You can find digitial copies of the GMR-32B series manuals on technical documentation sites like wiring diagram from the manual? GMR-32B Phase controller, 300-400V 50/60HZ - JIEFENG
Given that I don’t have access to a real GMR32B manual, I can instead write a covering the likely issues, troubleshooting, and safety for a phase controller running hot — structured like a manual excerpt. gmr32b phase controller manual hot
Why Is My Golf Cart Controller Getting Hot? - Tara Electric Vehicles You can find digitial copies of the GMR-32B