Question about 2001 GMC W3500

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With turn signal on push brake pedal both flash also with signal on ,turn on lights and flashes fast as if burnt out. relay or flasher?

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Check all the earth straps it sound 1 or 2 of them of loose, rusty, or broken.
Because the current has to run all through the car, so if a break or a fault happens. The current with find a earth point and overload it, which in turn send's current back to conponents and starts to short them out, like your's is doing.
I hope this as helped??

Posted on Jul 29, 2009

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Start by checking to make sure you have the correct size bulbs installed. If they are correct then replace the flasher relay. It is located Front seating area, driver side, under dash, mounted on top of brake pedal. If that does not cure the fast flashing, you may have a bad ground connection or the turn signal combination switch may be bad.

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