Parmak Precision Mark 5 is a 110‑120 V AC electric fence charger designed for large pastures, featuring low‑impedance output (up to ~6.3 J) and a built‑in digital performance meter that displays voltage and load resistance. Common failure points in this class include fuse burnout or tripped protection due to lightning arrester overload, degradation of the internal transformer windings, and corrosion or loose connections at the color‑coded fence/ground terminals. First‑check diagnostics: verify input power and confirm the unit is receiving proper 110‑120 V AC; inspect the fuse and replace if blown; visually examine terminal connections for corrosion or looseness; review the digital meter display for abnormal voltage or load readings that may indicate a fault.[oss-gpt-20b]