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Old 04-30-2013
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Beta20 alternator vs battery

I had the alternator tested while the boat was in storage this winter. I re-installed it as it came out; one large wire to batt and two smaller wires with slip plug/spade ends. I marked them as to orientation before pulling.

This past weekend, while moving the boat home, I discovered that the batt wasn't charging. The batt was installed new several weeks ago. It read 12.54 volts. It was used to start the motor about 8 times when we moved from the well to the temp slip last week; 04/15-13. It seemed down a bit and was hard to turn over when we tried to get under way..seems I left the A/B/both/off switch on. The only item energized was the new depth finder; tho there *may* be other electrics aboard the have issues?!

Once started, I got a reading or two directly from the running alternator while underway. Both were close to or read as 13.5 volts. The GPS was showing only 10.5 or 11 volts!
Upon return to port, I hooked up shore power and ignited the charging system. Meter sez it's putting out 13.5 volts. Battery isolated sez 10.75-77 volts. After charging for several hours at , what supposedly was "bulk" charge..still only 10.77-79 VDC reading!

Charger in question is a (new) re-manf'd Pro charge 10a, two bank unit; tied together as per instructions for single batt. Alt is a std Kubota/Beta 40 amp.

Anecdotally, the marina guy sez that when they moved the boat from VA a yr and a half ago, his partner sez that the alt was not charging and the batt was draining!! Sounds ominously familiar?!?!
Could it be that the rat's nest of wiring left from the re-power job has hooked up something wrong? Could the two smaller wires be reversed? Having searched and read all morning; can someone point me in the right direction for a pictorial/wiring scheme for this particular alternator installation?

BTW... I see a full panel of instrumentation in my future

TIA,
Paul
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