Dan, I hate to say this, but why set yourself up for this type of response.. If it was in your garage and you don't even know what it is or was, is it reasonable to expect anyone else might know w/o ever even seeing the object in question. At any rate, I don't think its a detonator . It's a motor (engine), whatever. Throw it away..

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Jeff Lawrence
1987 300e
1989 300e
2000 Dodge Grand Caravan SE