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Tachometer and wiring

Dcreech0
Dcreech0
in Help Me !!

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comment_627229
  On 8/19/2021 at 4:32 PM, Dcreech0 said:

Please watch and give some insight. 

IMG_7379.MOVFetching info...

You missed a key detail in my video. I said ALL the wires were disconnected. You had the ignition wire connected to the ballast resistor along with the green/white wire. That's why you had voltage on the black/white at coil positive.

Anyway, all the wires are connected properly. Post a photo of the back of the tach if it's still out. Let's make sure it's a 240Z tach. It would take some rewiring to mate a later tach to a 240Z, but with the other surprises on your car, we don't know what we're going to find.

    • Like 1
    • Author
    comment_627230
      On 8/19/2021 at 9:30 PM, SteveJ said:

    You missed a key detail in my video. I said ALL the wires were disconnected. You had the ignition wire connected to the ballast resistor along with the green/white wire. That's why you had voltage on the black/white at coil positive.

    Anyway, all the wires are connected properly. Post a photo of the back of the tach if it's still out. Let's make sure it's a 240Z tach. It would take some rewiring to mate a later tach to a 240Z, but with the other surprises on your car, we don't know what we're going to find.

    The tach is the correct tach. I have read as much as I could on them and learned It is the four wire tach with the loop that reads current for the rpm. 

    comment_627232
      On 8/13/2021 at 1:19 PM, Dcreech0 said:

    getting my tachometer to work

    So, what, in detail, does the tach do and not do?  Does the needle twitch at all when you turn the key on or start the engine?  These old tachometers fail often and in many different ways.  

    • Author
    comment_627233
      On 8/19/2021 at 9:56 PM, Zed Head said:

    So, what, in detail, does the tach do and not do?  Does the needle twitch at all when you turn the key on or start the engine?  These old tachometers fail often and in many different ways.  

    It does absolutely nothing. Totally dead

    comment_627238
      On 8/19/2021 at 9:30 PM, SteveJ said:

    You had the ignition wire connected to the ballast resistor along with the green/white wire. That's why you had voltage on the black/white at coil positive.

    You might take those measurements again, following SteveJ's instruction.  Make sure that the current is actually passing through the loop.  You could also take a measurement at the tach plug to make sure the voltage is getting to the tach.  Then you'll know for sure.

    comment_627239
      On 8/19/2021 at 10:07 PM, Dcreech0 said:

    When doing the continuity tests at the coil and ballast, yes the tach was plugged in. 

     

      On 8/19/2021 at 10:08 PM, Zed Head said:

    You might take those measurements again, following SteveJ's instruction.  Make sure that the current is actually passing through the loop.  You could also take a measurement at the tach plug to make sure the voltage is getting to the tach.  Then you'll know for sure.

    If you saw continuity, then never mind.

    • Author
    comment_627241
      On 8/19/2021 at 10:01 PM, Zed Head said:

    You should put your videos on youtube.

    image.png

    https://youtube.com/shorts/d5huZZpAatU?feature=share

    https://youtube.com/shorts/qyWt6QMMlF0?feature=share

    https://youtube.com/shorts/s3u_VdbvO3c?feature=share

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