Just bought a 1990 GW1500SE and am in need of some help. When I open the trunk, there is a switch on the back left corner that is activated (or de-avtivated) when the trunk is opened. I have turned on the ACC and Start switch and then used my thumb to toggle the switch, and I cannot see that it does anything. My Owner's Manual does not describe this switch at all. Anyone know what it's for?