Home›Controllers›DC Logic System

DC Logic System Controller

The DC Logic System is a generator-set controller. It is used on generator sets from Northern Lights, including the M20C, M33, M673 and M843JK.

Generator sets

Northern Lights

Brand

5–16 kW

Power range

Fuel types

Generator sets using this controller

Northern Lights M20C Northern Lights M33 Northern Lights M673 Northern Lights M843JK Northern Lights M843N Northern Lights M844

Engines paired with this controller

Caterpillar C18-C Northern Lights 843J Northern Lights 843N Northern Lights 844 / 844L Northern Lights 844L Northern Lights 844W2 / 844LW2 Northern Lights L673L Engine Northern Lights Lugger

Troubleshooting

Symptoms & remedies

Symptom	Cause	Remedy
Battery Will Not Charge	Loose or corroded connections	Clean and tighten battery connections.
Battery will not charge	Loose or corroded connections	Clean and tighten battery connections
Below Normal Engine Temperature	Thermostat not working properly	Check thermostat.
Engine Emits Black or Gray Exhaust Smoke	Clogged or dirty air cleaner	Service air cleaner.
Engine Emits White Smoke	Improper fuel	Use correct fuel for temperature.
Engine Hard to Start or Will Not Start	Improper starting procedure	See starting section of this manual. Take special note of Bypass Switch operation.
Engine Knocks	Insufficient oil	Call your dealer.
Engine Malfunctions at High Output Range	Fuel supply insufficient	Air in fuel system or clogged fuel filter element.
Engine Overheats	Low coolant level	Fill tank or radiator to proper level; Check hoses for loose connections and leaks.
Engine Runs Irregularly or Stalls Frequently	Below normal engine temperature	Remove and check thermostat.
Engine hard to start or will not start	Improper starting procedure	See starting section of this manual. Take special note of Bypass Switch operation
Engine runs irregularly or stalls frequently	Below normal engine temperature	Remove and check thermostat
Entire Electrical System Does Not Function	Check DC circuit breaker	If breaker is tripped, reset it.
Entire electrical system does not function	Check DC circuit breaker	If breaker is tripped, reset it
High Fuel Consumption	Improper type of fuel	Use correct fuel for temperature.
High Oil Consumption	Break-in period	Oil consumption decreases after break in.
Lack of Engine Power	Intake air restriction	Service air cleaner.
Lack of engine power	Engine overloaded	Reduce load
Low Oil Pressure	Low oil level	Fill crankcase to proper level.
Starter Cranks Slowly	Low battery output	Battery is too small; Battery cables are too small.
Starter Inoperative	Check DC circuit breaker	If the breaker is tripped, reset it.
Starter cranks slowly	Low battery output: Batteries too small; Battery cables too small	Check specific gravity of each battery; Replace battery if necessary
Starter inoperative	Check DC circuit breaker	If the breaker is tripped, reset it

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.