Instructables

A Vehicle Backing Alarm With a Self-Reseting Disable Button

At one point I was in charge of maintaining the safety of a fleet of large, unwieldy vehicles. I thought that putting backing alarms on the trucks would increase everyone's safety during maneuvering in the parking lot, but I hated that darn beeping!

I considered having a simple switch to turn the alarms off, but I was pretty sure that no one would ever remember to turn them back on.

To solve this problem, I created a system where (as usual) the alarm begins sounding when the vehicle is placed into reverse, but there is a disable button installed on the dashboard. The operator can press the button to silence the alarm, however the system will reset once the vehicle is taken out of reverse, so that the alarm will sound again the next time the vehicle is shifted into reverse.

The system requires a bit more work to install than a standard backing alarm, but it's a small price to pay for maintaining pedestrian safety, my sanity, and the gratitude of our neighbors.
 
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Step 1: Gather your Materials

This is a pretty simple project. You will need:

~ some wire
~ a momentary push-button switch (normally open)
~ a Single Pole Double Throw (SPDT) relay
~ a backing alarm
~ some electrical tape, liquid tape, or other all-weather insulator (remember, parts of this are going to be under a truck!)
~ some cable (i.e. "zip") ties couldn't hurt

You'll also need a drill to create a hole in the dashboard for your switch, and you may need trim tools, screwdrivers and whatever else it takes to get behind the panels in your particular vehicle.