stepping on the brake pedal and watching the radio flash....Kind of a weird one....going to buy a couple new rear light fixtures that are clean and solid.....and ill see what happens. Kory

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Check all the grounds in the trunk ... one of the ground wires is not making good contact with a ground.

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I had a similar thing happen to me. When I pushed on the brakes the
dash lights would come on. Turned out to be the two wires on the left
rear light had worn through and were touching. My lawn chairs had bumped
up against them and caused a short. I separated the wires taped them off
and no more problem. You could check to see if your brake light wire and the
headlight (tail light) wire are touching. When you put on the brake it can be
sending power up the tail light wire to the dash. Good Luck!

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I TOO HAD A PROBLEM LIKE THIS AND IT TURNED OUT TO BE A GROUND CABLE FROM THE BATTERY TO THE CHASSIE. I FOUND IT BY USING JUMPER CABLES TO MAKE THE CONNECTIONS. GROUNDS ARE USUALLY THE PROBLEM 9 OUT OF 10 TIMES. DENVER
 
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