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Alright so my 65 Galaxie has had an issue with the driver side tail light it doesn’t flash with the turn signal nor does the brake light work but it’s running light does and reverse light the bulb is good socket seems fine. When you turn the driver side turn signal on it doesn’t flash just turns on same with the front driver signal light ( is this what cars used to do instead of hyperflash like newer cars) has anyone else had this problem and know of a common solution maybe a ground wire that wasn’t put in a good spot or something or even where it’s wiring harness goes once it disappears into the quarter panel?
 

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brake and t/s are the same filiment, block the brake pedal so brake lights are on. now get your test light and find why there's no power to that light.
 

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Nick,

Find the wiring diagram and trace the circuit from the brake light bulb. There is a sticky post with '65 wiring diagram, color coded to help.

The driver side front doesn't flash because the brake light/turn signal circuit isn't working. Those old flashers needed a certain amount of resistance to work - if either front or rear bulb is out they typically won't flash.

Brake and turn signal wiring is the same all the way back from the brake light bulb to the turn signal switch. Reverse light is a different bulb and different circuit. Running light is same bulb, but separate filament and wiring circuit. It uses an 1157 dual filament bulb. Are you sure the bulb is good? Swap sides to make sure or try a new bulb.

extech is right - there's no quick fix. You just have to methodically search. Start with the bulb. Check the ground. If those are OK, start tracing the wire until you find where it is broken. Look at the connectors first - these will be shown on the wiring diagram to help get an idea where to look. It's possible there is some corrosion at a connection, and this is where breaks often happen.

- John
 
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