Hi Beam Circuit tie-in

[1500ram12]

Hellooo? Come on folks. I need some help here. I usually get more ideas here than zero. Someone on this forum has to know the answers, please. Thanks. (yes, I’m groveling)

What style headlights do you have


2018 Ram 2500 6.4L Hemi Tradesman

 

[SeaSickSailor]

What style headlights do you have


2018 Ram 2500 6.4L Hemi Tradesman

I believe that they are projection type. Not sure.

 

[1500ram12]

View attachment 196122 View attachment 196121 View attachment 196122 View attachment 196122 View attachment 196121
I believe that they are projection type. Not sure. View attachment 196121

Here are both standard and premium connectors just incase.




2018 Ram 2500 6.4L Hemi Tradesman

 

[superjoe83]

The high beam itself is controlled through a relay because of the current involved. Adding a secondary relay coil in parallel to the high beam bulb will in no way affect the circuit behind the primary relay. The collapsing field of the secondary relay cannot make it back through the primary relay's contacts because that contact has already been broken.

The high beam power is not supplied by a relay in these trucks, the BCM directly powers the circuit

 

[lpennock]

I, also, am trying to find a high-beam trigger signal for a 2019 Power Wagon. I’m using it for a Switch-Pros 9100 system that doesn’t use relays: it’s all digital. There shouldn’t be an inductive kick from this, I think. 1.) any thoughts on digital switching v. relay coils?, and 2.) I can’t find where to tap into the high-beam circuit for the trigger signal. Any ideas on either of these? Thanks.

Easy way is using a posi-tap on the headlight lead.

Another option my 18 had was a set of blunt cut wires behind the driver headlight. One of the wires is the high beam.

Sent from my SM-T350 using Tapatalk

 

[SeaSickSailor]

Easy way is using a posi-tap on the headlight lead.

Another option my 18 had was a set of blunt cut wires behind the driver headlight. One of the wires is the high beam.

Sent from my SM-T350 using Tapatalk

That’s the problem. I can’t find a headlight lead. The one bulb connector that I did find has many wires, and it may not even be the high beam. I’ll have to check it out.

 

[Evguy1]

Do they not use the high beams (at a reduced voltage) as the day time running lights?
I had this problem with my Jeep and added a voltage sensitive relay so it only triggered when the actual high beams were on and not the DTRL's.

 

[SeaSickSailor]

Do they not use the high beams (at a reduced voltage) as the day time running lights?
I had this problem with my Jeep and added a voltage sensitive relay so it only triggered when the actual high beams were on and not the DTRL's.

That’s novel. I didn’t realize that they did that. More research needed, obviously. Thanks.

 

[Evguy1]

Could just be a Canadian thing, eh.

 

[SeaSickSailor]

Could just be a Canadian thing, eh.

Could be. In fact I don’t think I have my DRLs activated. I think that the lights that are always on are considered “accent” lights, and they are definitely not either the low or high beam bulbs. So I think I’ll be pretty safe tapping my high beam signal. Thanks, eh.

 

[1500ram12]

Could be. In fact I don’t think I have my DRLs activated. I think that the lights that are always on are considered “accent” lights, and they are definitely not either the low or high beam bulbs. So I think I’ll be pretty safe tapping my high beam signal. Thanks, eh.

Your drl lights should be the upper and lower strips on the headlights. You are fine using the high beam to tap into


2018 Ram 2500 6.4L Hemi Tradesman

 

[mtnrider]

Disclaimer: While this worked for me and should be fine for any 4th gen proceed at your own risk.

Ok, so I decided to look into this some more and see if I could come up with a solution. This is what I have tested and works. This is on a 2016 Ram 2500 but I imagine 2014-2018 are probably all the same?

Side note: If you are using your high beams for DRL's you are going to want to disable them or switch them over to the low or fog beams (can be done with AlfaOBD). I had my high beams as DRL's but simple changed it to the low beams.

Goal was to tie my light bar into the high beams and also have a separate switch to turn it on with protection (I actually have multiple lights hooked up to separate switches and high beam but going to show just 1 here for simplicity).

I found the high beam wire coming out of the BCM inside the cab. There is a left and right HB wire but the right was easier to get to. The wire is hard to get to but can be done.

The wire you are looking for is the WT/GY (white/gray) wire coming out of the C1 connector pin "2" on the BCM.





Here you can see where I spliced in to the WT/GY wire coming out of pin 2. It's a 18awg gauge wire. I stripped back the insulation and soldered it but you might be able to use one of those crimp splices but there isn't much room in there to get a pair of pliers in there to crimp it. Like I said it's hard to reach but can be done.



Here is a diagram of how I hooked it up. If using just the high beam switch just ignore the switch I have shown. Like I said, I have multiple lights and switches so if someone is interested in that I can make another diagram showing that.

 

[mtnrider]

Here I added an additional switch to the diagram for those that may want to disable the High Beam switch from turning on the light bar.... I might add this myself.

 

[SeaSickSailor]

Thanks mtnrider. Have to see if 2018 is the same as 2019. Should be close. Where do you find all this great info?

 

[mtnrider]

Thanks mtnrider. Have to see if 2018 is the same as 2019. Should be close. Where do you find all this great info?

2018 should be the same. I have a diagram that is supposed to be for the 2018 and it is the same as my 2016 for the headlight circuit.
Most of the diagrams I have just collected over the years from various posts etc.

.

 

[1500ram12]

Thanks mtnrider. Have to see if 2018 is the same as 2019. Should be close. Where do you find all this great info?

All connector views can be found here

http://connectors.dcctools.com/results.htm

Anything detailed beyond that requires a subscription to alldatadiy.com, runs about $20 for a year

Here's the 2019 2500 c1




2018 Ram 2500 6.4L Hemi Tradesman

 

[SeaSickSailor]

This is all great. Now if I can find the Central Body Controller (CBC vs BCM in 2018); in the cab, you say?

 

[SeaSickSailor]

I tried the link provided by 1500ram12 for connectors.dcctools.com/results and I get a Mopar error page.

 

[mtnrider]

This is all great. Now if I can find the Central Body Controller (CBC vs BCM in 2018); in the cab, you say?

BCM on my 2016 is drivers side firewall.

 

[1500ram12]

I tried the link provided by 1500ram12 for connectors.dcctools.com/results and I get a Mopar error page.

http://connectors.dcctools.com/home.htm


2018 Ram 2500 6.4L Hemi Tradesman