Sniper and Trunk Battery help

OK if that device has a load internally that then changes everything regards the alternator. The only issue with it is that the coil draws current anytime the disconnect is energized. On a race car with the disconnect closed during a race day, that might not be an issue. But on a street car especially, you'd want to pull it whenever parked for any length of time.

You also might contact member here DionQ. He had/ was/ is using a relay / disconnect that is a latching setup IE you give it a shot at the control terminals to turn it on, then another shot to turn it back off. This relay does not draw current when the main circuit is active. I do NOT remember if this can be used for NHRA though. And it may be completely off the track