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Hazard Warning Circuit Test

  1. Remove hazard warning switch. See HAZARD WARNING SWITCH  under REMOVAL & INSTALLATION. Using a DVOM, check for voltage between terminal No. 8 and ground. See Figure. If battery voltage is present, go to next step. If battery voltage is not present, check HAZ-HORN fuse and wiring between fuse and switch.
  2. Check for voltage between terminal No. 10 and ground. With ignition switch in LOCK or ACC position, voltage should not be present. If voltage is not present, go to next step. If voltage is present, check for short to power. See WIRING DIAGRAMS article in WIRING DIAGRAMS section.
  3. Turn ignition on. If battery voltage is present, go to next step. If voltage is not present, check TURN fuse and wiring between ignition switch and hazard warning switch. See appropriate chassis WIRING DIAGRAMS article in WIRING DIAGRAMS section.
  4. Check for voltage between terminal No. 2 and ground. With headlight switch in OFF position, no voltage should be present. If voltage is present, check for short to power. Turn headlight switch to TAIL or HEAD position. If battery voltage is present, go to next step. If voltage is not present, check wiring between headlight switch and hazard warning switch.
  5. Check for continuity between ground and terminals No. 3, 5 and 6. Terminals No. 5 and 6 will have slight resistance as they are grounded through bulbs. If continuity does not exist on any wire, check wiring. See appropriate WIRING DIAGRAMS article in WIRING DIAGRAMS section.
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