INDICATOR LIGHTS - OIL PRESSURE AND GLOW PLUG (CONT)
On APU with APU engine serial number 504697 and subsequent, the glow plug
indicator is changed from a glow-type indicator to a lamp driven by a timer. This
procedure is only valid for lamp-type glow plug indicator. For glow-type glow plug
Open cover to APU control box by lifting up retainer (1) and lowering cover weldment (2).
Remove four screws (3), lockwashers (4), and access plate (5) from APU control box. Discard lockwashers.
Using APU semitrailer electrical schematic (figure FO-4) as a guide, tag and disconnect APU wiring harness leads
from two quick-disconnect terminals (6) on indicator light (7).
Remove nut (8), lockwasher (9), and indicator light (7) from access plate (5)
Remove lens (10). Remove incandescent lamp (11) and preformed packing (12) from indicator base (13).
Discard preformed packing.
4-118 Change 1