How do you get a amp capacitor to shut off after the car is off?

Answer 1

Installing a power amp or capacitor in line with the ignition system of the car is down right irresponsible! The power/amp draw usually is too much for the stock wiring of the car and risks a fire! Here is the best solution. My company makes a similar product for the military that utilizes a low amp wire to open and close a relay supporting high amp/voltage circuit. Here's how: Go to Radio Shack and get a relay. The part number is 275-218. You will also need 275-220 Mounting kit. (The socket for the relay) We use a PCB to mount the socket, but you can direct solder the wires. Looking at the relay where the pin-outs are, you will see that 6 of the blades are horizontal with them in a tandem array. (Two are side by side in three rows) The last two blades are vertical. These two are power supply to energize the coil in the relay. (This is where the relay connects to the ignition switch) Using the diagram/schematics given with the relay, follow the connections exactly. Reversing the polarity of the relay coil will have an opposite reaction to what you want. Remember that one side of the coil is common ground, and the other is power. (Single lead from the fuse box indicating "ign.") You can use a 24 gauge wire for the relay power, and use a 4 gauge or "monster cable" for the amp. The relay will turn on when the ignition is turned on, and likewise turn off with the key. Alternatively, you could direct wire to an "always on" terminal in the fuse box, with a switch on the dash. Either way, the electrical system of your car is protected. The large gauge wire will of course, be connected directly to the battery.