Make sure the ground is good by rigging a jumper to bypass the wiring harness.
If tach works then troubleshoot by cleaning ground stud and terminals at engine. If that doesn’t work verify continuity through the ground wire. I had exactly this issue, replaced the tach, then determined that the ground was oxidized. Cleaned that up, returned the tach, (thankfully) it’s been good since. Basics first. Good luck. Dave. 33-2 Sent from my iPad > On Oct 31, 2019, at 5:53 PM, sv Rebecca Leah <[email protected]> wrote: > > Does anyone know anything about Yanmar 4JHE tachs? Rewired my engine, now > tach fails to work. Tried new tach no help. > Pickup off flywheel shows an ac voltage that increases with rpm. > Tacoma desiel had me check cleanliness of pickup. No dirt. > At a loss. I need help. > > > Doug Mountjoy > Sv Rebecca Leah > C&C LF39 > 253-208-1412 > Port Orchard YC wa.
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