what wud make my blinkers work when truck is off and ignition turned to Aux. BUT when you start the engine the blinkers wont work while ignition is ON???

85

Asked by Jul 02, 2013 at 05:45 PM about the 2002 Ford F-150 King Ranch Crew Cab SB

Question type: Maintenance & Repair

Blinkers do not work while driving...BUT if you turn truck off and turn ignition to AUX. they
work just fine??

1 Answer

...well that is a puzzle, do believe that your hazards should work at any time...I should suspect undervoltage to the lighting buss because of a old battery and/or a weak connection from 1/0 battery cable to ground and back to the engine...this connection is responsible for 300 cold cranking amps needed for starting~ the under-voltage is the cause of your problem...bad battery and weak alternator and lack of 300 CCA connections is the cause~

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