Relay Wiring Diagram Positive Ground

If you have a switch or an alarm or keyless entry that has a positive output that you wish to use to switch a device that requires a ground such as a horn dome light parking lights head lights hatch release etc wire a relay as shown below to convert the positive output trigger to a negative output.
Relay wiring diagram positive ground. These are standard automotive style relays that can be found just about. Disassembled bosch style relay. Microsoft word positive ground relay wiring schematic doc author. So you should connect pin 86 to 12 pin 87 to the horn wire and to make the horn beep you ground pin 85.
This system effectively earths the vehicle as the chassis attaches to the battery using a positive battery cable. Weak negative output to strong ground output relay wiring diagram. If you have only a positive signal for horn then you can add a small 12v relay to operate the horn relay or add a transistor and a resistor and a flyback diode. When this is the case use the following diagram.
We use the negative output to turn on off a relay and the relay passes the positive through to the load. The cable is tethered to the battery at one end and the engine block at the other. A positive ground system works by directly connecting the chassis of a vehicle to the positive side of the vehicle s battery. Convert a positive output to a negative output.
Often it is necessary to provide a stronger ground than the negative output of an alarm or keyless entry can provide. Brad sandberg created date.