extra alarm sirens

I have a 1990 prelude with a compustart 1WAM4R alarm installed. I have the stock alarm siren under my hood.

I have been looking at getting 2 pain generator sirens for inside my car, but am not sure how to hook them up. Do I just splice into my existing alarm siren wires? I will be keeping the siren under the hood for a total of 3 sirens.

My friend was saying something about a SPDT relay but neither of us have ever used one or know how to hook one up. If someone could point me in the right direction, this would help greatly.

How many wires are coming out of the pain generating sirens?

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Gary Kline
MECP Master Technician

Just 2: 1 red, and 1 black.

There are only 2 wires going to my existing siren, 1 red and 1 black

did a huge search on the forums and now im more confused,
Is the correct way to hook the extra sirens up (DEI 513t)to a realy:


87 - battery constant
86 - alarm output siren wire (+)
85 - ground
30 - Wired to all extra siren wires (+)

That should do it-

If hooked up, should all 3 alarm wirens be running off of pole #30? So Id take the red wire going to my existing alarm siren, hook that to pole #86, a fused 12v constant power supply to pole #87, ground on pole #85. then from pole 30, split the wire 3 times and run the wire to the 3 alarm sirens and then ground the siren within 18 inches of each siren?

You may as well leave the existing siren hooked up directly to the alarm module output, make some use of the internal relay output other than just a relay driver signal.
It'd add a bit of redundancy in case your added relay fails, so you'll still have some sound-
Or if it makes it tidier you can run all three off the relay, assuming the current rating of your relay will handle the three sirens without any problem.

So do I just splice the relay into the power wire going to the siren? so it would be going in and coming out of the same plug on the relay? Ive never worked with relays before, so this is pretty damn confusing. Ive worked with mostly everything else, just never a relay.

That's all, just use the existing siren output wire and tap into it to power up your extra relay.
terminals 30 and 87 are switched from what you had, but it doesn't really matter, you can do it either way. Just did it this way because that just happened to be how the drawing of my relay was arranged.

Wow, thats amazing dude. Thank you so much, this is pretty much all that I wanted, was a CLEAR diagram showing me what I have to do. At another forum I went to, everyone kept telling me to figure out how a relay works and I will figure out how to hook it up. Well I know how one works its still just confusing when youve never used a relay in your life. Thank you again, it is MUCH appreciated.

No prob, everyone has to start somewhere-