We have around 30 PC4500,s. We are having issues with HID readers going bad. I have found that all lifts have 26 volts going to the frame. Not sure if this is the cause or not, I just don't think it's right. I did discover that the radios we installed had to be isolated from the frame. When doing this my voltage dropped to 14 - 18 volts, witch is acceptable by Crown. But I have some lifts it did not change. Talked to Crown support and they told me to start disconnecting components until I find the issue. I have disconnected about everything and still have issue. Has anyone had this issue? I can understand if this was only one lift with the issue but I have 20+ with this issue. I can say the lifts work fine, no error codes. I'm just trying to explain why we have so many HID readers going bad.