Damariscotta
Member
- Joined
- Feb 16, 2024
- Messages
- 7
The Tach on my 1972 Grand Banks 32 stopped working. it appears to be electronic (off alternator I'm told?) anyone have any experience with this.
Tach short. "Path of least Resistance.." Good one!!If it's like my 1968 GB, the early Lehman tachs are driven from a pulse generator located directly below the coolant pipe running down the starboard side of the engine. The pulse generator is driven off of the cam.
Mine also stopped working after I did some work, and I realized the coolant pipe was touching both contacts and shorting the signal. I cut the bulb off of a turkey baster and stuck it over the tach sender to insulate it electrically from the coolant pipe and that solved my issue.
When I consulted with Brian Smith at American Diesel about this, he told me the pulse generators aren't available anymore, and recommended converting to an alternator-driven tach as the modern equivalent. So, if it turns out your sender is actually dead, that might be the path of least resistance.