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#1
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BF90 overcharging...
I know there are a couple of you guys on here that eat sleep and breathe out boards...
I have a 2001 Honda bf90 that has started overcharging the battery. I'm getting 16 volts while running. Of course my first thought is voltage regulator but are there any common things I should be checking before I get into it. FYI this is a freshwater boat and always garage kept. I did just put a new battery in it but had the problem w the old one too. 
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#2
05-09-2021, 09:24 AM
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I have zero knowledge of that outboard, but being a 4 stroke, does it have an alternator?
If so, is regulator separate or built in the alternator. We are very luck to have a very good shop here that still rebuilds alternators. Mercury has had an issue with the alternators on some of their motors. I am on my second and my buddy is on his third. Last time, he took his into the shop and they just installed a new regulator on his alternator. Still ran about $125 If you have an alternator, maybe pull it off and take to a shop and see what they say Sorry, can t help more
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#3
05-09-2021, 09:45 AM
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It has the stator under the flywheel
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#5
05-09-2021, 11:05 AM
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Thx...
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#6
05-10-2021, 12:26 AM
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What happened? Did all of our outboard gurus disappear?
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#7
05-10-2021, 06:05 AM
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#8
05-10-2021, 07:54 AM
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Put a good voltmeter on the battery to double check your readings. Check your battery connections, make sure they are clean. Load test and do a voltage drop test on your battery to make sure its OK. Check your battery cables, if you have a load tester, this is easy to do, if not, feel the battery cables from one end to the other, pay attention to where it goes thru the cowl. make sure you don't have any hard spots. Japanese electrical use very fine strand wire, it works great till it gets overloaded, corroded, or old. I replace Yamaha battery cables on a regular basis. Try using a set of battery jumper cables to add current carrying capability from eth engine to the battery and see if it makes a difference. Keep in mind, the regulators are fairly crude, they generally operate in an on and off mode, where as if it needs charging, it turns the charging coils on and it goes full voltage, if it doesn't need charging, it goes off, so its common to see big swings in voltage rather than variable output like an alternator would show.
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#9
05-10-2021, 08:12 AM
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Thx guys...
Spare I'm pretty confident in my connections and battery, but will double check just in case... I did remove the ground connections on the engine to inspect last night and not a hint of corrosion under em... Last edited by smokeonthewater; 05-10-2021 at 08:48 AM.
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#10
05-10-2021, 08:31 AM
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Well connections were as I thought... perfect... no hard or crunchy spots in cables but noticed a couple wrinkles where they go through the cowl... not sure if that indicates an issue or not....
Did a load test using the trim pump.... after a few up/downs, voltage at bat during down stroke was 11.2v and voltage at engine end of cables was 11.0v.... 0.2v drop through cables sounds excessive to me... what say you? edit... measured load during down stroke is 36 amps 20210510_093641.jpg Last edited by smokeonthewater; 05-10-2021 at 09:34 AM.
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