I am confused how the engine panel tach get's its input. The available lead from the alternator is connected to nothing, the contact on the Balmar smart regulator is unused.
Strider, #332 has Yanmar 3YM30 and 110A Balmar Alternator
p.s. I suppose it is possible I disconnected the lead from the alternator while doing engine work and replacing the engine panel in the same project, but don't see any left over wires anywhere.
Tachometer Connection
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Vento Solare
- Posts: 416
- Joined: Wed Dec 31, 1969 8:00 pm
- Location: Newport, RI
Re: Tachometer Connection
What model regulator is it?
The Tach gets input from the stator so it can count zero crossings as pulses which are directly proportional to the engine rpm. Some regulators condition the output tor the tachometer so the Tach is connected to the appropriate terminal on the regulator instead.
I have the same Balmar 110 Amp alternator as you but have the Xantrex XAR regulator, which has a separate output for the tach. Note that terminal 2 on the alternator should either connect to the tach, or the stator terminal on the regulator if the regulator then feeds the tach.
The Tach gets input from the stator so it can count zero crossings as pulses which are directly proportional to the engine rpm. Some regulators condition the output tor the tachometer so the Tach is connected to the appropriate terminal on the regulator instead.
I have the same Balmar 110 Amp alternator as you but have the Xantrex XAR regulator, which has a separate output for the tach. Note that terminal 2 on the alternator should either connect to the tach, or the stator terminal on the regulator if the regulator then feeds the tach.
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Dan Corcoran
- Posts: 302
- Joined: Sun Jan 29, 2017 4:32 pm
Re: Tachometer Connection
My boat may be different as neither the stator (in) or the tach (out) pins on my Balmar MC-614 are wired to anything.
It's as if there is some sensor not connected to the alternator.
The wire to the DC panel tach is the orange wire from the 8-wire cable.
Dan
It's as if there is some sensor not connected to the alternator.
The wire to the DC panel tach is the orange wire from the 8-wire cable.
Dan
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Dan Corcoran
- Posts: 302
- Joined: Sun Jan 29, 2017 4:32 pm
Re: Tachometer Connection
There is an option for a magnetic pickup on the flywheel housing on figure 6 of the 3YM30 parts manual. I will look there when next on Strider.
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Vento Solare
- Posts: 416
- Joined: Wed Dec 31, 1969 8:00 pm
- Location: Newport, RI
Re: Tachometer Connection
You won't have the magnetic sensor. Use the stator output from the alternator. That is what the tachometer in your engine panel is made for. Was the MC-614 installed as a replacement for the original voltage regulator? If so, whoever installed it did not do a proper connection. I installed an MC-618 on J/122 Alliance when we installed a high capacity alternator and had to run a separate wire. This wasn't a Yanmar engine or panel, but the basic regulator and alternator connections follow the same philosophy.
See the 3YM service manual page 184. The orange wire at the instrument panel is the tach lead. If you look on the diagram, that goes through a Molex connector located as a flying yellow lead on the standard Hitachi alternator. Most of the high output alternators such as yours have a screw terminal with a hex nut. Look at the Alternator spec sheet link I put in the previous post and you'll see terminal 2 is the stator/tach output.
See the 3YM service manual page 184. The orange wire at the instrument panel is the tach lead. If you look on the diagram, that goes through a Molex connector located as a flying yellow lead on the standard Hitachi alternator. Most of the high output alternators such as yours have a screw terminal with a hex nut. Look at the Alternator spec sheet link I put in the previous post and you'll see terminal 2 is the stator/tach output.