$99 Enclosed cargo trailer alarm system

Discussion in 'Trucks and Trailers' started by Davids Lawncare, Feb 19, 2013.

  1. LDH

    LDH LawnSite Bronze Member
    Messages: 1,262

    Nice. Definitely a good idea. Thanks for the info!
  2. LDH

    LDH LawnSite Bronze Member
    Messages: 1,262

    David, I ordered the same alarm in your video. Got it in the mail today, took out the instruction book and paused your video so I could copy (highlight) the wires you used. I'm copy catting your setup for my enclosed. Quick question: Did you wire both of your sirens into the brown wire? The factory siren has a red and black lead. In the manual it states connect the brown to the red on the siren. Did you connect both sirens to this brown wire or does your exterior siren connect to a different one?
  3. recycledsole

    recycledsole LawnSite Gold Member
    from MD
    Messages: 3,274

    thanks David that is an great idea you have implemented. thanks for showing us
  4. BlakeleyPropertiesLLC

    BlakeleyPropertiesLLC LawnSite Member
    Messages: 10

    Thinking of doing the same, how's it working out?
  5. Patriot Services

    Patriot Services LawnSite Fanatic
    Messages: 14,506

    Add this to your trailer for total protection from the scumbags. Easily concealed in an enclosed trailer and worth 7.95 a month.

    ericg likes this.
  6. Falcon50EX

    Falcon50EX LawnSite Senior Member
    from GA
    Messages: 994

    How did you connect the wires?
  7. BlakeleyPropertiesLLC

    BlakeleyPropertiesLLC LawnSite Member
    Messages: 10

    Very interesting, but does the signal penetrate the box? Have you used it for long?
  8. ZoneIII

    ZoneIII LawnSite Member
    Messages: 2

    Actually, that's incorrect. That is, the truck doesn't send a signal that causes the trailer battery to actuate the trailer brakes. The trailer brakes are powered by the towing vehicle battery. If it was the case that the trailer battery was actuating the brakes, as you wrote, the little trailer battery would be dead in no time. It's not charged by the towing vehicle in the common installation. In the standard installation, the trailer (break-away) battery does nothing unless the the pin is pulled out of the break away switch. That will happen if the trailer becomes disconnected from the hitch. When that happens, the pin is pulled from the break away switch which closes the circuit from the trailer battery to apply the brakes to stop the trailer. Other than that, the trailer battery does nothing. In other words, the trailer battery is just there for emergencies if the trailer is disconnected from the hitch. If the trailer battery powered the trailer brakes when it received a signal from the towing vehicle, it would have to be charged continuously by the towing vehicle. It isn't. That's why you have to charge it periodically.

    Notice that there are only two wires connected to the trailer battery. It's a simple circuit to the trailer brakes only interrupted by the break away switch. The trailer battery is not connected to the towing vehicle at all in the standard installation. That said, I think you can wire things up so the towing vehicle charges the trailer battery but, even then, the trailer battery is only used for emergencies if the trailer becomes unhitched. Normal braking is still powered by the towing vehicle. That setup would only charge the trailer battery.
    Last edited: Nov 2, 2017

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