dual battery wiring | eBay Find great deals on eBay for dual battery wiring. Shop with confidence. Skip to main content. eBay Logo: TRAXXAS 3064X PARALLEL WIRE HARNESS BATTERY CONNECTOR / ADAPTER 1/16 DUAL iD. Brand New. 5.0 out of 5 stars. 5 product ratings - TRAXXAS 3064X PARALLEL WIRE HARNESS BATTERY CONNECTOR / ADAPTER 1/16 DUAL iD. $9. DUAL BATTERY KITS - Wiring Harness | Perth | Harness Harness Master produces a range of dual battery kits to ensure enough power is supplied to the starting battery of a vehicle, leaving customers stress free about their vehicles battery life. Manufactured from 2mm powder coated mild steel, our kits contain a battery tray, battery cables, an over ride switch, solenoid and a wiring harness.