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critical Everstart

Error Code E4

Reverse polarity detected — the battery clamps have been connected with incorrect polarity.

? What Causes This

Red clamp connected to negative terminal or black clamp connected to positive terminal.

✓ How to Fix It

  1. The charger will emit a continuous beep and display a reverse polarity indicator on the LCD screen.
  2. Disconnect both clamps immediately.
  3. Reconnect with correct polarity (red to positive, black to negative or vehicle frame).

This error code appears in:

Everstart BC50BE Battery Charger