1996 GMC Jimmy tach wire
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=49268
Printed Date: May 31, 2024 at 8:12 AM
Topic: 1996 GMC Jimmy tach wire
Posted By: jasonx413
Subject: 1996 GMC Jimmy tach wire
Date Posted: February 03, 2005 at 11:49 AM
Hello everyone, I need alittle help and i do not know were else to turn. I am installing a 996a starter/alarm in a 1996 gmc jimmy with a 4.3L. I am up to the point where i need to hook up the tach wire. I search on here for answeres before i posted and from what i gather it should be a white wire on the ECM. I can not seem to find the wire coming off the coil. One side of the ECM is marked "black" and the other is "white". One the "white" side of the ECM i see a white wire in a plug. If i hook up a test light to this wire will the light glow brighter if the engine is reved? Sorry if this is a stupid question but i am trying to get this done after 2 days of headaches. Thank you
Replies:
Posted By: italnpimp59
Date Posted: February 03, 2005 at 12:29 PM
DO NOT USE A TEST LIGHT EVER!!!! that is a quick way to fry the ECM. use a multimeter to test for a tach wire. the AC voltage will fluctuate as the engine is reved up.
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Posted By: jasonx413
Date Posted: February 03, 2005 at 1:05 PM
thanks for the reply. I just got back from radio shack with multimeter in hand. I hate to ask this but what do i turn the dial to on the multimeter? I know it is ACV but i have 500V, 200V then 200ma, 20ma, 2ma.
Posted By: gus1
Date Posted: February 03, 2005 at 1:36 PM
white.... on the plug marked "white". It's the only white wire in there.
Gus
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Wherever I go, that is where I end up......
Posted By: jaurora
Date Posted: February 03, 2005 at 2:40 PM
When testing with a multimeter, Set it to AC Volts Set it to the lowest possible setting. Ground the black probe Strip a small piece of insulation on the suspect wire. With the engine running, touch the red probe to the bare copper wire. The numbers will bounce around a little but the number will increase with a higher RPM level. Usally between 1 - 5 volts. If this happens it is the correct wire. ------------- MECP certified (If it really means anything)
Jeremy
Posted By: jasonx413
Date Posted: February 03, 2005 at 3:05 PM
Thank you for the help, the white wire did just what you said so i knew i had the right one. Just got done installing everything but it will not start. I pushed the key button 2 times and all i get is beeps from the remote and the control module sounds like a turn signal flasher.
Any idea what could be wrong. This is the last thig i need to figure out so i can put the car back together. Thanks again for the help.
Posted By: jaurora
Date Posted: February 03, 2005 at 3:13 PM
You need to program the tach. To do so follw these steps. 1) Turn the key to the on/run position. 2)Press and release the program switch 3 times. 3)immidetaly turn the key to off. (alarm will cherp) 4)immeditaly press and hold the program switch and start the car by using the key. 5) the unit will flash the led and/or parking lights when the tach is learned, then release the program switch, The tach has now been learned. You should be able to remote start it know. Let me know how you make out. ------------- MECP certified (If it really means anything)
Jeremy
Posted By: jasonx413
Date Posted: February 03, 2005 at 3:55 PM
Thank you very much it worked!!!!! The only thing is all the while i have no siren chirp. I have it hooked up right but no sound. All i get is the remote going off when the alarm is tripped.
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