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dodge ram off road lights

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=138702
Printed Date: January 22, 2022 at 5:57 AM


Topic: dodge ram off road lights

Posted By: michaelmrc
Subject: dodge ram off road lights
Date Posted: March 22, 2015 at 6:47 PM

good day everyone i have a 2014 dodge ram 2500 im wanting to put some off road lights on and have them activated by the high beam switch via a relay. a friend of mine told me that the highbeam and daytime running lights on this vehicle are the same circuit and therefore a relay off the highbeam switch would not work. can anyone confirm this and if so what is the recommended method to accomplish this. thanks



Replies:

Posted By: howie ll
Date Posted: March 22, 2015 at 7:03 PM
Very unlikely depending on local regs. Here in the UK the DLRs shutdown on activating side and headlamps.
Trigger your relay from the wire that goes to POS 12V+ when you turn on your high beams.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.




Posted By: michaelmrc
Date Posted: March 22, 2015 at 7:05 PM
what i dont want is the offroad lights turning on when the daytime running lights come on just when i activate the high beams.




Posted By: howie ll
Date Posted: March 22, 2015 at 7:17 PM
Are your DLRs on with the high beams then?

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.




Posted By: michaelmrc
Date Posted: March 22, 2015 at 7:20 PM
the drls are on the high beam circuit. my buddy said they work off of pwm when on drl but full 12 volts when on high. he said the relay wouldnt latch due to the pwm and would only buzz. i havent tried this yet just thought id see if anyone has any info.




Posted By: howie ll
Date Posted: March 22, 2015 at 7:22 PM
At the headlight switch with a 5amp diode block after the join so no feedback?

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.




Posted By: michaelmrc
Date Posted: March 22, 2015 at 7:41 PM
so if i understand your saying from the high beam wire place a diode towards the relay pin 86, 85 to ground, 87 to +12v and 30 to offroad lights. is this correct?




Posted By: Ween
Date Posted: March 22, 2015 at 8:39 PM
Does your Ram have the base or premium (HID) lighting?




Posted By: michaelmrc
Date Posted: March 22, 2015 at 8:43 PM
its the base lighting not hid




Posted By: howie ll
Date Posted: March 23, 2015 at 3:39 AM
I haven't thought this through because it was late night my time.
I have some more questions for you.
Do North American vehicles now have headlight flashers, on the indicator stalk on the steering column?
If so you have a high beam control wire in the steering column loom..
This wire could do one of four things.
1) POS switching.
2) NEG switching
3) Multiplex, i.e. resistive
4) Data.
You will have to test and or refer to the wiring diagram.
If 1 or 2 easy 1, trigger the relay and after your join, diode goes band away from join.
If 2 same set-up but diode band towards join.
If 3 if that voltage is 7 volts or above a standard relay will still work. If 5 volts or below you will need a specialist relay, Farnell etc., 5 or relevant voltage coil.
If 4, I haven't a clue.


-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.




Posted By: howie ll
Date Posted: March 23, 2015 at 3:41 AM
How important is the fact that the DLRs are on anyway?
If you're going off road whether or not they are on doesn't matter.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.




Posted By: Ween
Date Posted: March 23, 2015 at 5:15 AM
The headlight switch is multiplex data, not sure on the high/low dimmer. Haven't found on schematics yet.
DRL's are mandatory in Canada if I recall. Need to determine if when switched to high beam if the PWM is still present. If not, then a circuit to detect the presence (or absense) of the PWM is needed. Otherwise, the circuit would have to sense the change in duty cycle.




Posted By: michaelmrc
Date Posted: March 23, 2015 at 9:04 AM
Dr's need to function as the truck will truck will be driven on road as well as off road. From what I can tell pwm is present during drl portion only seems to be straight 12v when switched to high beam.




Posted By: michaelmrc
Date Posted: March 24, 2015 at 4:49 PM
OK figured out a way to make this happen thought thought I would share.
Can't tap Into high beam wire due to the pwm issue so came up with this circuit. Tap to the low beam circuit bring it to pin 8th a relay pin 86 to ground pin 8th 12th power and pin 30 to pin 87 of 2nd relay. Pin 85 of 2nd relay comes from a tap into the marker light pin 86 to ground and pin 30 to driving lights. This way if low beams are on no current flows and if the marker lights are not on then must be on drl so no current flows. 1 extra relay but works great.





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