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Old 04-04-2017, 08:05   #1
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Honda 9.9 Charging issues

I'm going to start the thread here first before I more over to engines.

I searched around this forum and could not find what I was looking for so here goes.

2006 Honda 9.9 long shaft outboard. We brought the boat up the Hudson last fall and the charging system on the outboard is not working. This is a new old boat for us. We did connect an inverter to the battery and was told we might of fried the charging system just not sure what.

Any help for the young new guy would be greatly appreciated.

Mike
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Old 04-04-2017, 08:25   #2
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Re: Honda 9.9 Charging issues

Have you checked to see if you are getting amps out of the battery cables that go from the engine to the batteries?
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Old 04-04-2017, 08:35   #3
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Re: Honda 9.9 Charging issues

It's off the boat now in my garage. We did stop at a marina on the way up last fall and he put a multi meter to the outgoing charge terminal and was not getting the correct read.

There is not terribly much to the system. Looks like a Regulator assembly and a charge coil.
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Old 04-04-2017, 08:36   #4
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Re: Honda 9.9 Charging issues

outgoing charge terminal on the motor
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Old 04-04-2017, 09:57   #5
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Re: Honda 9.9 Charging issues

As I recall, having owned a BF100 a few years ago, it's a dynamo. It produces little at idle but a lot (3 or 4 amps, again, from memory) at WOT.
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Old 04-04-2017, 10:06   #6
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Re: Honda 9.9 Charging issues

Quote:
Originally Posted by miked40 View Post
It's off the boat now in my garage. We did stop at a marina on the way up last fall and he put a multi meter to the outgoing charge terminal and was not getting the correct read.

There is not terribly much to the system. Looks like a Regulator assembly and a charge coil.

You know I think its like an older motorcycle, it is a rectifier and a charge coil.
99 times out of 100 its the rectifier that goes bad, that is assuming its like a motorcycle, which I bet it is
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Old 04-04-2017, 10:35   #7
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Re: Honda 9.9 Charging issues

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that is assuming its like a motorcycle, which I bet it is
Being a Honda I would bet a nickel you are right!
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Old 04-04-2017, 10:43   #8
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Re: Honda 9.9 Charging issues

What kills the rectifier on a motorcycle is heat, if i remember right, the power output is fixed, say 5 amps for example, if the bike only uses 2 amps, then the other three is wasted as heat in the rectifier, that is why they are so heavily finned, to dissipate heat

Read the permanent magnet generator part, I bet that is how an outboard works, I know the old ones worked this way and I bet the little ones still do.

Technical Article: How a Motorcycle Charging System Works - ElectroSport
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Old 04-04-2017, 12:19   #9
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Re: Honda 9.9 Charging issues

If I may. I had a Honda 100 on the back of my Grampian 26 for 30 years. It is a very reliable motor. One thing I learned was that it really didn't keep your batteries charged the way even one small solar panel would. I replaced it with a Tohatsu and didn't pay extra for the alternator. No regrets.
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Old 04-04-2017, 14:24   #10
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Re: Honda 9.9 Charging issues

Thanks guys.

Well she's open, so the finned unit is the rectifier/regulator? It has to be there isn't much more in here. One side has the oil filter fuel lines, up top is the starter pull and my side it the plugs some wiring. Hopefully that picture went through.

So that finned unit would be the best place to start?

Thanks in advance,
Mike
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Old 04-04-2017, 14:49   #11
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Re: Honda 9.9 Charging issues

So I did also come across this in the manual online.

The outboard motor’s 12-volt output
is designed to charge a ‘‘starting or
cranking’’ battery only. It is not
intended to charge a ‘‘deep-cycle’’
type battery. Lights and electrical
accessories for the boat should be
connected to the battery.

And yes it is hooked up to a deep cycle, previous owners set up. I found out that it puts out 6 amps. I could of swore that it would of charged our battery some the 8hrs during the day when we were not drawing on the battery???
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Old 04-04-2017, 15:11   #12
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Re: Honda 9.9 Charging issues

My Honda (9 hp +/-)(not sure) has a modular plug that plugs in the starboard side of the engine. Does yours have one of those? Mine is most likely older that yours, but not by much.
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Old 04-04-2017, 15:28   #13
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Re: Honda 9.9 Charging issues

Is this what you are referring to?
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Old 04-04-2017, 16:03   #14
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Re: Honda 9.9 Charging issues

https://youtu.be/hHPpWeC-4zI
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Old 04-04-2017, 16:03   #15
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Re: Honda 9.9 Charging issues

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Originally Posted by miked40 View Post
Thanks guys.

Well she's open, so the finned unit is the rectifier/regulator? It has to be there isn't much more in here. One side has the oil filter fuel lines, up top is the starter pull and my side it the plugs some wiring. Hopefully that picture went through.

So that finned unit would be the best place to start?

Thanks in advance,
Mike


I'd bet money on that being the rectifier / Regulator.
However before I spend your money I'd check the charging coils first with a multimeter, easy to do. I have never found one bad, but I have limited experience.
Can you get a manual? It should have the procedure, resistance values for the coils etc. .
That looks exactly like the rectifier on my old CBR 1100XX which was the last one I changed.
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