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Tachometer wire testing


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mai42356 
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Posted: August 15, 2016 at 6:51 PM / IP Logged Link to Post Post Reply Quote mai42356
Does anyone know of a good way to test to see if a wire is a valid tach input wire for remote start. I was thinking maybe using an analog meter and using the voltage scale to see if the the needle bounces increasingly as RPMs rise. Anyone have better information of a known good practice?
lurch228 
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Posted: August 15, 2016 at 6:56 PM / IP Logged Link to Post Post Reply Quote lurch228
DMM set to ac is the most common way.
mai42356 
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Posted: August 15, 2016 at 7:27 PM / IP Logged Link to Post Post Reply Quote mai42356
Is there a recommended voltage range to use?
Would perhaps an analog meter would be more visually intuitive do you think?
lurch228 
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Posted: August 15, 2016 at 7:53 PM / IP Logged Link to Post Post Reply Quote lurch228
Lowest Ac setting is good enough. No as the frequency will be to high to see the inverse of the AC sine wave only the peak (high).
mai42356 
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Posted: August 15, 2016 at 7:58 PM / IP Logged Link to Post Post Reply Quote mai42356
Thank you.
lurch228 
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Posted: August 15, 2016 at 8:17 PM / IP Logged Link to Post Post Reply Quote lurch228
Your welcome.
i am an idiot 
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Posted: August 15, 2016 at 8:19 PM / IP Logged Link to Post Post Reply Quote i am an idiot
Depending on the meter you need to try it on AC and DC volts. The correct wire will show an increase in voltage when you rev the engine.
It is actually a pulsating DC voltage. Some meters will read it as AC and others will read it as DC. Once you figure out which one works on your meter it will be the same vehicle to vehicle.

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