NHTSA Campaign Id 74V227000; Date: Nov. 21, 1974
1973 Mack DM; 1974 Mack DM; 1973 Mack R; 1974 Mack R; 1973 Mack RD; 1974 Mack RD; 1973 Mack U; 1974 Mack U
Component: Exterior Lighting:headlights:switch
Manufactured by: Mack Trucks, Incorporated
Affected Units:: 1,023
Mack campaign no 55. Mfg'd Jan. 1, 1973 thru Aug. 14, 1974. Possibilitythat vehicles equipped with a tractor protection valve an interference couldoccur between the stop lamp switch and the head lamp switch could create ashort circuit that would interrupt head lamp operation. (correct by inspectingand providing additional clearance between switches where necessary).
Date Owners notified by Manufacturer: Feb 7, 1975
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