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Q: Its' turn signals work sometimes and sometimes not. on 2003 Oldsmobile Alero

The turn signal seems to work fine, then not at all temporarily. But lately is not working more of the time than not.
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You could have a defective hazard module assembly, which includes the flasher circuit. Proper testing is in order to follow step by step so that you replace the right parts, or repair a wiring issue.

Good luck!
I had heard this from another person. He said if it's not the fuses to maybe spray the signal switch with an electrical cleaning spray.
The conection between the hazard and turn signal was the problem with mine and pushing the hazard button once or twice would fix it for a short while till it did it again but to get it to stop completely it will have to be taken to quilified shop and fixed
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