04-13-2015, 05:03 AM
"Basic Chinese model engine and alternator"... What method is utilized for idle control? Tension spring or an electronic ignition/engine speed (diesel version) sensor and servo based idle controller? If spring tension controlled, they tend to succumb to the elements (rust) out here and lose tension and bring the idle speed to generate below voltage when under load. A new spring set will typically solve the issue otherwise... it's may be in the servo or sensor circuit or something else.