Disclaimer: This installation article is a tutorial guide. By reading this article, you agree it is for reference only and AlphaRex USA and its distributors make no guarantee on the finished results. Under no circumstances whatsoever shall AlphaRex USA nor its distributors be liable for any damage, misuse or personal injuries. If you do not fully understand the installation procedure, it is highly recommended that you seek help from professional mechanics to do the installation.

Some vehicle require the DRL harness installed for the headlight to function properly. Here’s a list of certain model with require the DRL to be install.

1) 07-13 Tundra ( all model )
2) 05-11 Tacoma ( all model )
3) 12-15 Tacoma ( all model )
4) 16-21 Tacoma ( SR5 model )
5) 10-13 4 Runner ( all model )


Wiring the DRL harness

One of the key features of our headlights is to have the ability to run the DRL strips in the day without having to activate any of your lighting controls manually. The way to do this is by wiring the harness that is included with your headlights.

Depending on the headlights feature you get, there will be two types of DRL harness. One that comes with a yellow wire and one that’s without the yellow wire. If your DRL harness did not comes with any yellow wire , just leave the connection on the headlight unplug . For DRL harness that comes with a yellow wire , connect that to the nearest headlight, you will only need to connect to one headlight and leave the yellow connector on the other headlight unplug.

Wiring diagram for DRL harness without Activation light and sequential signal
Wiring diagram for DRL harness with Activation light and sequential signal


The function of the DRL harness is to allow the DRL with different intensity during daytime and night time. Basically, the DRL harness will supply extra power to the DRL for brighter output during daytime, and when the parking light is on, the DRL will be at reduced intensity. With the optional harness installed, the headlights will function as follows with most vehicles:

Ignition/Engine ON– DRL at High intensity
Parking Light ON– DRL at reduced intensity
– amber side marker
Low Beam ON– DRL at reduced Intensity
– Amber side marker
– Low beam on
High Beam ON– DRL at reduced Intensity
– Amber side marker
– Low beam on
– High beam on
Automatic Function– Will function as normal




Tapping the grey wire to ignition


With the grey wire, you will need to tap it into a switched fuse under the hood. We recommend that you use a fuse tap similar to the picture below.


Suggest fuse locations

2009-2014 Ford F150 – #76
2015-2017 Ford F150 – #97
2018-2019 Ford F150 – #10 #36
2017-2019 Ford Super Duty – #35
2016-2020 Ford Ranger – #24
2009-2019 Ram – #F66 #M6 #M19

2015-2019 Chevrolet Silverado 2500HD/3500HD – #39
2007-2013 Toyota Tundra IGN fuse
2014-2020 Toyota Tundra IGN fuse
2014-2020 Toyota 4Runner INJ fuse