[jtrichard]

OR the switch has been replaced with one that has an ACC position ..... As for how to check for drain when everything is "OFF" pull the + cable off the battery and place your test "light" in between the post and the cable see if it lights up at all the more drain the brighter it will be ....Bad diodes in the alternator will drain the battery in short order and may be why the "GEN" light stays on