How to determine whether hazard switch or relay is bad - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 06-10-2019, 06:25 PM Thread Starter
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How to determine whether hazard switch or relay is bad

Hi All,

I have a Euro 1985 500 SEC. I just purchased the car and am trying to get it inspected but the emergency flashers are not working. The blinkers all work when activated by the stalk. If I press the button to turn the hazards on, the blinkers will no longer work with the stalk. If I turn emergency hazard switch off, the blinkers work just fine again when activated by the turn signal stalk. Can either the hazard switch or the relay be deemed good or bad with this information?
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post #2 of 6 (permalink) Old 06-10-2019, 07:37 PM
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Originally Posted by dinguskahn View Post
Hi All,

I have a Euro 1985 500 SEC. I just purchased the car and am trying to get it inspected but the emergency flashers are not working. The blinkers all work when activated by the stalk. If I press the button to turn the hazards on, the blinkers will no longer work with the stalk. If I turn emergency hazard switch off, the blinkers work just fine again when activated by the turn signal stalk. Can either the hazard switch or the relay be deemed good or bad with this information?
I would clean or replace hazard switch. You may get lucky if you turn switch on and off about 10-15 times rapidly probably corrosion buildup inside of hazard switch.
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post #3 of 6 (permalink) Old 06-10-2019, 08:07 PM Thread Starter
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I took it apart and rubbed all the contact points with an abrasive pad until they were shiny. No change in how it operates other than above.

Can I conclude the relay is good if the blinkers work? Is it definitely the switch knowing the above situation? Just trying not to throw parts at it if I can avoid it.
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post #4 of 6 (permalink) Old 06-10-2019, 09:14 PM
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Test the switch electrically with a multi meter first.

I would not exclude the relay given your description.
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post #5 of 6 (permalink) Old 06-10-2019, 11:31 PM
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Pull the hazard switch out and hit it with some contact cleaner spray.
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post #6 of 6 (permalink) Old 06-11-2019, 05:03 AM
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Originally Posted by dinguskahn View Post
I took it apart and rubbed all the contact points with an abrasive pad until they were shiny. No change in how it operates other than above.

Can I conclude the relay is good if the blinkers work? Is it definitely the switch knowing the above situation? Just trying not to throw parts at it if I can avoid it.
I believe the the turn signals and the hazard switch share the same circuit.

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Originally Posted by SD_GR View Post
Test the switch electrically with a multi meter first.
I would not exclude the relay given your description.
^^ What he says above. Check continuity of the switch with a multi meter, that way you’ll know if the switch is faulty.
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