On the matter of the horn and lights: A Dynamo is just another type of generator to produce electric current. The voltage will vary with the load. If you severely overload any type of generator then the voltage will start to drop. The more severe the overload is, the deeper the voltage drop will be. A battery that has bad cells can short out internally, and I have even seen batteries that are allowed to discharge so deeply that the polarity will reverse in a single cell of in the entire battery. That can sometimes cause the battery to explode, but it would definitely present a heavy overload to your generator. Now another principal also comes into play... Electricity always follows the path of least resistance. If you battery has an internally shorted cell, or a polarity reversal, then it is going to be the absolute least resistance anywhere in the system. As long as that load is there you won't get enough extra electricity to operate the coil in a horn or to light the filament in a bulb because it's all flowing through the battery.
Kubota B6100 Dynamo
- Thread starter Matt S
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banjodunn
Veteran Member
G'day Matt the tests are the same as an alternator you basically want to hook a multi meter up to the battery and check to see what sort of voltage you have got anything over 12.5v with the engine at about 1200rpm is good, seeing it is a generator it is not often that you see alot of charge under this eng speed. Best of luck with it
Jon
Jon
Egon
Epic Contributor
It's actually an alternator isn't it??
David_Kb7uns
Veteran Member
No they are different, a dynamo has rotating magnets inside a fixed winding and puts out ac, an alternator has a rotating field that is inside the winding(s) with ac output rectified internally and a generator has a fixed field winding with rotating windings inside that make dc current transfered through the brushes.
David Kb7uns
David Kb7uns
Egon
Epic Contributor
ok.
banjodunn
Veteran Member
G'day good explanation Dave but a generator/ dynamo actually puts out DC not AC and this is why for their size they don't have as greater output as an alternator. OOOPS sorry i just read the end again and realised you did put dc and not ac my apologies
Jon
Jon