Five glow plugs - but no indicator. I think there is just a switch and a relay - no automatic timer/controller/indicator. The Grand L's have a fancier setup that's nifty but not really necessary. On my rig (same engine) turning the main switch to the left runs the glow plugs - but they also run when the switch goes to start. The F2803 engine starts easy anyway - only needs a pre-run of the glow plugs in the coldest months.