Primecom Short Circuit or Ground Fault on Start-Up

Charger trips the house breaker immediately when starting a charge.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Shorted relay contacts to ground, Pinched internal wiring touching chassis, Shorted J1772 cable conductors, Incorrectly wired input terminals

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset a breaker that trips instantly; this indicates a serious fault.

  • 1. Inspect cable and connector: Look for obvious damage, cuts, or melted areas on the Primecom cable and handle.
  • 2. Verify wiring (hardwired): With power off, confirm that line, neutral (if used), and ground are correctly connected and that no strands are touching adjacent terminals or the chassis.
  • 3. Insulation test (technician): Use a megohmmeter to check insulation resistance between conductors and ground.
  • 4. Isolate charger: Disconnect the charger from the circuit and see if the breaker holds with the charger removed. If so, the fault is inside the charger.
  • 5. Replace damaged components: Replace any shorted cable, relay, or wiring harness. If the fault is on the control board, replace the board or entire charger.
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Repair Difficulty

Professional Required 5/5

Required Part

J1772 Cable Assembly / Internal Wiring / Main Power Relay
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