Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Is battery voltage at least 12.5 volts? Is the charging system working? With engine running, is voltage at battery above 13 volts?
No battery on the unit?
When you replaced the alternator, were the magnets in the flywheel good> No cracks, and not loose?
Did you see my responses?
We try to help! Without basic knowledge of what you have, we have to ask questions. You may not know all the answers, but it could help in the diagnosis. Your output from the regulator/rectifier has to be above battery voltage, the alternator(stator) under the flywheel is where it all starts, it has to have good magnets and can't be broken or damaged, and tight on the flywheel. It should produce a minimum of 28 volts AC where engine is running, for the rectifier to produce 14 volts DC, to work the clutch or charge a battery.