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<blockquote data-quote="KaeZoo" data-source="post: 1092922" data-attributes="member: 554753">Would help to know what kind of vehicle it is.&nbsp; Basically the e-brake wire is one that is connected to ground when the brake is set.&nbsp; It&#039;s usually a single wire, connected right to a switch built into the parking brake mechanism.&nbsp; If it&#039;s under the dash, it shouldn&#039;t be too hard to see; if it&#039;s in the console, it might be a lot tougher to find without some disassembly.It sounds like you don&#039;t have an in-dash mobile-video system with its own e-brake wire.&nbsp; If this is true, you&#039;ll need to use a relay to interrupt the power wire to your screen.&nbsp;&nbsp; Wire the relay like this:85--key-switched 12v+86--parking brake wire87--12v+87a--not used30--to 12v input on screenThis will allow voltage to get to your screen as long as your key is on and the parking brake is set.&nbsp; If your screen&#039;s power supply has separate wires for constant power and switched power, then use the switched power through the relay.&nbsp; Be sure to use a key-switched power source for the relay coil (85); if you use constant power and set the parking brake with the vehicle off, the relay will activate and eventually drain your battery.</blockquote>

[QUOTE="KaeZoo, post: 1092922, member: 554753"] Would help to know what kind of vehicle it is. Basically the e-brake wire is one that is connected to ground when the brake is set. It's usually a single wire, connected right to a switch built into the parking brake mechanism. If it's under the dash, it shouldn't be too hard to see; if it's in the console, it might be a lot tougher to find without some disassembly. It sounds like you don't have an in-dash mobile-video system with its own e-brake wire. If this is true, you'll need to use a relay to interrupt the power wire to your screen. Wire the relay like this: 85--key-switched 12v+ 86--parking brake wire 87--12v+ 87a--not used 30--to 12v input on screen This will allow voltage to get to your screen as long as your key is on and the parking brake is set. If your screen's power supply has separate wires for constant power and switched power, then use the switched power through the relay. Be sure to use a key-switched power source for the relay coil (85); if you use constant power and set the parking brake with the vehicle off, the relay will activate and eventually drain your battery. [/QUOTE]

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