[Bill G]

Agreed. If you turn off a battery disconnect while the car is running, the battery will indeed, be turned off and out of the circuit. The car will then be running off the generator, and with no battery to hold it back, the generator will try to charge like crazy and **poof** go the lights.

Moral of the story:

Do install a disconnect switch. They are a safety feature and many consider them a must.

Don't try to use it to turn off a running car. Turn it on and off while the car is not running.