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?
- notLv 71 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