So the starboard (on the right if you’re standing at the back of the boat facing forwards) tacho has not worked for ages and I finally got around to looking at that last weekend. The tacho reads the slight changes in voltage from the alternator and the needle moves based on how fast the alternator is spinning. That is of course assuming that the alternator is putting the right output on the wire going to the tacho.
You’d think that the alternator is working fine if you’re able to get 50 Amps out to charge the batteries but all indications were that the alternator was the problem. Unfortunately there were no markings visible so I had no idea what type of alternator I have other than 12 volts. Anyway, cutting a long story short I've now removed the alternator and found that it is a 90 Amp alternator (which explains why one of the three phases is not working and I can still get almost 60 Amps).
On Tuesday it’s off to the shop for that to be repaired so that the tacho will work again but probably more importantly we’ll be able to get 90 Amps in to the batteries when we need it.
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