300,000 signals are potential failures
National Highway Traffic Safety Administration officials do not have a timetable for their investigation into apparently defective turn signals used in the production of more than 300,000 tractors built by the five major trucking manufacturers.
Potentially defective signals mean more than 300,000 trucks may find themselves unable to signal a lane change.
NHTSA spokesman Phil Frame said June 4 that the investigation was generated by warranty claims and replacements of a switch-pivot shoulder bolt that loosens from turn-signal use and engine vibration.
“We think about 319,000 trucks are affected,” he said. “There have been approximately 20,000 warranty claims, which is a pretty high number.”
A link between the turn-signal failure and accidents has not been established, Frame said. However, it would be hard to do so because of so many different factors in an accident, he said.
The potentially defective turn signals, made by Grote Industries of Madison, Ind., were used on trucks built since 1989 by Mack Trucks, PACCAR, Volvo-GM Heavy Truck, Freightliner and Navistar International. Together, they comprise about 90 percent of the large truck market. Continue reading