What is this?

[NightRunner]

Ive been trying to figure it out also. I have the same thing, with differend numbers on it, and no eiring diagrams.

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You seem to have a Silencer's Security System alarm, contact the manufacturer and reference 6904A in your email. They should be able to assist you with any questions you might have about the system.

 

[Dallas Alton]

Did you ever figure out what brand it was?? I have the same box in my 98 isuzu rodeo. Was in it when I bought it. And it wont start if I plug in the horn connector