CCTV & Security
Electric Fence Problems: Why Is My Fence Not Shocking, and How to Fix It
Short answer
A weak or dead electric fence is usually caused by vegetation touching the wires, broken or dirty insulators, loose joints, a poor earth connection, a flat backup battery or a faulty energiser. Switch the energiser off before touching wires, inspect the line, and call a technician for earth or energiser faults.
Common faults
| Symptom | Likely cause | Fix |
|---|---|---|
| Low voltage along the fence | Vegetation, loose or corroded joints | Clear plants, tighten or replace joints |
| Zero voltage | Dead energiser, tripped power or flat battery | Check power and battery; service the energiser |
| Alarm triggers randomly | Wires touching, wind, animals or faulty sensor | Re-tension wires, check insulators |
| Voltage drops after rain | Cracked insulators or leaks to the wall | Replace damaged insulators |
| Weak shock even with good voltage | Poor earthing | Improve and test the earth system |
Safety first
- Switch the energiser off before working on the fence.
- Do not use makeshift or non-approved energisers.
- Keep warning signs visible and in good condition.
Maintenance routine
- Walk the fence regularly and trim vegetation.
- Check wires, insulators and corner posts.
- Test voltage with a fence tester.
- Test the alarm, siren and backup battery.
More
Read how electric fences work or ask about electric fence installation.
Common questions
How often should a fence be inspected?
Walk it regularly, and test voltage and alarms at least monthly.
Can I fix the energiser myself?
Leave energiser repairs to a technician. Check power, fuses and the battery only.
What voltage should an electric fence have?
It depends on the energiser and design. A technician can test against the manufacturer specification.