adding sirens

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go to kragens or autozone. look for a 30 amp relay. there should be a diagram on the back of the item that shows you how to hook up your accessories

 
I was told that in order to add sirens, I need to use relays. Can anyone help me on this?

The usual rule is: more than 3, use a relay.

Most alarms can handle 3 sirens from the output of the control module. Just wire them in parallel.

* I run 4 without a relay and works fine.

 
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the 87pin is th input from the alarm(brown wire), 85=12volts, 86=ground, 30=extra sirens. better to be safe than sorry and burn out the alarm. different brands work different ways.

 
thanks for the input, i will use a relay to be safe, but im confused about the diagram because it says 85 is 12volts and it shows on the diagram that it is ground, shows 86 as ground and on the diagram that is the remote turnon,

 
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