is this my 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=90946
Printed Date: May 10, 2025 at 7:01 AM
Topic: is this my tach wire?
Posted By: rppngears
Subject: is this my tach wire?
Date Posted: February 24, 2007 at 10:38 PM
I'm just about done installing a Viper remote start on a 2004 Hyundai Tiburon. I'm stuck on the tach wire though. The wiring diagrams I have looked up specify it is a white wire in passenger kick panel in a 23 pin connector. I found this wire, but it has a constant 5VAC signal on it as long as the engines running and 0v when the engine's off. Sounds good, except, the voltage does not vary with rpms as I would have expected it to. Is this still a valid tach signal?
Replies:
Posted By: mikvot
Date Posted: February 24, 2007 at 11:47 PM
Doesn't sound like it. The tach should increase or decrease with rpm.
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Posted By: kaezoo
Date Posted: February 25, 2007 at 8:20 AM
I've used quite a few tach connections that don't vary with RPM. The remote start system is measuring frequency, not voltage, so a voltage variance with RPM isn't essential. If you're getting 5VAC on the wire with the engine running, and it's the wire specified in your reference, then I'd use it.
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