Friend is working on a 69 Dart and when he hits the brake pedal the parking lights come on up front. This sounds like some sort of a grounding issue to my pea brain. But where is a good place for him to start the search?

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Turn signal switch is where these circuits come together.

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Joshua

When I put the 83 D150 back together after having it apart down to the frame rails, I had that exact same issue. Step on the brake pedal and the front parking lights would light.
I have slept since then, but it was something in the rear wiring harness I had two plug in connectors swapped and plugged in wrong.

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Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8

It could also be a messed up rear tail lamp bulb (Brake/signal). I have seen the filaments short between the dim (park) and bright (signal) ans cause weird issues like that.

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-MattMan
LEANED & MEAN

Thanks guys, I'll pass those things along.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

I also had a similar issue on a 66 Fury. When a bulb was put in the brake light socket, it would twist the socket contacts around (broken locator tab). The bulb contacts shorted across the two socket contacts. That was a difficult one to figure out.
jus sayin....

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-MattMan
LEANED & MEAN