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LED Truck Bed Lights - Multiple Controls

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=143514
Printed Date: May 02, 2025 at 4:37 AM


Topic: LED Truck Bed Lights - Multiple Controls

Posted By: morleyz
Subject: LED Truck Bed Lights - Multiple Controls
Date Posted: August 30, 2017 at 1:55 PM

Hello all. I'm installing some LED strips under the bed rail in my new pickup. I would like to be able to control the lights in the following ways:

1) Install a door pin switch on the tail gate. Open the gate, lights come on
2) Install a cut off switch in the bed in case I need to have the tail gate off or down and want to turn the lights off
3) Turn the lights on using the built in upfitter switches in the cab, regardless of the status of the pin switch/cut off switch. The upfitter switches supply 12V.

I could accomplish 1 & 2 above with no problems. The addition of #3 (essentially a 2nd 12V source) is where I get lost, but I'm very good at following directions, so I hoping someone can explain how to design.

Thanks.



Replies:

Posted By: the12volt
Date Posted: August 30, 2017 at 7:38 PM
If you want everything to switch through the ground wire for the LED's as you described in #1 and #2, you can use an SPDT relay for #3 to provide ground to the LED's.

85 and 30 to ground
87 to LED's negative
87a not used
86 to 12V+ from the switch(es) in the cab.

https://www.the12volt.com/relays/page1.asp

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posted_image the12volt • Support the12volt.com


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