TM   10-3930-638-24&P 2-28. INSTRUMENT PANEL MAINTENANCE (cont) e. Warning Lights and Diodes (cont). STEP LOCATION ITEM ACTION REMARKS CLEANING WARNING Dry cleaning solvent (P-D-680), used to clean parts is toxic and flammable. Wear protective goggles and gloves and use only in a well ventilated area. Avoid contact with skin, eyes, and clothes and don’t breathe vapors. Do not use near open flame or excessive heat and don’t smoke when using it. Failure to do so could cause serious injury. If you become dizzy while using cleaning  solvent,  get  fresh  air  immediately,  and  get  medical attention. If contact with skin or clothes is made, flush with large amounts of water. If contact with eyes is made, wash eyes with water  immediately,  and  obtain  medical  aid  immediately. 2 Electrical  connectors  and Clean Use cleaning solvent P-D-680 on terminals (1, 2, 5 and 6) connectors  and  terminals  only 3 Lens (3) Clean Use clean, dry cloth INSPECTION 4 Harness,  connector  and Inspect Replace if insulation frayed, or if light assembly wires conductors broken TESTING 5 Isolation diode (6) Test Set ohmmeter to lowest resistance range, and connect leads to terminals of diode (6). Note reading, then reverse leads and note reading. There should be one low and one high reading. Replace diode if readings are both low, both high, or identical INSTALLATION 6 Instrument panel, a. Isolation diode (6) Push on Connector (5) far right side b. Bulb (4) Install In socket (2) c. Socket (2) Position From  below  instrument  panel d. Lens (3) Position On instrument panel top e. Socket (2) and lens (3) Push together While rotating lens 1/4 turn to secure socket  (2) f. Wire leads (1) Push on Warning light terminals 2-138