Yamaha 225HP 4 stroke

[ausieray]

Motor has done 400 hours.
Drive shaft seal broke down and has been replaced
Current problem is electrical.
Engine charges batteries to 14.2 volts and then stops chargeing.
The voltage immediately drops to 13 and then continues to drop until the battery alarm goes off at 11.5
If the engine is turned off and restarted it charges normally and repeats the above cycle.
If , when the voltage has dropped the engine is idled and reved, the voltage will increase by 0.02 volts only. This suggests there is still some output but it is extremely small.
Is this a regulator/rectifier problem?
I do not wish to replace the reg/rectifier unit if this is not the problem
Anyone know the answer or has had similar problems?

 

[yamamarinetech40]

Re: Yamaha 225HP 4 stroke Please help!!

Re: Yamaha 225HP 4 stroke Please help!!

Have you LOAD TESTED the battery properly? Do you know how and have a load tester? If a battery has a bad cell, it will still 'show' 12 volts on a meter but won't be able to take a charge....a charger(or alternator or lighting coil, or etc. will 'see' a fully charged battery, even though it isn't any good....just a thought, have seen it more than once.

 

[JUSTINTIME]

Re: Yamaha 225HP 4 stroke

do u have a VOM VOLT/OHM METER?
not the boats, but a hand held

 

[ausieray]

Re: Yamaha 225HP 4 stroke

do u have a VOM VOLT/OHM METER?
not the boats, but a hand held

Yes.
The max voltage it charges to is 14.2 volts.when batteries are fully charged it simply stops charging.The motor continues to run ok off the batteries but the voltage continues to fall as the reg is putting out no current or voltage as far as i can tell.
The odd thing is that if you then turn the motor off and restart it it then recommences to recharge the batteries to fully charged and then repeats the cycle .
If you run the motor continuously, the battery voltage slowly falls to 11.4 volts when the alarms cut in.
there was some comment that this motor was recalled in the usa for regulatoe problems but no recall was issued in Australia. It is a 2002 model

 

[ausieray]

Re: Yamaha 225HP 4 stroke Please help!!

Re: Yamaha 225HP 4 stroke Please help!!

Have you LOAD TESTED the battery properly? Do you know how and have a load tester? If a battery has a bad cell, it will still 'show' 12 volts on a meter but won't be able to take a charge....a charger(or alternator or lighting coil, or etc. will 'see' a fully charged battery, even though it isn't any good....just a thought, have seen it more than once.

The problem is definately not battery related.
They are relitvely new and have no problem starting the boat even when the voltage has fallen to 11.5 volts.
It seems as if as soon as the regulater is satisfied the batteries are fully charge it simly shuts off completely. The motor continues to run normally until the low voltage alarms go off at 11.4 volts.
If i then turn the motor off and restart it it starts to chare the batteries up again untill they are fully charged and then simpy stops chargeing again
Trust this explains the problem more clearly
Ray

 

[JUSTINTIME]

Re: Yamaha 225HP 4 stroke

i asked do you have a hand held VOM volt meter?
i can tell u how to test the regulator in one simple test, 1 10 second test

 

[ausieray]

Re: Yamaha 225HP 4 stroke

i asked do you have a hand held VOM volt meter?
i can tell u how to test the regulator in one simple test, 1 10 second test

Yes I do have a hand held VOM meter. That's how I've been checking the voltage. Would be very interested in how to test the regulator! It could save me from towing the boat 800 km round trip!
Thanks

 

[JUSTINTIME]

Re: Yamaha 225HP 4 stroke

easy

turn your VOM to a/c volts
start the motor, put the leads on the battery
if u get over .8 a/c volts ur regulator is bad

 

[wildman07]

Re: Yamaha 225HP 4 stroke Please help!!

Re: Yamaha 225HP 4 stroke Please help!!

Motor has done 400 hours.
Drive shaft seal broke down and has been replaced
Current problem is electrical.
Engine charges batteries to 14.2 volts and then stops chargeing.
The voltage immediately drops to 13 and then continues to drop until the battery alarm goes off at 11.5
If the engine is turned off and restarted it charges normally and repeats the above cycle.
If , when the voltage has dropped the engine is idled and reved, the voltage will increase by 0.02 volts only. This suggests there is still some output but it is extremely small.
Is this a regulator/rectifier problem?
I do not wish to replace the reg/rectifier unit if this is not the problem
Anyone know the answer or has had similar problems?

Morning Aussiray,....I'm having the same problem with my F200 .I know yours is a 225hp but the engines are pretty much the same other than the HP.I will certianly keep you posted,when and if I get this thing worked out.I'm in a similar situation,I'm in the out Islands of the Bahamas an are called the Exuma Islands.Far far away from help.Hope we can get these engines repaired. Wildman.

 

[JUSTINTIME]

Re: Yamaha 225HP 4 stroke

Wildman
check your IM

 

[rodbolt]

Re: Yamaha 225HP 4 stroke

not knowing the specifics to motors shipped for the international market all I can say is the US F200's and F225's in a particular year range had a recall involving the regulator rectifier and driver circuits. the old had gray driver connectors the updated has blue.
to test the regulator is fairly simple. but it does require the service manual as well as a few test adapters.
its a 3 phase altenator that feeds the 3 sine waves into a rectifier regulator. first make sure all three phases are present, if the loaded AC voltage from the stator is in spec and the DC output is not odds are very high either the regulator is bad,the driver is bad or the ground is bad.
the update was actually for battery overcharging.