TM 9-2350-238-20-1
Step 3.
Disconnect lead 19 and lead 520 from BO-IR switch. Connect multimeter
between connector 19 and 520 on switch. If multimeter indicates 0 ohms,
repair lead 520 between BO-IR switch and vehicular light switch. Refer to
page 2-371. If multimeter indicates infinity, replace BO-IR switch. Refer to
page 2-566. Connect leads.
AL. BLACKOUT DRIVE HEADLAMP CIRCUIT (HEADLAMP ASSEMBLY).
2-247