Never apply power to a Curtis 1515 with the main leads disconnected. The flyback voltage will destroy the MOSFETs instantly. Read the safety section of the manual before you touch your probes to the B+ terminal. Do you have a specific error code flashing on your Curtis 1515? Drop it in the comments below and I’ll try to decode it for you.

And now you need the manual.

If you’ve landed on this page, you’re likely staring at a golf cart, an electric forklift, or a sweeper that isn’t moving. In the center of that spaghetti bowl of wires sits a silver box: the Curtis 1515 controller.