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2005 Dodge Ram Headlights


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westminsterfjr 
Member - Posts: 9
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Joined: November 11, 2005
Location: United States
Posted: November 27, 2005 at 10:32 AM / IP Logged  
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
mo12v 
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Posted: November 27, 2005 at 11:40 AM / IP Logged  

Parking LampWHITE/ GREY (+)HARNESS LEFT OF COLUMN **

** Also Found As WHITE/ LT GREEN (-) At Headlight Switch. Must See Chassis Ground Through 250 Ohm Resistor.
HeadlightsWHITE/ LT GREENAT 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.
westminsterfjr 
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Joined: November 11, 2005
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Posted: November 27, 2005 at 11:46 AM / IP Logged  
MO:
Is that saying 1.4k ohm will turn on both the headlights AND parking lights?
Thanks,
-Ken
mo12v 
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Posted: November 27, 2005 at 11:49 AM / IP Logged  
YEPPER...........
can be within 10%
MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
westminsterfjr 
Member - Posts: 9
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Joined: November 11, 2005
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Posted: November 27, 2005 at 7:47 PM / IP Logged  
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
mo12v 
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Posted: November 27, 2005 at 7:55 PM / IP Logged  
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.
tragik 
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Joined: September 28, 2005
Location: Alaska, United States
Posted: November 27, 2005 at 7:58 PM / IP Logged  
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.
westminsterfjr 
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Posted: November 27, 2005 at 8:37 PM / IP Logged  
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
westminsterfjr 
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Posted: November 27, 2005 at 9:43 PM / IP Logged  
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
b-roy 
Copper - Posts: 56
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Joined: November 21, 2005
Location: Canada
Posted: November 27, 2005 at 10:07 PM / IP Logged  

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.

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