Warning Indicators

CAUTION: Do not drive vehicle until the Brake Indicator goes out. Increased pressure on the pedal is required to stop without vacuum assistance for the brakes.

DESCRIPTION
With the Ignition Switch in "START" or "RUN", the Warning Indicators are powered through Fuse 18. With the Ignition Switch in "START", the Indicators are grounded for a bulb test.

The Brake Indicator - lights up when the Parking Brake Switch is closed (parking brake applied and Ignition Switch in "RUN"). It also lights up when either the Dual Brake Warning Switch or the Low Vacuum Warning Switch Closes.

The Dual Brake Warning Switch - closes after the brakes have been applied and either the front or rear brake system has failed.

The Low Vacuum Warning Switch - closes when manifold vacuum stays below 10 inches for more than 7 seconds.

NOTE: Diesel engines use belt-driven vacuum pumps to supply vacuum. When the engine has been off for several minutes and vacuum has bled down, the Brake Indicator comes on when the Ignition Switch is set to "RUN". The indicator stays on after the engine is starting until vacuum reaches a normal level.

The Overheat Indicator - lights up when the Overheat Warning Switch closes (coolant temperature above 247° F). When the Overheat Indicator lights up, the engine must be turned off as soon as possible to avoid engine damage.

The Fuel Water Switch - senses water in the fuel/water separator sediment bowl, the switch closes and the Water-In-Fuel Indicator goes on. Damage to fuel injection pump can result from failure to drain separator.