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I fitted them in and they worked great, until I took the batteries out and then out them back in and the controller wouldn't turn on, so I took the trigger lights off and it worked again, I put the "-" wire to the terminal and then touched the red wire on the other terminal and then the controller went off again. It seems when I connect the LEDs the controller shuts off and won't turn back on
Follow this Tutorial you will have less issues with lighting xbox 360 controllers if you just follow thisshows you where to add positive and negatives for leds where and what leds to use trust me this guy is one of the best on the site for led mods for controllersi use it all the time and shorten your wires up where your soldering to you could be shorting something out , there in the right location that is needed to power the led. https://www.acidmods.com/forum/index.php/topic,33937.0.html
Where do you get breadboards from?