Low cost RFID keyless reader modification with relays to turn on 12V circuit.

eBay RFID Alarm Push Button Start Transponder Immobilizer System Keyless Engine Car review and modification to turn on an electrical circuit with two 12V relays.

These kits actually turn off the ground connection on the triggered wire connection. I wanted to be able to turn on a circuit, so I needed to reverse the switching connection, by using 2 relays.

Typical automotive 12V relays have 5 terminals.
85 and 86 are the terminals to activate the coil relay, connected to positive and ground connections, usually by a switch
30 is the common terminal to be switched on or off
87 is the Normally Open (NO) terminal which is connected to terminal 30 when the coil is activated
87a is the Normally Close (NC) terminal which is connected to terminal 30 when the coil is NOT activated

Schematic diagram here:
https://drive.google.com/file/d/1eQMyQEsDlLJpgu-QcD9fMyteNcGhkGcG/view?usp=sharing

Видео Low cost RFID keyless reader modification with relays to turn on 12V circuit. канала Pierre Audette