These are 6-volt heaters (operated at 12 volts) that turn ON, when the ignition switch is turned to the run position, prior to starting the engine. The 6-volt heaters remain pulsating for a short time after starting, and are then turned OFF.

A Wait to Start lamp, which is on the instrument panel, provides information pertaining to the engine starting conditions. The Wait to Start lamp will not come ON during the post glows.