Those of us that have transits and sprinters and promaster's that want the doors open for ventilation, often have the dilemma of having a cargo light remain on while they're open. Eventually the timer will time it out and it'll go off.....hopefully.
Anyway, my wife was bugged by the fact that ours would not go off for the longest time and she was afraid it was going to kill the battery. Therefore, I went to YouTube and looked around but I did not find a solution as simple as the one I've just described here. I hope this helps you all.