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Thread: Mystery part under dash

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    Default Mystery part under dash

    Curious if anyone knows the use of this part.


    It was mounted under the dash although it was not hooked up to anything. Only thing readable on the unit is Pentatech Inc. Car had original radio installed and nothing out of the ordinary. Red/Yellow/black ground, makes me think radio attachment of some sort, but iono. Dash lights dont work in car, maybe this was some type of relay or something at one time to bypass the dash light rheostat switch? Just curious, maybe someone has seen one before, looks pretty old school. Thanks.

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    Not enough Zs yet! nwcubsman's Avatar
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    I think that Pentatech used to make alarms. But I was never an installer.
    Bryan
    ___________________________________________
    12/72 240Z, HLS30139612
    2/73 240Z, HLS30149546
    IZCC #14892

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    Fired Up! JLPurcell's Avatar
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    CIA Tracking device? or could be FBI.
    Jerry Purcell
    1970 HLS30 00029 Owner since 1976 Now owned by Les Canaday (Classic Datsun Motorsports)
    1972 HLS30 93606 IZCC Registion #105 Original owner back home after full restoration by Classic Datsun Motorsports

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    HS130-150591 4/79 zbane's Avatar
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    Throw it away and it'll be a Pentagone.
    David
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    HS130-150591, April, 1979-280zx
    2001 Infiniti I 30

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    This is a wild guess, but there was a company by that name that made car alarms. Drive it like you stole it!!
    Last edited by geezer; 01-26-2007 at 07:09 PM.

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    Registered User troubledz's Avatar
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    There watching you.. get rid of it...
    72 240 Z
    76 280 Z
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    65 AC Cobra
    65 Ford E100
    daily driver?

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    Old style Lights-On alarm?

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    Any idea of what the basic wiring set up was for these old "kill switch's". Now Im starting to think thats what it was, thanks to the heads up on this brand making them. Only thing out of the ordinarry that I could see was a wire coming off the ignition switch. Guess it could of been wired from that ignition wire to the rheostat and acting as a simple relay. Ill get under there next weekend and do some testing, but that sure would be nice to eliminate my "no dash" light problem and put to rest what this lil bugger was doing up under there.

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    Crack it open and lets have a look inside.

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    A bit tough to decifer from the picture, but I'll venture a guess. It could be a normally closed relay which could be used to flash the lights and pulse the horn relay. The black wire with the aligator clip was probably used to arm it. Try feeding it a fused power supply and also, do a continuity test. It looks to be a pretty simple device. Any one else?

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    I can elaborate some, if you want to test out my theory. With your 12V feed (fused), connect to the red wire, connect the yellow to a test light and ground the test light. The light should turn on (and I suspect pulsate). You can instead, just check for continuity from the yellow & red wire. Now ground the black wire and the light should turn off. The black wire is supplying a ground to the control side of the relay which in turn when connected will not allow continuity to the yellow wire. The yellow wire then can be used to control the 12V control side of another relay, or supply 12V to anything when the aligator clip is removed. This device probable has another feature built in to create a 12V pulse. Have fun!

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    Fun fun, finding wierd stuff stashed away. Sorry about the bad picture, I tried to throw something up before going to work. The ground wire (alligator clip) is connected to a spool of wire on a very thin wire. yellow is to a "capacitor" type module, red is to the top framing of the unit which does overlay the ground side with a gap there (instant motion detector thoughts come to mind). Im guessing its a motion detector type of unit by my novice guess. Just a little curious if this really indeed was once wired to the interior lights. Blah, too much work lately, must sleep and return to work. Ill read your thoughts more thouroughly after work tonight geezer, thanks.

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    You could be right on both counts. I have designed and built some custom units. Everything from motion detection, RF signaling devices to a current silent system that will automatically call a list of predetermined cell or phone numbers. The one you have there, seems to be someone's homemade (adapted) version of whatever they had in mind. Normally, the unit you have found, would not have an aligator clip on it, but instead, would have been routed through a simple hidden toggle switch and ultimately connected to a door (or more than 1 door) switch. Anyone opening the door before disarming the ground signal with the toggle switch would set off the alarm. The "capacitor" type module you found going to the yellow wire...is it 2 legged? Of course, I haven't seen or tested this thing so don't put too much stock in what I've said.

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