Originally Posted by dieselclacker
Dave, the reason for recycling the pre-heat system for the engine is to re-set it to cycle on again. Most if not all pre-heat system have a timed cycle, (when the light goes off, engage the starter). By recycling it a couple of times without engaging the starter, warmer air is produced for the engine to start on.
On my CAT C7 I can actually hear the grid heater come on when I cycle the ignition key. And yes, it comes on more than once if you cycle the key. Just watch your battery gauge.
Dirk - When I owned my Cummins 5.9 ISB, it too would cycle more than once even after the engine started. Again, watch your battery gauge.
On edit, yes, there is a temperature sensor in the system which if the ambient temperature is warm outside precludes the grid heater from coming on. Not needed.
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX