The 4 Generator is a generator-set controller. It is used on generator sets from Northern Lights, including the M864.
| Symptom | Cause | Remedy |
|---|---|---|
| Battery Will Not Charge | Loose or corroded connections, Sulfated or worn out batteries, Loose or defective alternator belt | Clean and tighten battery connections. Check specific gravity of each battery. Check electrolyte level of each battery. Adjust belt tension. Replace belt. |
| Engine Hard to Start or Will Not Start | Improper starting procedure, No fuel | |
| Entire Electrical System Does Not Function | Check DC circuit breaker, Faulty connection, Sulfated or worn out batteries | If breaker is tripped, reset it. Clean and tighten battery and harness plug connections. Check specific gravity and electrolyte level of each battery. |
| Starter Cranks Slowly | Low battery condition, Check specific gravity of each battery, Check electrolyte level of each battery, Crankcase oil too heavy, Loose or corroded connections, Battery is too small, Battery cables are too small | If low, fill cells with distilled water. Fill with oil of appropriate viscosity. Clean and tighten loose connections. |
| Starter Inoperative | Check DC circuit breaker, Loose or corroded connections, Low battery condition, Defective electrical system ground wire | If the breaker is tripped, reset it. Clean and tighten loose battery and harness plug connection. Check specific gravity of each battery. Check electrolyte level of each battery. Repair or replace. |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.