I'm powering a sub in my garage with a car amp attached to a car battery. The battery is charged by a trickle charger. The charging circuit is controlled by a relay. I have a switch that turns the charging circuit on and off. (see diagram). When I turn on the switch, the red LED turns on but the relay makes a loud buzzing noise. It sounds like the relay is rapidly switching on and off- like what would happen if you connected power to pole 87 instead of 87a. But it's hooked up properly. What could be the matter?
Dan
Dan