@$#!@%% lamps out

[TommyD11730]

So it's pretty late here, just got home from work. My daily (1984 K2500) just lost its right front marker lamps. Both the one in the fender and grille are out. Also the right turn indicator stays lit all the time.
All lamps front and rear otherwise function fine, 4-ways, directional's all ok.
The right front marker lamps ground circuit (dark blue wire) is open.
IMO ( at 230am!) I have a bad turn signal switch.

What do you guys think?

 

[YOUNGBLOOD13]

The ground is your problem. Circuit is trying to ground through indicator lamp. Just repair the ground circuit

 

[Fordum]

Yep, the turn signal indicator is the giveaway. Pretty much every time you see that, the front turn signal/parking light bulb has lost its ground. Of course, in your case, its probably more than just that one bulb's ground.
Ford had a ton of front sockets in the late 70s that had bad ground connections where the wire was crimped. I finally found it on my old Torino, and had to replace both front sockets.
After that, I fixed or told folks how to fix the problem with faintly glowing turn signal indicators dozens of times on all models of cars and trucks.

 

[Russell]

Usually the faulty ground is either behind the instrument panel to the left on the firewall inside the cab or at the base of the rad support on either side.

 

[TommyD11730]

You brought back fond memories of my 71 GT. That was an awesome car!

Had a look at the lights when I wasn't stoned on chassis paint fumes... 1 socket later I'm back in business!

Thanks guys!