2005 Dodge Ram Headlights
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=67105
Printed Date: April 29, 2024 at 10:48 AM
Topic: 2005 Dodge Ram Headlights
Posted By: westminsterfjr
Subject: 2005 Dodge Ram Headlights
Date Posted: November 27, 2005 at 10:32 AM
Folks:
What resistor value is required to activate the headlights on a 2005 Dodge Ram?
There seems to be a difference between 2004 and 2005.
Wire color = WHITE/ lt. GREEN (-) @ HEADLIGHT SWITCH
For 2004:
Parking light = use 330 Ohm to ground
Head lights = use 700 Ohm to ground
For 2005:
Parking light = use 590 Ohm to ground
Head lights = use ??? Ohm to ground
Thanks,
-Ken
Replies:
Posted By: mo12v
Date Posted: November 27, 2005 at 11:40 AM
| Parking Lamp | WHITE/ GREY (+) | HARNESS LEFT OF COLUMN ** |
** Also Found As WHITE/ LT GREEN (-) At Headlight Switch. Must See Chassis Ground Through 250 Ohm Resistor.
| Headlights | WHITE/ LT GREEN | AT HEADLIGHT SWITCH * |
* WHITE/ LT GREEN Must See Chassis Ground Through A 1.4K Ohm Resistor To Turn On Headlights & Parking Lights
------------- MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: westminsterfjr
Date Posted: November 27, 2005 at 11:46 AM
MO:
Is that saying 1.4k ohm will turn on both the headlights AND parking lights?
Thanks,
-Ken
Posted By: mo12v
Date Posted: November 27, 2005 at 11:49 AM
YEPPER...........
can be within 10%
-------------
MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: westminsterfjr
Date Posted: November 27, 2005 at 7:47 PM
Thanks, MO.
Would I need a relay for triggering the headlights? The output from the remote starter is 200mA(-). Also, would 1/4 watt resistors be sufficient?
Thanks,
-Ken
Posted By: mo12v
Date Posted: November 27, 2005 at 7:55 PM
Sometimes............Try it first
I usually put Relays on the units I use, because most manufacturers recommend it
-------------
MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: tragik
Date Posted: November 27, 2005 at 7:58 PM
you do need a relay. to make this happen without causing problems you have to seperate the wire with a relay, and isolate it from the switch.
-------------
Northstart.....or start it your damn self.
Posted By: westminsterfjr
Date Posted: November 27, 2005 at 8:37 PM
I'm a little confused.
According to Bulldog's diagram, it says the resistor wattage rating is not important.
So that's implying that a small 1/4 watt resistor is sufficient.
I = (P/R)^(0.5)
= (0.25 watts/590 ohms)^(0.5) = 20.58 mA
This is saying that the current will not exceed 20.58 mA. If my output wire is 200mA, then why would I need a relay as the diagram specifies?
2005 Dodge Ram Light Wiring Diagram
Thanks,
-Ken
Posted By: westminsterfjr
Date Posted: November 27, 2005 at 9:43 PM
I agree that I can't go wrong by using a relay.
My assumption is these multiplexed wires serve as low current triggers to the BCM (body control module). The BCM then takes the resistive signal and does the actual controlling of lights (in this case).
-Ken
Posted By: b-roy
Date Posted: November 27, 2005 at 10:07 PM
Did one of these not too far back. I tried using the output straight out for experimental purposes, didn't work right from the get go. Relayed it and was off to the races.
Posted By: JWorm
Date Posted: November 27, 2005 at 11:51 PM
As mo12v said...
Parking Lamp WHITE/ GREY (+) HARNESS LEFT OF COLUMN **
I always use that wire too. It turns on the outside parking lights, but not the dash lights. You can get the WHITE/ tan brake wire in the same harness.
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