Hello together, have found no comparable contribution in any forum and would need some help. Project: Would like to install a modern garage door opener firmly in the car Situation: In the car is already installed a switch, which closes a 12V circuit and ends with a +/- cable in the engine compartment. i.e. when the switch is active in the interior, the cable in the engine compartment 12V voltage arrives. Here can now be connected a customer (formerly here was an outdated Gara gentoröffner module installed that doesn’t match today’s gate). Problem: The handheld transmitter for the modern and current gate runs with 3V. How can such a handheld transmitter be connected there, so that the door opens when the pressure switch is pressed in the interior? Suggested solution: convert 12v to 3v (how?), clamp to the battery contacts of the handheld transmitter and press the button to open permanently there? (sounds very amateurish) Thank you for your help. I’m sure you can do anything about this. how better and easy to solve! LG