DRL what controls it

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

choquette

Senior Member
Joined
Mar 23, 2012
Posts
107
Reaction score
10
Ram Year
2016
Engine
CUMmins 6.7
How does the computer knows if its day or night? Is there a light captor? If yes is there a way I can tap onto it to get 12v after the captor? If yes is there a way to have a wire diagram? Thanks
 

dudeman2009

Senior Member
Joined
Feb 9, 2016
Posts
1,562
Reaction score
208
Location
Arizona
Ram Year
2001 1500 Sport with enough electrical modifications to make my brain hurt
Engine
Magnum 360
The DRL does not sense light as an automatic headlight system would, it only ensures the headlights are on at dimmed intensity when the ignition is on and the vehicle is moving above aprox. 3mph.

There is no location that I can find in the wiring diagram that will give a perfect 12v signal, it will be close, but not perfect.

Since our lights are positive ground, you will need to invert either the low beam, high beam, or both (depending on if you want your circuit to be activated with only one or the other or both high and low beams) wires on your headlamps.

To do this, you need to take a relay and connect pin 86 to fused battery positive, and pin 85 to either the high beam wire or low beam wire NOT BOTH. (unless you use two diodes 'pointing' towards the headlamp wires, not the relay. Make sure they can handle 12v at about 6W) Then connect terminal 30 to battery positive. Terminal 87 will only power on 12V if the selected beam (high or low, or both if diodes are used) is on.

If you don't want to use diodes, but want the circuit to be powered with both low and high beams, you will need two relays, one with terminal 85 connected to the low beam wire, and the other connected to the high beam wire. Terminal 86 for both relays can be attached to the same fused location. Terminal 30 on both relays can be connected to the same fuse. Terminal 87 on both relays need to be spliced together then sent to your circuit.

Here is a download link to the relevant section of the wiring diagrams

https://1drv.ms/b/s!AivLG2b81LJSi5MyhrouokMMFYejZQ
 
  • Like
Reactions: 9th

dudeman2009

Senior Member
Joined
Feb 9, 2016
Posts
1,562
Reaction score
208
Location
Arizona
Ram Year
2001 1500 Sport with enough electrical modifications to make my brain hurt
Engine
Magnum 360

9th

Senior Member
Joined
Nov 8, 2015
Posts
369
Reaction score
212
Location
Tallahassee, Florida
Ram Year
2012
Engine
Hemi 5.7
He isn't very smart coming to the 2nd gen board asking for help on his late model 3rd gen.

I have no clue if the 3rd gens use positive ground headlights or if there is an easier way to get a signal for the DRL system.
I already answered him to that thread but I deleted when I read your reply..
 
Top