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Tachometer Negative Pulse, 92 Civic


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campeche188 
Member - Posts: 10
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Joined: August 21, 2007
Location: United States
Posted: March 20, 2008 at 8:30 PM / IP Logged  

Hi, I am  trying to connect a Tachometer in my 92 honda civic but, the tach uses a negative pulse and my car have a positive signal, I read the book and says is the blue wire coming from the distributor, but that wire has 12v.  is there any other place to connect my tach wire? do I need to buy additional parts? any help will be appreciated.

Thanks.

the racing turtle
KPierson 
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Joined: April 14, 2005
Location: Ohio, United States
Posted: March 20, 2008 at 8:59 PM / IP Logged  

How much horsepower does your '92 Honda Civic have?

Have you tried hooking it up to the blue wire just to see if it would work?  What does the blue wire read when the motor is actually running (I'm sure you realize that a tach signal can't be metered with the motor off).

Kevin Pierson
campeche188 
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Joined: August 21, 2007
Location: United States
Posted: March 21, 2008 at 7:37 PM / IP Logged  

Thanks for the response,

Yes I actually have the blue wire attached to the Tach and I drive the car every day, only the lights come on but, rpms won't work, I am sure I have a good ground connection, I tested the blue wire with my voltometer  (AC reading) and when I depress the accelerator the reading will go up, so I am assuming blue wire is ok.  my tach should be ok too since is new. 

I don't know how much HP my car has

Thanks.

the racing turtle
campeche188 
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Joined: August 21, 2007
Location: United States
Posted: March 26, 2008 at 5:12 PM / IP Logged  

Hello There!

I am still waiting for a response. I haven't figured out my problem.

Thanks much.

the racing turtle
zziggy 
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Joined: January 14, 2006
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Posted: March 28, 2008 at 4:53 PM / IP Logged  
using a complicated tool like a test light will show that the blue wire has a pulsing look top it at idle
campeche188 
Member - Posts: 10
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Joined: August 21, 2007
Location: United States
Posted: March 30, 2008 at 11:19 AM / IP Logged  

The blue wire has pulsing, when a raise my car's rpms the voltage changes but my tach won't read it.

the racing turtle

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