Harborwright sells the part only — we don't install it. These are general steps; your boat and the maker's manual come first. If you're not sure, have a marine shop fit it.
Safety: Disconnect both batteries before wiring and fuse each positive cable close to its battery — a battery-cable mistake can start a fire.
Steps
- Mount the isolator in a dry spot close to both batteries.
- Connect BATT1 to the positive of the main battery, the one the engine charges. VEVOR says the isolator won't work if the charging battery isn't on BATT1.
- Connect BATT2 to the auxiliary (house) battery positive.
- Connect the ground wire to negative.
- Size the cables and fuses as the VEVOR manual shows, then reconnect the batteries.
- Check the display shows both voltages. By default, Auto mode connects above 13.3 V and disconnects at 12.7 V.
Follow the maker's manual for your exact model first — it's linked with each part below.
Videos
Videos are by other channels and show similar parts, not always the exact model we sell.
