When installing a remote start, do I need a relay for a negative trigger horn?

Unit is a Viper 4105v, horn output is labeled "-12 volt / 200ma"  Can I just connect this in parallel with the horn button or do I need a relay to keep it from frying the remote start unit?

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1 Answer

  • not
    Lv 7
    1 month ago

     If the horn draws more than 200ma then you need the relay. An average horn might draw 10,000ma so it's very likely in need of a relay

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