Indicator Warning Lights

Oil Pressure

If lamp does not come on with ignition on and engine not running, check for burned out bulb, lamp circuit open, or defective sending unit. If lamp remains on when engine is running above idle speed, check for grounded wire between bulb and sending unit, defective sending unit, or low oil pressure.

Coolant Temperature

If "HOT" indicator fails to light when cranking engine, check for burned out bulb, open lamp circuit, or defective ignition switch. If indicator lamp remains on with engine running, check for ground in wire between bulb and sending unit, defective sending unit or ignition switch, or excessive coolant temperature.

Alternator Indicator

If lamp remains on when ignition is off, check for shorted alternator positive diode. If lamp remains off when ignition is on, but engine is not running, check for burned out indicator bulb, open lamp circuit, or an open in alternator field. If lamp comes on with engine running above idle RPM, check alternator output, check for shorted alternator negative diode. Check for loose or broken alternator belt.