aux lights wiring question

[PowerWagon2019]

Looking to add aux lights (light bar) to my 5th gen HD. Wiring is pretty straight forward except for the high beam trigger circuit. (allowing the ability to turn on the light bar only when high beams are on)

I read where others have used the driver side white/green headlamp wire to drive this but I see there are 2 such wires in the drive side headlight plug.

Any suggestions would be appreciated, or maybe there is a better solution someone already found to do this?

Thanks!

 

[Wadejesu]

I wired mine separate from the factory can-bus system with a separate switch, that way I can turn lights on/off whenever. Straight to battery through a fuse so you can turn on without key on.

 

[RandomRam]

Do you have VSIM? Should be a trigger off that module.

 

[PowerWagon2019]

I did not get the VSIM option so I am looking for another trigger circuit option for the high beams.

Thanks!

 

[mtnrider]

Mine is a 2016 so not sure how different the 2019 is but I imagine it is very similar?

I have a aux switch (several actually) that I mounted in the lower dash but I also tied it into the high beams so I can either turn it on independently or in combination with the high beams.

I used the high beam driver coming out of the BCM inside the cab. Tied it in to the light bar relay with the aux switch. I used diodes to protect the BCM from any back current. I also added a switch where I can disable the light bat with high beams if I want.


Here is a 2018 BCM diagram (same as my 2016.



And how I wired it in

 

[Sandevino]

I’ve got the aux switches and vsim and will be tackling this issue this fall. I’m looking to mount lights in the front and rear for better visibility. The rear lights are easy and will be ties into the backup light circuit. The lights up front will be another story... let me know what you decide to do and we can compare notes.