LED Bedlight Wiring

Tellsch

Member
Messages
19
Reaction score
23
Points
3
Hey Guys,
I recently installed aftermarket bed lights and they work great. I wired constant power to a switch and then to the positive of the lights. Everything is good and works as expected. After using it for a few weeks, I realized it would be really nice if the LEDs came on automatically when the tailgate opens. I dont want to mess with a tilt or pin switch on the tailgate.

I have two wiring questions:

1. Can I wire the white wire/tan tracer directly to the side of the switch that connects to positive of LEDs? That way when the white wire/tan tracer is live (cargo light), the lights will go on. If that wire is off, I can still turn the switch on to turn the lights on. I would think normal opoeation it would be ok. But what if the OEM cargo light was on and I accidentally turned on the bed light switch as well? Would that mess with the white/tan wire at all (will it turn the cargo light indicator on in the dash? will it mess with the cargo light switch in the cab? etc).

2. The safer option, but a bit more work, I believe I can introduce a 5 pin SPDT relay setup like below:
Pin 85 - Ground
Pin 30 - Constant 12V
Pin 86 - White Wire/Tan Tracer (trigger)
Pin 87a - Hot when no trigger is present - this would go to the switch which would then be connected to the positive of LEDs. This would allow the switch to work with the cargo light off.
Pin 87 - Hot when trigger is present - this would go to the positive of the LEDs. This would allow the bed lights to go on when the tailgate opens/cargo light on.

I have only used SPST relays before - can someone check that I have that setup properly? I attached a drawing as it is hard to follow by just describing.

Thanks,
Brian
 

Attachments

Damion

Active Member
Messages
172
Reaction score
100
Points
43
Personally, I would tap into the bed light wire for a trigger and diode isolate that wire from your constant wire. Search for my thread " cheaper alternative to OEM bed lights " I say which wire in the rear drivers side threshold is the rear cargo light wire. They will come on whenever the tailgate is open.
 

Tellsch

Member
Messages
19
Reaction score
23
Points
3
I thought about doing the diode method as well. I ultimately decided against it because I have all the wiring already bundled up in the taillight housing. Using a relay, I don't have to worry about overloading the white/tan wire (which will be the trigger) as all of the power will be coming from the constant 12v.

If I had to do it all over again, I probably would have just run it direct off of white/tan and been done with it. It will be nice having the switch, but TBD on how often I will actually use it. I will say, only having the switch is not ideal. It will be really nice when the lights go on automatically when you open the tailgate.
 

Tellsch

Member
Messages
19
Reaction score
23
Points
3
To anyone following, using the diagram I made with the SPDT relay worked perfectly. I can turn on the lights whenever I want via the switch in the bed or they come on automatically anytime the cargo light goes on (unlock, tailgate open, etc). The nice thing is after the 1.5 minute timer the cargo light is on, I can turn the switch on to have the lights come on for longer. The OEM cargo light switch in the dash also works perfectly.

Tapping the white/tan in the cab and running the wire to the taillight was the biggest pain, but not terrible. Just time consuming.

Finally can put this project to bed!
 

Atlantic Blue

Active Member
Messages
53
Reaction score
16
Points
8
To anyone following, using the diagram I made with the SPDT relay worked perfectly. I can turn on the lights whenever I want via the switch in the bed or they come on automatically anytime the cargo light goes on (unlock, tailgate open, etc). The nice thing is after the 1.5 minute timer the cargo light is on, I can turn the switch on to have the lights come on for longer. The OEM cargo light switch in the dash also works perfectly.

Tapping the white/tan in the cab and running the wire to the taillight was the biggest pain, but not terrible. Just time consuming.

Finally can put this project to bed!
Pictures? Video?
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top