Signal lights

1994 CHEVROLET SILVERADO
260,000 MILES • 4.3L • 4 CYL • 2WD • AUTOMATIC
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SWEETIE1965
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The left turn signal blinks real fast. The right turn signal blinks normal. I have changed both signal light bulbs(front and back) and I have changed the circuit board. All other lights work properly as far as I can see. This has me puzzled? I can hear the flasher come on when signal is turned on. Front and rear signal blink at same time when powered on. What can cause this?
Sep 21, 2018 at 12:57 PM
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DANNY L
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Hello, I am Danny.

Quick question. Have you by chance converted any bulbs to LED?
Thanks for using 2CarPros.
Danny-
Sep 21, 2018 at 1:11 PM
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SWEETIE1965
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No, I have not converted any bulbs at all.
Sep 21, 2018 at 1:15 PM
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DANNY L
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Hello again.

Okay, on the affected side I would check all the grounds. Hope this helps and thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/how-to-check-wiring
Sep 21, 2018 at 1:48 PM
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SWEETIE1965
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I have changed front and rear signal bulb and the circuit board. I can hear the flasher come on when signal is turned on. What can be doing this? Both sides of signal lights blink together when turned on.
Sep 22, 2018 at 11:58 AM (Merged)
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STRAILER
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You are losing a ground or power somewhere. Here are the blinker wiring diagrams so you can test each circuit using the guide from above that Danny provided. Check out the diagrams (below). Please let us know what happens.

Cheers, Ken
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Sep 22, 2018 at 12:09 PM
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SWEETIE1965
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The transmission started shifting hard from first gear to second gear. All the rest shift smoothly like it always has done.
Sep 24, 2018 at 1:30 PM
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STRAILER
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Did you ever get the problem fixed?

Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
Sep 25, 2018 at 9:46 AM