Tach wire question

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=42940
Printed Date: June 08, 2024 at 4:44 PM

Topic: Tach wire question

Posted By: jonbth
Subject: Tach wire question
Date Posted: November 14, 2004 at 2:05 AM

I hope this isn't a stupid question but why does a tach wire have AC voltage when the rest of the car is DC? How does it generate AC voltage?

Replies:

Posted By: jrilla
Date Posted: November 14, 2004 at 8:05 AM

Just What Is An Alternator?

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J Rilla

Owner/Installer

Posted By: jonbth
Date Posted: November 14, 2004 at 9:40 AM

jrilla wrote:

Just What Is An Alternator?

That still doesn't answer my question of why the tach wire is AC voltage.

Posted By: draasch
Date Posted: November 14, 2004 at 10:24 AM

The alternator gets its name from the fact that it generates alternating current (AC). The old generators I mentioned before generated direct current (DC). Well the battery can't use alternating current so the alternator output is fed into what are called diodes, which convert the AC into DC.

because the tach wires uses higher amperage....kinda like the spark plug wire..if you touch the spark plug, it will pretty much knock the crap out of you....yet the radio hot wire wont........

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Good Luck
David
Ace Security
813-376-9778
Tampa
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