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General question about evo one . Horn out put is a neg trigger. I have a siren that has a pos and neg wires .

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The evo one has a neg output for siren or horn no relay is needed the question is the siren has a neg wire to chassis ground and pos wire to 12 volt . Can it be wired up like this. Siren pos to 12 volt and neg chassis ground to neg trigger on the evo one . Is this possible or will that wiring burn up the evo one. Or should i use a relay to change the ouput to a pos trigger and power it through a relay with the evo one neg trigger
asked Feb 26, 2018 in Kia by jeff panotes (590 points)

2 Answers

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That will work fine, put 12v constant on the red (positive) wire of the siren, and hook up the black (negative) wire of the siren to the siren/horn output of the evo-one, this is a 2A output. You can only do this on the evo-one, if using an evo-all, a relay will be required as the output on the evo-all is not rated the same as the Evo-One.


Thank you,
answered Feb 26, 2018 by Rico (54,260 points)
0 votes
the negative output is rated 2A on the evo-one.  Good to go on any siren that are approx. 20W.


unrelated but, In cases where you are not using the white wire from the main harness, option 12.2 or 12.3 would enable (+)siren out on that wire.
answered Feb 26, 2018 by Robb (239,720 points)