Originally Posted by fordfasterr
I currently have a large 4 led trailer tail-light hooked to a 5ah 12v slab. I want to make it flash / strobe all the time...
It is currently just always ON.
In that case, you might just want to replace one of the LEDs with a flashing LED, which will make all four LEDs flash at the same time. You need to be able to solder, though.
At least, I'm about 95% sure this is what will happen....