The Zareba A200LI is an AC‑powered low‑impedance electric fence charger rated at 15 joules, capable of energizing up to 200 miles of fencing and designed to operate reliably in wet or heavy weed conditions. Common failure points on this model include a defective transformer secondary winding, degraded output capacitor or relay contacts, and corrosion or loose connections on the high‑voltage line terminals. Initial checks should verify that the unit is receiving its rated AC input voltage and that the power indicator lights are functioning; inspect all wiring harnesses for frayed insulation or broken conductors, and examine the output terminals for signs of arcing or corrosion. Finally, run a short‑circuit test on the output line with a calibrated multimeter to confirm proper joule delivery before re‑installing the fence.[oss-gpt-20b]