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Jeep Wrangler - Restoration & Custom Outfitting
All photos, diagrams, and text on this page Copyright 2013 - David Todeschini - all rights reserved - see Copyright Terms

 

Turn Signal Beeper

 

All of us who drive our Jeeps with the Top down on the open road have left our turn signals on at some time or another not because we're 97 year-old duffers who are hard of hearing, but because the road noise masks the feeble "click" the turn signal module makes. Leaving a turn signal flashing well after you've made a turn or (more commonly) after making a lane change, is frustrating to drivers behind you, and is likely to get your other signals ignored by other drivers as well, which is dangerous. When you are not using it and don't want to hear the Turn Signal beep, the circuit provides a switch to turn it off.

 

As someone who has driven almost 2 million miles without an collision or ticket, I can tell you that this has happened to me more than once since I started driving my Jeep (because of road noise), and I observe it in other drivers (in any vehicle) almost every day. You can avoid leaving your signals on longer than you need them, if you have an audible signal that you can hear over the road noise, and over any music or radio programs you may be listening to. The circuit in the diagrams below can be used by itself, with the components mounted in a small plastic project box (that you can get from Radio Shack), or you can simply add this circuit to the circuit of the Turn Signal Monitor Box.

 

If you don't have a trailer connector (J1), you can purchase one: Hopkins 48215 60" 4Wire Flat Connector (48035 + 48115). The link gets you what you need to install the connections you need for a trailer, and component labeled 'J1' in the diagrams below.

 

HOW IT WORKS: The circuit detects a turn signal by using a Bridge Rectifier (BR1) to apply voltage to a Piezo beeper whenever either bulb is "on" and the other "off". Resistors R1 and R2 provide a path to ground () whether your particular flasher unit opens the circuit to the bulb being flashed, or connects the associated lead to ground (). This circuit will work in ANY vehicle with ANY signal flasher module, whether it is an LED module, or an older incandescent lamp module.

 

Resistors R1 and R2 provide a path to ground () when there is no positive (+) voltage applied to the Signal Lamp (turn signal off). When either Left or Right Turn Signals are activated, one of the wires on the Bridge Rectifier (marked (~) has a path to ground via the resistors, and the other wire is energized with +12 Volts. The Bridge Rectifier (BR1) ensures that 12 Volts is supplied in the proper polarity to the Piezo Beeper (PZ1).

 

When brakes are applied, both yellow and green leads will be (+) which will cause the beeper to be silent, but the turn signal being activated will turn cycle of the bulbs off {the flasher will either open the circuit, or switch the associated wire to ground ()}.

 

If your flasher module turns off the bulb (when you have the brakes applied) by bringing the associated wire to ground (), the beeper circuit will be momentarily energized through the path to ground and the opposite lead being (+).

 

If your flasher module simply opens the associated lead (leaving it "float") the beeper will be energized via the path to ground through the resistor, and the opposite lead being (+).

 

You will hear a disruption of the signal's cadence when applying or releasing the brakes. This is a benefit for those who have dashboard cameras, because this box or the vehicle's turn signals are not in the camera's field of view.

 

With the sound of the beeper, the fact that you signaled and / or applied the brakes will be recorded by the dashboard camera in case some Asshole gets you into an collision, and if the collision is NOT your fault, Jacoby & Meyers will love you for handing them a slam-dunk case, and your lawsuit will get you a structured settlement (or at least a new car) which will then enable you to call JG Wentworth.

 

IMPORTANT: Make sure that the Piezo Beeper (PZ1) you select is rated for 12 to 18 Volts DC. DO NOT use mechanical buzzers or Piezo speakers for PZ1. A Radio Shack employee should be able to assist you in making a selection from the available components. When selecting a Beeper, make sure it will fit in the enclosure (or the space) where you want to install it. If you put the unit in a small project box, don't forget to mount it directly over a 1/4" or larger hole drilled in the enclosure; otherwise, it will not be heard. If you are building the ENHANCED project and are installing beepers for both signal and brakes, make sure the beepers for the brake and turn signals are different frequencies so that you (and your dashboard camera) can tell the sounds apart. Optionally, since these Piezo beepers are pretty loud, you can use a 5,000 Ohm 1/4 Watt potentiometer (not shown in the diagrams) between the beeper and the circuit to act as a volume control. If you are using two beepers, a dual potentiometer is required; just make sure that the current draw specifications for both beepers is identical.

 
Left, right and tail light internal indicator box mounted on Jeep Roll bar

The Turn Signal Monitor / Beeper project box mounted on the Roll Bar on the driver's side approximately 2 feet from the rear window. The rocker switch (red lever on the right side of the box) can be used to turn the monitor & beeping off.

Mounting is done with #10 self-drilling screws and large washers (inside the box).

The red / black wires in the photo go to an auxiliary cigarette lighter socket used to power the rear-facing Dashboard Camera.

   
Enhanced Left, right, brake and tail light internal indicator box mounted on Jeep Roll bar

Adding another indicator (the red BRAKE LED) requires a bit more circuitry. Basically, the red BRAKE LED comes on when BOTH left and right LEDs are lit. This requires either two 12VDC SPDT relays or two NPN high-power transistors to accomplish. The BRAKE indication can also be used to power a center LED brake light array if your vehicle does not have one.

If you just want an audible indicator, the circuit below will do.

Wiring diagram for Turn Signal Beeper for Jeep and SUVs equipped with trailering package

If you would also like to have a visual indication of turn signals, use the following circuit added to the circuit (above). This is useful if you want a dashboard camera mounted so that it can "see" the box, to record your signaling / braking actions so that in case of a collision, you can prove that you were not at fault. If you mount the box (or external LEDs) where you can see it (such as on a Radio Crossbar), it can serve as an additional indicator of your turn signals.

Wiring diagram for Turn Signal LED Monitor for Jeep and SUVs equipped with trailering package

 

If your vehicle does not have a center brake light, you might want to add one. A simple addition to the above circuit enables you to connect an LED center brake light, while also having an indication inside the cab that the brake light circuit is working. The addition of two miniature relays (available at Radio Shack or www.AllElectronics.com) enables you to connect such an LED light, and you can also connect a Piezo beeper (with a different frequency than the turn signal beeper) for an audible indication of brakes being applied, and turn signals being used. In my particular case, I mounted the beepers in a separate box mounted on the Radio Crossbar using the miniature connector (top right of diagram).

The circuit and project shown below, not only serves as a visual and audible indicator for turn and brake signals in a noisy environment, a dashboard video camera which has this box in its field of vision, becomes an infallible and impartial "witness" in case of a collision.

It is beyond the scope of this page, but using a bit of electronics knowledge, you can duplicate all the indicators, provide a volume control for the turn signal beepers, an {on with ignition / off / always on} rocker switch for the dash cameras, and an on / off toggle switch for a backup beeper all in a medium sized Radio Shack project box mounted to the Radio Bar.

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