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starter/alternator or generator

G

gdtractor

Member
Not sure this is the place to ask but it looked best,, :)

I have a side by side with a GX390 Honda engine ..
I am not sure I have an old or inefficient battery or a bad starter (if it has a generator in it)

I am assuming since it is electric start ... something has to RECHARGE the battery ... the starter?

So .... is the starter on a Honda GX390 a generator for the battery too?
 
As Fawteen indicates. The charging electricity comes from a alternator type device built into the area usually inside the rim of the flywheel. a stator (Stationary coils of wire) has flywheel magnets pass by creating AC voltage. The AC is turned into charging DC using diodes and solid state components to charge the battery, and produce lighting/accessory power. There are generators that have been used as starters with special wiring inside them (IH used them on Cub Cadets and other small tractors) but none use a starter as a generator. Motor design is much different than alternator design. One stunning exception is rail road engines that can use sophisticated electronics and massive power storage to drive their huge generator into being a motor to start the 16 cylinder diesel. the link shows the starter for that engine, it is clearly starting only. Jim
starter for that honda
 
As said, it has charge coils under the flywheel.

If you have a volt meter, put it across the battery. A fully charged battery will have about 12 1/2 volts. If low, or the voltage drops to near 0 when cranking, you have a discharged or bad battery.

Try charging it, get it started. With it running and the engine revved up (the charger removed) the voltage should show an increase, probably not much as the charge system is minimal, but it should show an increase from idle or not running.

If it won't charge, the battery is bad.

If it charges, but still no crank, there is a bad connection or a bad starter.
 
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