1. I am not responsible for anything that happens to your truck or you. If you don't understand electronics, then this isnt for you. By reading this thread you assume all liability (my lawyer made me do this)
2. This write up sucks, I know...but I will help you if you have questions. I have been doing this stuff since I was really young, so I take a lot of stuff for granted and skip the small steps, ask if you have questions.
Background of Why I did this mod:
So I was bored this morning while my girlfriend was at work so I decided to get some stuff done on the truck. Since I had just stumbled across the most awesome electronics store and bought a ton of components (relays, diodes, etc), I decided that I needed to do something with these.
I always wanted brighter reverse lights and also some bed lights/off road tail lighting and wanted to integrate them together.
What this mod Does:
This mod will provide you with bed lights that can be turned on with an in-dash (or wherever yo u want to mount it) switch or will automatically turn on when shifted into reverse.
I started out by mounting these lights to the bed rails. I utilized some L brackets connected to the bed rails with washers and bolts and screws, this is pretty self explanatory and will change depending on what lights/brackets you choose.
Closer shot of the passenger side light:
The lights are connected in series, so the power and ground come from the drivers side light to the passenger side light, this doesnt really matter, but this is how I did it.
Wiring layout and routing is pretty much up to you.
I ran 12v directly from the battery with a fused link to the lights.
I tapped the towing harness for the reverse signal as seen below. This can be done multiple ways (reverse lights, inside the cabin, etc). Just depends where you want to pull your reverse signal from. This signal will power the relay causing it to switch pins and illuminate the lights when you shift into reverse.
The ground wires from the lights and the reverse signal wire were run through the grommet on the drivers side. It comes up right below the front of the drivers seat.
Then its time to wire the relay. I wired it as shown in this drawing below. Sorry that it sucks, it was drawn on a laptop. LOL
Whats going on with this relay stuff?
Whats happening here is this:
SPDT (Single Pole - Double Throw) relays sit with 87a normally closed. This means that pins 30 and 87a are connected in the relays resting state. When a relay receives power across its coil (85-85) it will switch from 87a to 87. This is why when the reverse signal is detected, the relay flips to 87, and turns on the lights, completely bypassing the switch.
I installed the relay here:
And ran the wires up to the switch:
Thats pretty much it, i just installed the switch and tested them out.
result pictures (way brighter in person, keep in mind these are driving lights)
Thanks for reading, let me know if you have some questions.