A530T yummy ... Wouldn't be without mine. Anyhoo, biggest problem with the GVP sidecars is the power supplies. I have quite a few and the capacitors inside just ooze and die. So its worth checking if you have an original PSU. Also check the connector cus they can be a problem inserting and I've had them with damaged connectors, especially at the ends. And also worth getting a ground if you don't have one fitted. Poor connectivity can cause consiiderable issues and power.
https://www.scuzzscink.com/amiga/scuzzblog_december17_12/car_sbd_301217_09.jpgSimply the best.
