65 brake light problem
 

So I have a 1965 mustang that has a problem where only one brake light will work. If I turn on the turn signal on the side that it's on the other will illuminate. So basically it will flip flop back and forth. If I push on the brakes with the turn signal on it looks okay ( in other words the correct side blinks and the other side illuminates) but as soon as I turn off the turn signal it goes back to only one side working. Taillights work fine as well as the turn signals, it's only the brake lights with problems. Any ideas?

Re: 65 brake light problem
 

Turnsignal switch is bad.

Re: 65 brake light problem
 

Gearhead is exactly right. Replace the turnsignal switch.

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