WHERE CAN I FIND A WIRING DIAGRAM?

Lemme get this straight... your taillights, brake lights, rear turn signals and emergency flashers dont work, right?

And you have changed the bulbs?

I dont think you need a wiring diagram. You almost certainly have a bad ground in that harness and you have to physically trace that anyway.

First make sure the bed is grounded to the frame

I had my rear lights fail on a '95 Taurus. I changed a blown fuse myself, but that didn't fix the problem. So I took it into the shop and got a new headlight switch and part of wiring harness replaced (melted) This fixed problems for $246.00

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Vehicle repair guides, chassis electrical lighting. Scroll down to fig.

2. Hopefully the correct page will show up when you click the shortened link below.