However, if you're determined to do it yourself, here's a general outline of the process. This is not a complete, detailed guide, and specific procedures will vary depending on your exact van model (E-Series, Transit Connect, etc.). Always consult a wiring diagram specific to your year and model.
1. Planning and Parts:
* Determine your needs: How much power do you need? This dictates the size and type of auxiliary battery (AGM, deep-cycle, etc.).
* Choose a location: A well-ventilated, secure location is crucial. The engine compartment is often too hot. Consider the under-hood area, though you may need to fabricate a bracket. The van's interior (with proper ventilation) or even under the van are also possibilities.
* Gather parts:
* Auxiliary battery (correct size and type)
* Battery tray and mounting hardware (if needed)
* Heavy-gauge wiring (at least 4 gauge, possibly larger depending on battery size and load)
* Battery isolator (crucial to prevent draining your main battery) – a solenoid-based isolator is generally preferred.
* Fuses (inline fuses are mandatory on both positive and negative cables, sized appropriately for the wiring gauge and battery capacity)
* Wiring connectors, crimping tool, heat shrink tubing
* Circuit breaker (recommended for added protection)
* Grounding strap
* Appropriate tools (wrench, screwdrivers, drill, etc.)
2. Installation:
* Secure the battery: Mount the auxiliary battery securely in your chosen location using a tray and appropriate hardware.
* Run the positive cable: Run a heavy-gauge positive cable from the positive terminal of your auxiliary battery to the positive input of your battery isolator. This cable needs to be fused close to the auxiliary battery.
* Run the negative cable: Run a heavy-gauge negative cable from the negative terminal of your auxiliary battery to a clean, grounded point on the van's chassis. This cable also needs to be fused close to the auxiliary battery.
* Connect the isolator: Connect the isolator to the main battery's positive terminal and the auxiliary battery’s positive cable as per the isolator's instructions. The isolator will typically have a connection for your vehicle's charging system (alternator) to charge both batteries.
* Install fuses: Install inline fuses on both the positive and negative cables very close to the auxiliary battery.
* Test the installation: Use a voltmeter to check the voltage of both batteries. Verify that the isolator is correctly isolating and charging both batteries when the engine is running.
3. Wiring Considerations:
* Grounding: A solid ground connection is critical. Use a heavy-gauge cable and ensure a clean, unpainted metal surface for the ground connection.
* Fuse placement: Place fuses as close as possible to the battery they are protecting.
* Cable routing: Route the cables neatly and securely, avoiding sharp edges and moving parts. Use cable ties to keep them organized.
* Ventilation: Ensure adequate ventilation around the auxiliary battery to prevent overheating and gas buildup.
Disclaimer: This is a general overview, and the specific installation steps will vary based on your van's model and your chosen components. Improper installation can cause serious damage. Consult a wiring diagram specific to your vehicle and seek professional help if you are unsure about any step. Incorrect installation could lead to electrical fires, damage to your vehicle's electrical system, and personal injury. Again, professional installation is strongly recommended.
