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Aftermarket Running Lights

971 views 4 replies 3 participants last post by  Mike13 
#1 ·
I added LED running/clearance lights to my light bar and would like to have those switched with the stock running lights. Is there any easy way to do this? If not I think that I will just have them tap into a switched circuit so they are only on when the key is in the ignition.

Thanks for your help!
 
#2 ·
You can do it somewhat simply, yes. You will need a relay for the correct voltage that will cover whatever amperage range you'll be using. You can get some standard 5 wire ones at any auto parts store or on amazon, etc... Some even come with a harness/pigtail. You will also need a fuse holder and the correct amperage fuse, which should be placed as close to the power source as possible in case of a failure.

There will be a wire on the relay that is a remote wire. When signal is received, it will take power from a different wire and send it to your device via another different wire. Check with the manufacturer of your relay to find the correct wiring diagram.

Take this for example:

http://www.amazon.com/Relay-Harness-Bosch-Style-40AMP-HRNS/dp/B005HFYE1O/ref=sr_1_1?ie=UTF8&qid=1419667059&sr=8-1&keywords=12v+relay

If you look at the reviews, you can see someone has already labeled the wiring. In this case, the "switch" wire would be where you splice into your existing running lamp. When you power your running lamp, it will also send power to your add-on lights.

Keep your relay in a dry and cool place, and if you're really going to be shoving a lot of current through it, make sure your harness/wiring is of a decent gauge.
 
#3 ·
You can do it somewhat simply, yes. You will need a relay for the correct voltage that will cover whatever amperage range you'll be using. You can get some standard 5 wire ones at any auto parts store or on amazon, etc... Some even come with a harness/pigtail. You will also need a fuse holder and the correct amperage fuse, which should be placed as close to the power source as possible in case of a failure.

There will be a wire on the relay that is a remote wire. When signal is received, it will take power from a different wire and send it to your device via another different wire. Check with the manufacturer of your relay to find the correct wiring diagram.

Take this for example:

Amazon.com: AGT (5 Pack) 30/40 AMP Relay Harness Spdt 12V Bosch Style (40AMP-HRNS): Automotive

If you look at the reviews, you can see someone has already labeled the wiring. In this case, the "switch" wire would be where you splice into your existing running lamp. When you power your running lamp, it will also send power to your add-on lights.

Keep your relay in a dry and cool place, and if you're really going to be shoving a lot of current through it, make sure your harness/wiring is of a decent gauge.

Thanks for you help! I understand how to use a relay as I have had to use many of them for all my other lights. I was more concerned with locating an easy access wire (that could switch the relay) that was connected to the running lights without having to route a wire all the way from one of the lights.
 
#5 ·
There are only five and I believe they only draw three watts each so 15 watts total. That would probably be the easiest method.

Here is a picture. It is hard to make out the LEDs with the other lights on but this was the best pic I had.

Land vehicle Vehicle Car Off-road vehicle Automotive tire
 
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