charging question

[richie66]

I have a 1996 yamaha 30 hp. mlhu model how do I know if this motor has a lighting coil there are green wires dangling from a harness coming from above under the flywheel waiting for hookup of rectifier? I would like to be able to charge my batteries if I buy the rectifier will that enable me to do this thank you any help would be appreciated.

[Livinlinelife]

If u have a stator assembly the lightning coil is a part of it.
U should be able to check AC voltage on those dangling wires while the motor is running.
But be carful, where gloves and stay clear of the flywheel.
The safe way is the best way.

[Livinlinelife]

If u are generating ac current then yes a rectifier will convert to dc and enable u to charge.

[richie66]

thanks for the reply what stops the battery voltage from back feeding the rectifier and possible damage or does it matter. Is this a regulator rectifier or a shunt rectifier I just do not want to damage any components. Again thanks for the reply.

[rodbolt17]

its a full wave bridge rectifier.

[richie66]

does that mean it will prevent current back flow sorry if I seem needy.

[rodbolt17]

full wave bridge rectifier ONLY allows current in ONE direction.
methinks your not real good at basic electronics are you ?
no such thing as a shunt rectifier.
there is a regulator/rectifier that does shunt.

don't worry we can badger you until you understand

[99yam40]

thanks for the reply what stops the battery voltage from back feeding the rectifier and possible damage or does it matter. Is this a regulator rectifier or a shunt rectifier I just do not want to damage any components again thanks for the reply.

full wave means 4 diodes so they block back feed
Seems like you have done something to damage some parts in the past from what you posted, is this true?

bad connections can cause problems

[rodbolt17]

and whats it called if only TWO diodes are used ????

[richie66]

Thanks rod bolt it's funny you say that I happen to be a electrical contractor but know very little electronics. and no yammy I have not damaged any components but have grown wise enough to know outboards are expensive and times are tough so I just want to make sure I do not damage anything. this has me very excited because I thought I would have to get a generator onboard to charge my battery I have just finished a tiller to remote conversion and this is a manuel start motor but it seems it has all the possible hookups I need.

[99yam40]

I always thought it was a half way bridge

[richie66]

half wave rectifier.thank you very much for the info.

[boscoe99]

Well now that we bring it up, the regulator in a permanent magnet generator (Yamaha type) is a shunt type device insofar as it shunts current to ground to control the voltage. The generator is making all of the current of which it is capable at whatever RPM it is operating at. If current is not needed then it is shunted to ground and wasted in the form of heat. Thus the cooling fins or water cooling device on certain Yamaha regulators.

The voltage regulator in a belt or gear driven generator (aka alternator for Rodbolts truck) on the other hand uses the regulator to control the amount of current that flows through the field windings. It only provides the current that is necessary to produce whatever the set point voltage of the regulator happens to be.

[richie66]

The important thing to me is that I can now proceed with my project thanks guys.

[99yam40]

the small motors only put out a small amount (6 amps) at high RPMs,and very little at low RPMs
So make sure the battery is fully charged when you start out and do not hook up too much power using devices to it