It indicates the one you can see is working. Doesn't confirm all around are working. Same as the one in the inst' panel. I'm more a fan of a noisy flasher module but todays stereos and ear buds would cancel that out. My 73 Valiant had signals on the hood but I honestly don't believe I ever looked at them. I'm always looking well ahead of the hood and quickly glancing at rear view and inst' panel/gauges. I know the signal flasher, cancel cam and all do work in the 2010 RAM I just bought but I haven't heard its flasher module sound.