The Davco 3600‑1000 MOD is a digital exciter/regulator used to set and maintain the excitation voltage of an industrial alternator. Common failure points in this class of units include degraded power supply rails, burnt capacitors or resistors on the regulator board, and failed control signal inputs from the motor controller. First‑check steps: verify that the unit receives the correct input DC voltage and that all fuses/thermal cutouts are intact; inspect the PCB for visible burn marks, cracked solder joints, or swollen electrolytics; then use a multimeter or oscilloscope to confirm proper output excitation voltage and control logic signals before proceeding with component replacement.[oss-gpt-20b]