Topic Sponsor
Off-Road Section All discussion and questions about off-road in this Section
Sponsored by:
Sponsored by:

Wiring LED lights question

 
Old 02-02-2019, 08:48 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Mar 2013
Posts: 225
Received 37 Likes on 26 Posts
Default Wiring LED lights question

Hi I have a question I was hoping someone will have an answer for. I recently bought a 20 inch LED to go in the open space behind my license plate holder on my 5.0. It came with a wiring harness and the light works just fine. I hooked it directly to my battery and ran the switch through the fire wall.

My question is: How can I wire it so that it only comes on when the truck is running? The truck is not a daily driver and I feel like the small light on the switch will gradually wear down my battery. I get a little warning about my battery before I turn on my truck.

My battery has multiple points where I can contact the LED wiring kit. Are some of these points only hot when the key is on?

Thanks
BACK2GAS is offline  
Old 02-02-2019, 10:45 PM
  #2  
Senior Member
 
Join Date: Feb 2016
Posts: 266
Received 49 Likes on 38 Posts
Default

Originally Posted by BACK2GAS View Post
Hi I have a question I was hoping someone will have an answer for. I recently bought a 20 inch LED to go in the open space behind my license plate holder on my 5.0. It came with a wiring harness and the light works just fine. I hooked it directly to my battery and ran the switch through the fire wall.

My question is: How can I wire it so that it only comes on when the truck is running? The truck is not a daily driver and I feel like the small light on the switch will gradually wear down my battery. I get a little warning about my battery before I turn on my truck.

My battery has multiple points where I can contact the LED wiring kit. Are some of these points only hot when the key is on?

Thanks
i have a 52 and a 40 inch radius bars wired in the same way you do. The draw from the "switch" is so insignificant that it will not affect your battery.
Jack Anthony Rook is offline  
Old 02-03-2019, 09:15 AM
  #3  
Senior Member
 
Join Date: Apr 2017
Location: Arizona
Posts: 1,913
Received 351 Likes on 312 Posts
Default

You could wire in a relay that only allows power when key is turned to on position.
jdunk54nl is offline  
Old 02-03-2019, 03:42 PM
  #4  
Trying to figure it out!
 
Scott91370's Avatar
 
Join Date: Jan 2016
Location: Burleson, Texas
Posts: 1,574
Received 227 Likes on 197 Posts
Default

Don't hook it straight to the battery would be option 1.
After that it will depend on how the harness is designed as to how it hooks up.
There should be a wire form an ignition switched fuse to the light switch (this will only allow it work work when the key is on).
From the light switch it should go to a relay (which is hooked to your battery.
Relay wil be hooked to the light itself.
Scott91370 is offline  
Old 02-03-2019, 05:04 PM
  #5  
Senior Member
Thread Starter
 
Join Date: Mar 2013
Posts: 225
Received 37 Likes on 26 Posts
Default

Thanks for all the answers.

Originally when I hooked it up I also didn't think the draw from the light switch would be an issue. It could be that my battery being 6 years old was just on it's last leg and the switch was enough to push it over the edge. It's not a daily driver so it can sit there not started for 3 weeks.

For now I removed the inline fuse which took care of the draw. I also replaced the original battery just today. Replaced it with another Motorcraft battery. Very happy with the performance of the original battery.

The wiring harness that came with light has a relay on it. I just don't know much about wiring.
BACK2GAS is offline  
Old 02-04-2019, 07:53 AM
  #6  
Senior Member
 
Join Date: Dec 2013
Location: NC
Posts: 1,262
Received 163 Likes on 141 Posts
Default

Run the power wire to the switch from an ignition switched circuit in the fuse box in side the cab. This will cause your light bar to only work when the ignition is on. Or if there is a separate wire for the illumination, just run that wire from either ignition switched or dash light circuit. This will let your bar turn on anytime the switch is on, but the light on the switch won't always be on.

Or just disconnect the ground wire from the switch and the light on the switch won't come on, but your light bar will work whenever you flip the switch.
jp360cj is offline  
Old 02-04-2019, 09:19 AM
  #7  
Senior Member
 
Join Date: Apr 2017
Location: Arizona
Posts: 1,913
Received 351 Likes on 312 Posts
Default

Does the switch stay illuminated when you turn it on AND when it is off? If not, you might just be able to reverse the wires.
How many wires come out of the switch? You might just need to re-wire it to make it work.

Otherwise here are some options
1) Replace switch with one that does not light up
2) Replace switch with one that only lights up when it is on
3) wire in a relay for the switch.

These switches are some of the best. They have multiple wiring options to illuminate or not illuminate.
https://www.otrattw.net/

jdunk54nl is offline  
 


Thread Tools
Search this Thread
Quick Reply: Wiring LED lights question


Contact Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: