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You do not need that relay. Find a horn relay. The H310 is a 20amp normal open relay. There are several other relays you could use. Horn is the best to use as it is covered by the black cover. Therefore it seems to be protected from the weather.
Go to a junk and look at some other Mazda relays. Look at the plug side and find one the says
NO Coil
NO Coil
or could be Coil NO
Coil NO
Do not use on that says NC which is normally closed.
Might have to clean the plug end to see the letter.
If you can not find one I will send you one.
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