Adice please.....Balmar 612 and 6-Series 60-70 not throttling back!!!

[Ed_Sailing_Ruby]

Good evening all.
I have recently completed installing a Balmar 6-Series 70Amp alternator, MC612 onto the Yanmar 3YM30 on my Hanse 370 located in Plymouth, UK.
Doing some final install today and testing I have encountered an issue where the external regulator does not appear to throttle back the alternator.

- What ever the field current is the alternator is still outputting 55-65 Amps

- New Balmar Temp sensor is connected and functioning correctly (the MC612 reads the correct temp and goes into alarm condition, verified against a 2nd temp sensor feeding into the Victron Cerbo)

- I have been measuring the voltage of the field current from the MC612, this has been reducing as appropriate. With Amp manger down to 20%, Field voltage was around 4V but still alternator current output was up at 60Amps!

- With the engine shut down the Field voltage still remains at 3V, is this normal? I couldn't work out where this is coming from.

- "Small engine mode" switch did nothing to output amps.

While the increase in power from the old alternator is great I'm very concerned it's not throttling back and is going to over heat, and also fry some batteries.

Any advice or further testing most welcome.
VMT
Edward

[pjShap]

Check the Balmar wiring instructions. Some of their alternators have an internal regulator, which always supplies full field voltage. You enable the internal regulator by putting 12 volts to one of the alternator wires, blue or brown if I remember correctly. You do not want that connected when using an external regulator.

[smac999]

No that is not normal. At 4v feild you should have like 20a.

When the key is off and the balmar lights go off. You should have 0v.

See above comment make sure you have not powered the internal reg which some balmars have as a backup.

[CharlieJ]

Balmar provides an excellent troubleshooting guide in the alternator and alternator regulator technical documentation.