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=47973
Printed Date: May 15, 2025 at 2:49 PM

Topic: tach wire

Posted By: wgasca
Subject: tach wire
Date Posted: January 17, 2005 at 9:13 PM

How do you test the tach wire to make sure its the right one?

Replies:

Posted By: Hymer
Date Posted: January 17, 2005 at 9:16 PM

Look for an ac voltage It should increase and decrease with the vehicles rpm... what car?

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Tire Proz Stillwater Mn
High End Restyling and Comlete Repair

Posted By: BNLUIS
Date Posted: January 17, 2005 at 9:17 PM

How to find a tachometer wire with your multimeter:

1. Set to ACV or AC voltage (12V or 20V is fine).

2. Attach the (-) probe of the meter to chassis ground.

3. Start and run the vehicle.

4. Probe the wire you suspect of being the tachometer wire with the red probe of the meter.

5. If this is the correct wire the meter will read between 1V and 6V.

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Luis
Sound Waves
Is up to the installer to test all wires with a DMM whenever possible.

Posted By: Jschult3
Date Posted: January 17, 2005 at 10:23 PM

Some cars will read a little different than others. You'll know you have it when the voltage increases as you rev up the engine. Then as the rev's come down so should the AC voltage.

Should show 0 volts AV(VAC) whe the car engine is off.

If you cannot find the tach wire specified in the diagram or it's just inconvenient to get to you should be able to teach the unit the TACH from a few other place like fuel injector wires, or near your transmission control module, if you have one.

What type of car as HYMER said?

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Jeff
Always Verify Wire information before Connecting! Just a Darn Good DIY'R

Posted By: wgasca
Date Posted: January 17, 2005 at 10:54 PM

its a 01 honda accord lx 4 door

Posted By: thepencil
Date Posted: January 18, 2005 at 9:55 AM

HONDA, ACCORD, 2001, Tachometer

The tach test connector is located behind the battery on the 4 cylinder, and on a bracket attached to the drivers side strut tower on the 6 cylinder motor. The tach test connector is a white 2 pin connector, and may be covered by a black rubber boot.

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Be careful whose advice you buy, but be patient with those who supply it. posted_image

Posted By: johnnydi77
Date Posted: January 18, 2005 at 6:43 PM

The test connector most likely will have blue tape on it.

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John J. DiStefano Jr.

Posted By: wgasca
Date Posted: January 18, 2005 at 7:19 PM

i found the wire but when i rev the engine the voltage decreases and when i let go it goes back up. do i have my dmm set wrong?