What is causing this alarm on my Honda O/B?'

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DaveC426913
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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Sun Aug 02, 2020 9:04 pm

Plan to head down the dock tomorrow. Of course... the day everything's closed. Hope I don;t need a part. :(

I'll check every connection.
I'll check the battery - see if it's dead. If so, I"ll disconnect it.

Is there anything I can do to root out any alternator problems?
MacX 2000 Honda BF50A 'SeaSaw'

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Be Free
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Re: What is causing this alarm on my Honda O/B?'

Post by Be Free » Mon Aug 03, 2020 7:50 am

The alternator on this engine is very simple. What kind of problem do you suspect?

DaveC426913
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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Mon Aug 03, 2020 8:37 am

Be Free wrote:
Mon Aug 03, 2020 7:50 am
The alternator on this engine is very simple. What kind of problem do you suspect?
Not charging the battery, of course.
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Re: What is causing this alarm on my Honda O/B?'

Post by Jimmyt » Mon Aug 03, 2020 10:48 am

What test equipment do you have?

You can use a volt meter to compare the voltage not running to the voltage while running. Preferably do this when you haven't run the boat, or charged the battery on a charger for a day or so - so the battery will need charging after cranking.

If running voltage is higher right after startup than it was before cranking on it, the system is charging.

This test applies to good batteries. A failed or failing battery can behave strangely.
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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Mon Aug 03, 2020 1:41 pm

The wire leading to the rectifier is causing the alarm (if I disconnect it, the alarm stops). I assume that's actually the alarm telling me the rectifer's plotzed.

There are 4 other connectors: 3 gray and 1 black/white - and a ground.
Presumably, b/w is power.
Image

I have taken the device off and brought it home.

I read the manual and looked at some videos online.

Got my meter set to diode but I'm not sure exactly how to probe it. I put the red probe on a lead and the black probe ... into the ground socket of an outlet?
MacX 2000 Honda BF50A 'SeaSaw'

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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Mon Aug 03, 2020 2:17 pm

OK, here's what I tried:

Red probe to black/white connector, and
Black probe to...
... grey connector 1: metre reads "1" (I assume that means infinity).
... grey connector 2: metre reads "1".
... grey connector 3: metre reads "1".

Black probe to black/white connector, and
Red probe to...
... grey connector 1: metre reads "1".
... grey connector 2: metre reads "1".
... grey connector 3: metre reads "1".

Either probe to black/white connector, and
Other probe to..
... white (alarm?) connector: reads 0.

Either I'm doing this wrong or my rectifier is rect.
MacX 2000 Honda BF50A 'SeaSaw'

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Re: What is causing this alarm on my Honda O/B?'

Post by opie » Mon Aug 03, 2020 2:53 pm

This thread took a turn towards a rectifier question so I will fuel the thread fire with old links of mine. : - )

http://www.macgregorsailors.com/forum/v ... 52#p186052

http://www.mfgsupply.com/m/c/01-090-1.html

http://sites.google.com/site/universalvoltageregulator/


DaveC426913
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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Mon Aug 03, 2020 3:12 pm

Awesome. Thanks for that.

I think I will replace the rect rectifier and just avoid turning off the power when motor is on.

Also, I think I will either recharge or replace my dead battery and, in the future, be more mindful of good, solid battery terminal connections.
MacX 2000 Honda BF50A 'SeaSaw'

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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Mon Aug 03, 2020 3:17 pm

Incidentally, not really a gear-head, so I am quite pleased with my patience and success in both locating the offending connection and in consulting the manual to find out exactly where it led to.

It's a general purpose manual, so there are no less than 20 electrical diagrams - at least six of which are for this motor in various sub-flavours.
MacX 2000 Honda BF50A 'SeaSaw'

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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Tue Aug 04, 2020 1:38 pm

So, the part is gonna take two weeks.

Question: if all it does is recharge the battery, and my motor was running OK, is there any reason why I can't pop the busted rectifier back in* and go sailing while I wait? I recharge my batteries from shore power anyway, so they're fully charged when I go out.

*motor doesn't run at all without it being connected up.
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Re: What is causing this alarm on my Honda O/B?'

Post by Divecoz » Tue Aug 04, 2020 2:09 pm

Dave if your shore power charger brings you up to full charge, you got an easy 10 starts without recharging , so IMHO bring your cell and a VHF and GO SAILING! I started My Merc 50HP 4Stk BF EFI off my motorcycle battery Just To See If It Would Do IT. Yep.

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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Tue Aug 04, 2020 4:18 pm

Thanks.

It's been running all summer with that alarm so it hasn't done any noticeable damage yet.

But my motor won't run without it in-place so it's got to go back in.

I guess I'll just leave the alarm connector off.
MacX 2000 Honda BF50A 'SeaSaw'

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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Thu Aug 06, 2020 4:01 pm

Took her out yesterday. Left the dock just fine.

Wouldn't start on way back in. Not a grunt, not a click, not a peep. I might as well have stuck the key in a potato.

I assumed I blew a fuse.

Sailed into to slip (perfect wind for it, almost rode up on boat ahead of me under power)

When I tried it again at dock, it sortta tried to kick over. Checked batteries: 11.9v and 9v.
MacX 2000 Honda BF50A 'SeaSaw'

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Re: What is causing this alarm on my Honda O/B?'

Post by DaveC426913 » Tue Aug 18, 2020 5:10 pm

Good news:

New rectifier installed. New battery (starter) has 12.5v charge. Goes up to 13.5 when I start the motor. Deep cycle battery has 13.2v charge, Does not change when I start the motor.

Bad news:

Did not fix the alarm.

The only thing left, I think, is the low oil pressure sensor.


D.
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Re: What is causing this alarm on my Honda O/B?'

Post by Tomfoolery » Wed Aug 19, 2020 4:26 am

DaveC426913 wrote:
Tue Aug 18, 2020 5:10 pm
The only thing left, I think, is the low oil pressure sensor.
Does the "oil pressure" light come on once it's running, and is it off when not running with ignition on? The oil light should be on when running, but the "temperature" light should be off.
Tom
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