Locating Tachometer 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=3338
Printed Date: May 05, 2025 at 10:04 AM

Topic: Locating Tachometer wire

Posted By: attism
Subject: Locating Tachometer wire
Date Posted: September 04, 2002 at 9:19 PM

I need help installing a Prestige APS 750a on a 94 Nissan Altima. I having trouble finding the Tach wire. What is the function of this wire? When I connect all 6 wires from the wire harness and activate the remote starter, the starter continues to attempt to start the vehicle although the car has already started and running. Then after 5 seconds, it stops. Then 5 more seconds, the whole unit shuts off. What might I be doing wrong?

Mike

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MA...

Replies:

Posted By: JuskidnRu
Date Posted: September 04, 2002 at 10:28 PM

The alarm will continue to try and start the car if the tach wire is not hooked up correctly. The purpose of the tach wire is to tell the alarm CPU that the car is already running and only then will it stop spinning the starter.

"Work like you don't need the money, Love like you've never been hurt, and dance like you do when nobody's watching."

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JuskidnRu

Posted By: cpgoose
Date Posted: September 05, 2002 at 2:18 PM

Well, according to this chart from the 12volt.com, your tach wire is a Green wire at the coil. I'm not sure on your car, but I didn't want to have to go through the firewall to hookup to the tach wire...so I actually found the same wire in a mess of wires behind the driver's knee panel (the plastic panel above the driver's knees and to the left side).

https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1994&make=Nissan&model=Altima&ID=18523&type=Alarm

Posted By: mobiletoys2002
Date Posted: September 05, 2002 at 2:47 PM

hey atism if your alarm has a voltage sense feature you don't even need a tach if you choose to go that route, although most times it is better to connect to a tach wire. But i have used voltage sensing without any problems it is especially usefull in newer cars because of the fact that they start up like nothing. Check your manual and see if you have that feature if you don't wanna run a tach. Then follow the manufactures directions most alarms just need to be programed for this feature.

Posted By: attism
Date Posted: September 09, 2002 at 12:04 PM

Thanks Guys for all your responses. I was able to find the Tach wire at the ECM Control Module. I brought the repair manual for my car and found out that the ECM has an outgoing wire to the tachometer. Now it works like a charm.

Thanks Again!!

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MA...