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Old 11-03-2007, 09:02 AM
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Headlight Warning Chime

While researching adding a headlight warning chime to my '55 Chevy
I came across this suggestion on a Nash Metropolitan web sight. It
sounds SO easy, but I'm not smart enough on electrics to figure
out if it is feasible. I'm guessing the "S&T" terminal is the START terminal?

This is a GREAT TIP for those of you that have gone for a nice ride in your Met just around dusk. You have your parking lights on then you get to where you are going and you forget to turn the lights off. Here is a simple and cheap way to install a headlight chime to remind you to turn off those battery-draining lights.

Go to Radio Shack and purchase a 12V chime or buzzer.
(the buzzer is only about $3 or $4, the chime is $9.99 but the chime sounds better!). There will be 3 wires.
Twist the red and white wires together and
install a crimp on the pair and a crimp on the black wire.

On a NEG. GROUND CAR: Attach the red/white
combo wire to the S & T terminal
and the black wire to the IG terminal on your ignition switch.

On a POSITIVE GROUND CAR: just reverse the wiring as described above.

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Old 11-03-2007, 10:28 AM
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I would think that the s&t would refer to the stop & tail light fuse in the fuse panel. I think with the key on/lights on there would be no voltage difference in the chime. With the key off and lights on there would be voltage from the light circuit making the chime do it's thing. I am not an electronics expert nor do I play one on TV, but this is my thoughts. Seems like it should have a ground somewhere..but what do I know? Maybe the IG terminal grounds when it is off.
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Old 11-03-2007, 11:35 AM
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Bob, I think you are correct on the S&T question. I just checked my '55 and
the ignition circuit is a ground when off. It makes sense now. I would still add
a diode between the + lamp circuit and the chime or buzzer.

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Old 11-03-2007, 01:26 PM
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I put one on a 66 pontiac years ago and I think I went from the taillight switch through the chime, then to the radio fuse. When the switch was on, both sides got 12v so no potential. With the switch off, if the lights were on the accessory side of the panel had enough continuity to ground to operate the tiny load in the chime.

I think thats how I did it.
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