Front grill parking lights go out when headlights are turned on

68 Coronet RT said

After looking at the diagram does the jumper go on the light switch itself or is there a junction box I can go to and put a jumper on.

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I know of no other place the two points are in proximity. The tail lamps go down to the left kick panel connector, the parking laps head out the bulkhead connector into the engine bay

The other thing you might consider.......on my 67 the parking lamp housings are pretty small. If you are not using LEDs the extra heat might damage them