Document Title: BI124 DC-DC Converter Manual.pdf
Applies to: All Harvok caravans equipped with 120A Anderson-style towing charge system
Device Function: 12V DC-DC Converter for alternator-based towing charge
Location: Inside caravan, connected to 120A Anderson plug input
Key Features
- Converts alternator output to suitable charging voltage for 48V battery system via built-in step-up
- Supports up to 1200W / 100A power flow
- Ignition-activated charging via 12-pin plug (Pin #12)
- Internal DIP switch configuration for smart vs standard alternators
- Includes overvoltage, undervoltage, and over-temp protection
Wiring Notes
- Use 25mm² cable for safe high-current transmission from vehicle to caravan
- Ignition signal must be wired correctly from tow vehicle to enable activation
DIP Switch Configuration (Standard Setup)
| Switch | Position | Description |
|---|---|---|
| #1 | ON | Enable charging |
| #2 | OFF | Default |
| #3 | ON/OFF | ON for Smart Alternator, OFF for Standard |
| #4 | OFF | Default |
| #5 | OFF | Default |
| #6 | OFF | Default |
Troubleshooting Indicators
- Unit will fail to start if ignition wire is not active
- Clicking on/off indicates unstable alternator supply or incorrect DIP settings
- For stable operation, ensure alternator maintains sufficient voltage even under load