hpdi charging issue

[doubletrouble]

My port 2000 200hp HPDI is not charging properly. I have the aux charge lead hooked up to the house battery on this motor and on my last trip out my GPS voltmeter showed the house battery was being charged at 14.7 volts. This is much higher than I have ever seen it charge. I neglected to check what the starting battery was being charged at but a couple days after the trip I checked the two batteries voltage and the house battery read 12.83 and the starting battery read 10.50.

The batteries are 6 month old AGM's and I believe they are in great condition as I checked their voltage before the trip and both read in the 12.8 range. Does this sound like a bad rectifier/regulator or a bad lighting coil?

Also, no accessories were left on to run the starting battery down.

[boats.net]

Have the battery tested to make certain is ok. Remove and clean battery cables and battery post, tighten battery cables with nut and lock washer( do not use wing nuts on battery). clean and tighten battery cables at engine.

Charging issues

I just saw your posting. I have a 2003 200 hpdi . I have had some charging Issues for the past three years. If i was drifting for several hours my house battery also would run down and my GPS low battery alarm would sound. I purchised the Yamaha second battery tricle charger wire installed a second battery cut off switch for when I left the boat.I purchise a 1000 MCA starting battery and a New deep cylce house battery.I replaced all of the battery cables including soldering the connectors and shrinkwraping them. I have been complaining to Yamaha for the past few years and have conducted every test they recomended. Now that my extended Warrantee has expired, the yamaha tech (moonlighting) has told me he thinks my regulator rectifier is not working proerly. I am getting a charge to the batteries. at 1500 RPM its about 4-8 amps. At 5300 RPM if I try to trim my motor I drop three to five hundred RPM, my volt meter goes from 14.8 down to 11.4 .As soon as I stop triming the motor the engine runs fine. the stata and coils all tes 100% perfect. how do I test this rectifier? Will yamaha goodwill it it it is bad? I should mention I was on a mooring for the past 15yrs. It has been a real nightmare wondering if my batteries were going to make the trip. I had to start carring a jumper to make sure I could get home.
Bill