Voltage regulator, and pulsing lights

[LariatBob]

It's not like you need to filter out a pulse so you can't build a capacitive filter circuit. The voltage is actually going up and down, typically from 12v while not charging to 14v while charging.
How often is it switching?

[brianakell]

It's not like you need to filter out a pulse so you can't build a capacitive filter circuit. The voltage is actually going up and down, typically from 12v while not charging to 14v while charging.
How often is it switching?

Every second or so. Definately not cycling 12v/14v.