This document outlines how to improve the charging of a second battery in certain Toyota Prado models using an alternator voltage booster. It addresses the common misconception that a DC-to-DC charger is always necessary for dual battery setups.
Problem
The factory alternator in some Prado models may not adequately charge a second battery in a dual-battery system. This can be due to the alternator’s charging profile or voltage drop in the wiring. Some auto electricians may recommend a DC-to-DC charger as the only solution.
Solution
An alternator voltage booster can be used to increase the charging voltage, ensuring both the main and auxiliary batteries are adequately charged.
Specific Fix: Installation of an alternator voltage booster.
Relevant Parts
- Alternator Voltage Booster: Available from HKBElectronics (http://www.hkbelect.com/). Note that different brands may offer varying levels of protection.
Compatibility
- Suitable for Prado models up to and including the 3.0L diesel variants.
- Not suitable for the 2.8L diesel Prado model.
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