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Does the door ajar light come on in the cluster when you open a any door?
Is this in the over head console or is it just a single dome light in your truck?
The front maps lights should come on when the door is opened also.
Check fuses #21 and #24 in the dash fuse box.
What wire are you getting power on?The black wire or the green wire at the light?
No problem. I'll be at work at my dealership tomorrow. I'll get an email when you reply and I'll get back to you as soon as I can, depending on how busy the shop is. If not, I'll be back online tomorrow evening when I get off of work.
The green wire is constant power for switched lights. I read that the cargo light comes on when switched and when a door is opened. Is this correct?
Can you post a picture of this dome light in your F150?
The inside dome light and the cargo lights run off the same circuit for the door ajar switch.
The black wire with the light blue stripe should have power when any door is opened. Check and see if you get power on that same wire at the cargo light. You will have to remove the light from the outside the cab. If you get power at the cargo light, then use a digital volt meter and set it to OHMS. Then disconnect the battery and unplug the cargo light and the dome light and check the resistance in the black/light blue striped wire between the two lights. This will check and see if the wire is intact and not broken.