What year/make is the vehicle? Something is suspect here. If the blinkers in the rear won't work, then the ones up front won't work either because there won't be enough load on the system to cause the flasher to work. What I think, is that you probably have one of your 1157 bulbs put in wrong and it is screwing up the system in the back. In fact, if you hit the brakes, I bet the front driving lights are illuminating. Get somebody to watch.
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Related Questions
What could cause you not have blinkers or brake lights?
First, check all fuses. Then see if you are getting power to the bulbs. Then the next possibility would be the turn signal switch.
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What can cause the brake lights not to work but the turn signals do?
Could be a bad wiring harness, disruption of the circuit somewhere between the brake pedal and the brake lights, a bad switch which fails to actuate the brake lights. See sources and related links below for bulb information.
Why do the brake lights work but the tail lights and blinkers don't on a 1991 Chevy 1500?
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