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Yesterday I picked up a 1969 F-100, when I turn on the running lights everything works as supposed to but when I turn on the headlights, the front turn signals shut off. All the other running lights work like they should, I’m new to this bodystyle so I wasn’t sure if it’s supposed to do that or if something is wrong with it.
That is normal on the 69. You can add a jumper to allow both to light, can't remember off the top of my head which it is. I will look right now for the diagram
Yep. I think cars got the change in something like '68 or '69, while trucks and utility vehicles were not required to have both working until about later '69 or '70. In your case it looks like it was '70.
Not sure if simply changing the switch to a more modern one also does the trick, or if you need to change a wire in the harness, but with GM vehicles as far back as '65 we were able to simply swap one wire into a blank position in the connector where it lined up with an unused tab on the switch. Voila! All lights lit.
The jumper trick seems pretty straightforward and worth doing because even if you can "fix" it with a new switch, the new parts are such crap you might not get a new switch that works very well compared to an old one.
So keep all old parts when changing things. Just in case the old tired one turns out to still be better than the new defective one.
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