R/S 2003 Freightliner
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=25956
Printed Date: November 03, 2025 at 10:45 PM
Topic: R/S 2003 Freightliner
Posted By: Craig3708
Subject: R/S 2003 Freightliner
Date Posted: February 06, 2004 at 4:01 PM
I've installed many r/s in big trucks, but this knew Freightliner has a one piece insturment cluster (instead of all seperate gauges). The problem i'm having is I can't find the tach wire, or any wire that will give me signal when it is running. I have tried the Data wires but seconds before it starts it does a gauge scan and sends signal to the tach wire and it will only crank for a second . This leaves a code that says tach signal detected before crank. Any ideas where I can get a wire that will give me a signal after it is running. My second question is the door locks. When the lock (or unlock) button is pressed the signal is (+) when the button is at neutral (not pressed) this same wires goes to ground (-). The r/s has (-) outputs. Any idea how to make this work?????? Craig...
Replies:
Posted By: prdjr165
Date Posted: February 06, 2004 at 4:28 PM
Your door locks are reverse polarity.you can get a diagram from this site.I can't help on the tach wire,sorry.
Posted By: Craig3708
Date Posted: February 06, 2004 at 4:41 PM
I can't even do the diagram thing because the doorlock wires rest at (-). If I tap a (+) signal to this wire I will put a postive and a negitive together................
Posted By: ck auto
Date Posted: February 06, 2004 at 5:30 PM
hi what model freightliner are you trying if it does thre guage check then it is most likely a m2 of fl series. i work for a freightliner dealer let me know and i may be able to find wireing diagram for you
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good luck
kirk
Posted By: Craig3708
Date Posted: February 06, 2004 at 5:58 PM
Its a Freightliner Coronado with a series 60 Detriot engine... Craig....
Posted By: ck auto
Date Posted: February 06, 2004 at 6:41 PM
hi you don't mess around pick the expensive one's to play with what part of canada are you in i will check on the wiring hopefully you don't have truck apart and waiting im not at work right now
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good luck
kirk
Posted By: jgold47
Date Posted: February 06, 2004 at 6:48 PM
Craig3708 wrote:
I can't even do the diagram thing because the doorlock wires rest at (-). If I tap a (+) signal to this wire I will put a postive and a negitive together................
5 wire a relay...this is common on dodge ? I think..... 30 goes to door lock relay. 87 to ground 87a 12v and diode isolate the switch side ? but sh*t I am so rusty with this stuff....but the door lock problem is not a big one, its pretty common...
Posted By: Craig3708
Date Posted: February 06, 2004 at 6:49 PM
Yes the truck is apart, I'm going back at it in the morning. And I am in Corner Brook, Newfoundland..... Craig...
Posted By: ck auto
Date Posted: February 06, 2004 at 9:38 PM
hi the cut the suspected door lock wire if you lose locks on both doors then they are reverse polarity. the tach wire i don't have yet calll your local dealer if i don't get it in time or go down their a box of donuts goes a long way with us mechanics also try finding tach at the ecm on the drivers side of engine will be silver box the size of a phone book you'll have a tach signal their i will try and get info for you.why not try voltage sense then you don't have to worry about the tach
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good luck
kirk
Posted By: Craig3708
Date Posted: February 07, 2004 at 6:19 PM
Hey , I've finaly got a tach signal, well an injecter wire anyway and all works well. Also got the door locks wired R/P. I coulden't use voltage sense because the CT-3300 does not have that option. Thanks for your help Craig....
Posted By: bmf1000d
Date Posted: February 07, 2004 at 6:25 PM
Next time you run into this problem you can wrap a wire around a glow plug or plug wire and use it like a coil, wrap around like 15 or more times and then hook that up for a tach wire as a last restort
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"Big" Mike
Double Take
Fremont, Ne
remember to check all your wires with a dmm not a test light!!
i take no responsibilty whatsoever for the vailidty of the info nor consequences thereof
Posted By: Craig3708
Date Posted: February 07, 2004 at 6:48 PM
Diesel engines dont have plug wires. nor does these big engines have glow plugs, which is why I had to use an injecter wire...
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