Why do my Headlights/Dash Lights Pulse in Time with the Bass of my Music

This happens as a result of your amplifier trying to draw as much current (amps) as it can to produce large/loud bass notes, with low frequency notes the biggest culprit. In some cases the alternator is unable to supply enough to the amp and other devices. As a result of this, other devices may not function correctly, like headlights etc. You need to ensure that your alternator is providing the correct amperage, or it may need replacing or reconditioning. Apply a load test to your battery to ensure it is in good working condition. Do not assume that adding a capacitor or a second battery will solve the problem, because if the alternator is not providing enough amperage, it will only solve it temporarily. Investigate a higher output alternator.