All of the vehicles I've had that had factory rear fog lights had a dedicated switch to activate. I have not seen nor heard of simply adding a bulb without the dedicated switch. Not that I'm the authority on dedicated rear fog lamp switches or anything ..
Interestingly enough, these were all European USDM spec cars, ranging from '85 to '08. The '85 did have the rear fog lamp switch (pull the headlamp switch out once for front, twice for rear... think about how you set the time on an analog watch) but did not have bulbs installed from the factory. The sockets were there, but had no way of being electrified as the circuitry simply wasn't there.
Interestingly enough, these were all European USDM spec cars, ranging from '85 to '08. The '85 did have the rear fog lamp switch (pull the headlamp switch out once for front, twice for rear... think about how you set the time on an analog watch) but did not have bulbs installed from the factory. The sockets were there, but had no way of being electrified as the circuitry simply wasn't there.
