This video is me showing how I used a 3 phase elec. motor reversing switch to easily switch a 3 phase alternator from star to delta or vice versa , here is a link to where I bought my switch. https://www.ebay.com/itm/660V-63A-3-Position-8-Screw-Terminals-Changeover-Rotary-Cam-Latching-Switch/312536682618?