TM 9-2350-238-20-1
Step 5.
Place red probe in socket J (lead 509). Place black probe on lead 509 at
light. lf multimeter indicates no continuity, repair lead 509 from plug to
ENGINE-XMSN TEMP-PRESS warning light. Refer to page 2-371. If
multimeter indicates continuity, go to step 6. Connect wiring harness.
2-197