Turn signal issue

[Polsky]

Hello everyone. I have a 1967 Dodge Coronet RT. The passenger side turn signal works normal when I do not have the headlights on. When I turn on the headlights , The turn signal blinks very weak. It is almost unnoticeable. When I take the driver side turn signal bulb assembly out while it is turned on it is blinking very brightly from the top element. When I turn on the right turn signal and remove the bulb assembly it is constantly lit on the top element but not very bright. When I ground the right assembly to the bumper both elements are bright on the passenger side but not blinking. Wondering if somebody could point me in the right direction on where to start to work. Thanks and advance!

 

[oldbee]

Check every ground in the front end! Sounds like a bad ground somewhere.

 

[Yatzee]

Hello everyone. I have a 1967 Dodge Coronet RT. The passenger side turn signal works normal when I do not have the headlights on. When I turn on the headlights , The turn signal blinks very weak. It is almost unnoticeable. When I take the driver side turn signal bulb assembly out while it is turned on it is blinking very brightly from the top element. When I turn on the right turn signal and remove the bulb assembly it is constantly lit on the top element but not very bright. When I ground the right assembly to the bumper both elements are bright on the passenger side but not blinking. Wondering if somebody could point me in the right direction on where to start to work. Thanks and advance!

Your front bulbs are dual element and two separate circuits, one for parking lights and one circuit for turn illumination. It would appear as if a bulb, socket or connector for one circuit is acting as ground for the other circuit. Inspect the sockets very closely and the attachment points for the housing or ground.Sounds like the previous owner did a bit of rewiring so best you download an electrical diagram and trace the wires by color code to their respective points of connection. I heard of a similar situation once before where the wires were connected wrong for their respective bulb elements. You should notice that one element in the bulb is actually brighter than the other.

 

[Shorthorse]

Old style original mechanical blinkers relied on the current of the bulbs to flash/operate. You could always tell you had a burnt out bulb because because the turn signal wouldn't flash on that side. The reason I mention that is if you have an old style blinker, removing the bulb/load can cause the lights to stop flashing. This can result in a false assumption.
I'm with "oldbee". Check all your grounds first.
When you're dealing with DC current and the problem doesn't make sense or seems to float around, it's a ground problem.