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Recent content by Ranger_Trivette

  1. R

    Tachometer stays at 0 RPM or jumps to max while engine is running

    First of all, thank you all for your help. I bought another RPM gauge, and I also bought a purpose-built RPM signal filter that is supposed to clean up the signal. The results: The original tachometer still doesn’t work, so I can confirm that it is broken. The first aftermarket tachometer I...
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    Tachometer stays at 0 RPM or jumps to max while engine is running

    Big UPDATE :) I did some tests. The original tachometer is broken. Giving it an impulse doesn't make it show anything. The first tachometer I bought works. The needle moves if I repeatedly tap the signal wire against 12V. By accident, I set it to 1.0 instead of 3.0. Connected to the negative...
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    Tachometer stays at 0 RPM or jumps to max while engine is running

    So, I tested the tachometers. The original one is broken, but the new ones work properly. After consulting the electrician at my company, we think the problem could be caused by the condenser in the distributor. I’ll replace it, but first I’ll try adding a 1–10 kΩ resistor to the tach signal...
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    Tachometer stays at 0 RPM or jumps to max while engine is running

    On Monday I’m going to test the Chinese tachs with a signal generator, so we can definitively rule out the possibility that they are actually all faulty. In the first configuration, I connected the boat’s gray wire to the new tach. When I turn the ignition on, the tach lights up and the needle...
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    Tachometer stays at 0 RPM or jumps to max while engine is running

    I went back to the boat today. I reinstalled the ignition coil, and the engine starts and runs perfectly. This time I connected the original tachometer, which I had actually never tested before: Positive directly to the battery Negative directly to the battery Grey signal wire directly to the...
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    Tachometer stays at 0 RPM or jumps to max while engine is running

    one from amazon, one from aliexpress. i'm attaching a screenshot. I also suspected the wiring, so for the second tach I completely bypassed the boat wiring. I powered it directly from the battery (+ and ground), and ran the signal wire directly to the negative terminal of the ignition coil...
  7. R

    Tachometer stays at 0 RPM or jumps to max while engine is running

    I’m running out of ideas. This situation just doesn’t make sense to me. This winter I restored a 1985 Glastron V194 with an OMC 3.8L V6. The boat runs fine. Maybe it should be a bit faster, but before doing any serious troubleshooting I really need to know what RPM the engine is actually...
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