Rear fog wiring
 

Not really a guide, looking for input.

Currently I have my rear fog wired to the tail lights. I was thinking I'd like to have it on when the DRL's are on, as a sort of rear drl, for those times when it's not dark enough for the headlights to turn on, but I'd still rather not get rear ended. So, I was thinking of using the turn-on lead for the amp.

In this case, the rear fog would be on, whenever the car is on, unless the radio is off? is the amp turn-on controlled by ignition, or radio? too much draw for the turn-on lead? I could use a relay if need be too, and tap into the amps power lead too.

Any other sources of power in the back of the car?