Troubleshooting Hints

A check of the glow plug system should be performed before doing diagnostic procedures.

With engine below normal operating temperature, turn ignition switch to RUN, the WAIT Indicator should light. After approximately 10 seconds, the WAIT Indicator must begin to flash for an additional 10 seconds and then go out.

Turn ignition switch to OFF and then momentarily to START and return to RUN position. The WAIT Indicator should not flash for a 6.2L engine, but should flash for a 6.2L HD engine.