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August 1, 2015 Service bulletin

Western star: brake signal overrides turn signal under normal operations, due to turn signal switches and...

Western Star technical service bulletin SB-54-1 for 2016 Western Star 4900, 2016 Western Star 4700 and 2015 Western Star 5700 and others.

Bulletin number
SB-54-1
Component
Exterior lighting: turn signal: switch
Summary
Western star: brake signal overrides turn signal under normal operations, due to turn signal switches and stop/turn lamps are sharing same filament and some trucks want 4 way flashers to override self cancelling turn signal switches. No model years listed. Constellation, heritage, 4700, 4800, 4900, 5700, 5900, 6900.

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