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Need to add a Buzzer

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Old Jul 17, 2010 | 08:07 PM
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Default Need to add a Buzzer

Does anybody know how I would add a buzzer to my e-brake. I bought a buzzer and was going to hook it up to the switch on the e-brake but when I used a meter I realized that it gets power only when the brakes are off. When the brake is engaged, it doesn't have power which would mean that it would only buzz when the brake isn't engage. I could use the power going to the light in the dash but not sure how.

Can anyone help me?
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Old Jul 18, 2010 | 09:52 PM
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Does anybody know how I can get to the wire that leads from the brake light in the instrument cluster? Or maybe a wiring diagram?
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Old Jul 19, 2010 | 12:17 AM
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What kind of buzzer is it? Couldn't you just get some key power and run it to the green/red wire to the switch? That way, it would buzz anytime the key is turned on with the park brake on. You may need to put a diode in the line to the light (opposite the switch) so the power from the buzzer won't feed back into it. Have the buzzer ground through the park brake switch.

Last edited by rtg143; Jul 19, 2010 at 12:21 AM. Reason: diode info.
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Old Jul 19, 2010 | 06:25 AM
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Why do you need another buzzer ?? I just got rid of the seatbelt chime..lol
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Old Jul 19, 2010 | 06:33 AM
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I don't have my Ford factory schematics with me here at work, but I'd guess that when the e-brake is applied, the switch at the e-brake provides ground, and not power. This is how most switches work. Use your meter to verify.

Then, run power to the buzzer, and ground from the e-brake switch. Buzzer will only work when e-brake is applied.
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Old Jul 19, 2010 | 09:30 AM
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The powered wire is light green/red, the switch grounds that to the black wire.

From what you're saying, the switch is normally closed (circuit is grounded) with the brake off, and you push it open with the brake. In that case, grab a standard automotive relay, and wire it so the power from the brake holds it off, and when the brake is depressed (voltage stops) it fails to on.
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Old Jul 19, 2010 | 08:52 PM
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Great, I'll give that a shot. Thanks
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