Document EvELd2qRp9GyDzRzaD2b3bYVn

BULLETIN DECEMBER 7, 1976 No. Q90 under brakes FOR BRANCHES. DISTRIBUTORS AND CUSTOMERS. CHASSIS AFFECTED ALLENTOWNS^HAYWARD^OAKVILLE ANTI-WHEEL LOCK WARNING UNIT (All Vehicles with Anti-Wheel Lock Brake Systems) PURPOSE To advise that the warning unit can be damaged by short circuiting or grounding'either the warning unit or anti-lock warning light circuit. RE COMMENDATION Avoid grounding or short circuiting the warning unit oi warning light circuit when trouble shooting this equipment. Always use a voltmeter to determine if voltage exists at any point in the system. i PLAINTIFF'S EXHIBIT INFORMATION Permanent damage to the warning unit can occur lithe terminals are grounded or "shorted" while the unit is powered Damage can also occur if a test light or screwdriver is used to check for voltage at the warning light by shorting to the side of the bulb socket. 'Shorts" or grounds of this nature will cause failure af the warning units Internal components (transistors, diodes, etc.) and render it Incapable of Indicating a failure in the anti-wheel lock system. *4-v MAC-72 CIRCULATION Service Manager -f' Shop Foreman Night Foreman Night Foreman Inspector Leadman Inspector Leadman Inspector Leadman Unit Over haul Room HINTED IN U J > . Service Operations, Allentown, Pa. U.S.A. Shop Office Mack