Hi gang .... I'm working on an '89 full size van, vin no 2B6JB31Y1KK354409. This van is a Coach House conversion but the power mirrors are factory. I have no power to the switch and I don't know where that power is supposed to come from. All 10 glass fuses in the box under the glove box lid are good. The switch has an 8 wire pigtail which best I can tell is 4 wires for each side. It's a "joystick" type control and you turn the knob left or right to select the mirror youwant to adjust. I did verify mirror motor operation by supplying outside power via the plug. Any help is appreciated!