2003 Dodge Ram 2500 Diesel al/rm st

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=44034
Printed Date: July 18, 2025 at 5:52 AM

Topic: 2003 Dodge Ram 2500 Diesel al/rm st

Posted By: J.T. corbitt
Subject: 2003 Dodge Ram 2500 Diesel al/rm st
Date Posted: November 29, 2004 at 9:48 AM

I am trying to install a Audiovox Prestige 786 alarm and remote start in this vehicle. I have found several wiring color codes bu most conflict on some of the wires on the truck.

The Glow Plug wire location. Is it on the ECM on the lower driver side of the engine or on the PCM on the passegner firewall?

The Tach wire location. Is it on the PCM and what location?

The wires in the driver kick panel for the door locks don't even resemle the colors that I found at Direct Wire.

Last but not least, I can't find a door trigger wire for the driver's door.

Any help or advise would be great

Replies:

Posted By: monster57
Date Posted: November 29, 2004 at 10:26 AM

it is on the lower driver side of the motor from what i recall there are 2 sets of wires it is the front one. looks like a steel box on the side of the motor can reach it from under the car better. The door trigger is lock and unlock on one wire u have to use resistors try whatever directed says get a couple extra try it cant damage it.

Posted By: monster57
Date Posted: November 29, 2004 at 10:29 AM

oh btw u dont need a relay on the door trigger

Posted By: J.T. corbitt
Date Posted: November 30, 2004 at 1:37 AM

Quick put the fire out!!!

I wired everything in. Although several opinions are out there about the tach wire, I wired it to the PCM, ORANGE / black, after testing it with a DMM and the engine running. This was the major wire that I still needed to hook up today. Now I have the following troubles at the dash.

ABS and Brake lights-On

Air Bag Light- On at start then off for about 2 seconds then on again

Speedometer not working. Cruise and Door auto locks not engaging (may be from speedometer not working)

No A/C the at the button or heated mirrors. The level control is also out. I know that the heated mirrors worked this morning prior to connecting the tach wire. WHAT HAVE I DONE?

Posted By: Velocity Motors
Date Posted: November 30, 2004 at 1:59 AM

There are several IGN & ACC wires that all need to be powered up during remote start that you probably did not hook up yet. Make sure that yo have these hooked up in the ignition switch harness:

As far as the speedometer, remove that connection from the PCM and find a YELLOW/WHITE wire on the driver's side of the cylinder head in a 4 wire gray connector.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: jaurora
Date Posted: November 30, 2004 at 9:16 AM

Also on that alarm the GREEN/ YELLOW wire (GLOW PLUG) is not necessary. The unit needsto be programed from gas to diesel and change the setting in the program mode for either a 10,15,20 second warmup before the truck starts. All this can be found in the remote start programing portion of the manual.

Remote Starter Wiring Colors and Notes
Function	Vehicle Color	Location
Start:	YELLOW	IGNITION SWITCH HARNESS
Ignition #1:	BLUE (16 AWG)	IGNITION SWITCH HARNESS
Ignition #2:	RED	IGNITION SWITCH HARNESS
Ignition #3:	GREEN & ORANGE (2 WIRES)	IGNITION SWITCH HARNESS
Accessory:	BLACK/ WHITE & BLUE (2 WIRES)	IGNITION SWITCH HARNESS
Brake Light:	WHITE/ TAN	AT SWITCH ABOVE BRAKE PEDAL
Tach Signal:	TAN/RED	AT IGNITION COIL
Parking Lights:	PURPLE / YELLOW	HEADLIGHT SWITCH*
Headlights:	PURPLE / YELLOW	HEADLIGHT SWITCH *
Diesel Glow Plug:	ORANGE / Black	Powertrain Control Module***
Clutch Bypass Wire:
Notes:	* This Is A Single Wire System. Parking Lights Need To See A Ground (-) Through A 330 Ohm Resistor. Headlights Need To See A Ground (-) Through A 700 Ohm Resistor. Diesel Vehicles - ORANGE / Black Wait to Start; Tach Wire Is Gray/Black. Both Wires Are Located In A Black Connector Center Top Of Fire Wall. There Are Two Black Connectors, The Correct One Does Not Have A White Insert. * Tach can also be located at pin 74 behind instrument cluster

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MECP certified (If it really means anything)
Jeremy

Posted By: partyguy
Date Posted: November 30, 2004 at 5:23 PM

what about the disarm resistance got one?

Posted By: Velocity Motors
Date Posted: November 30, 2004 at 6:56 PM

Arm/lock is negative trigger thru a 2K ohm resistor. Disarm/unlock is negative trigger thru a 480 ohm resistor. Single pulse will do disarm without unlocking the doors. Unlock requires a double pulse. MUST use relays.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA