A technician is troubleshooting a 24V system on a large wheel loader. The operator reports that the headlights are dim, and the horn sounds weak. Upon inspection, the technician finds that the positive battery cables connecting the two 12V batteries in series are corroded. What is the most appropriate next step?

Question: A technician is troubleshooting a 24V system on a large wheel loader. The operator reports that the headlights are dim, and the horn sounds weak. Upon inspection, the technician finds that the positive battery cables connecting the two 12V batteries in series are corroded. What is the most appropriate next step?

Answer options: ✅ Clean the corroded battery terminals and cable connections, then retest the system.

• Replace both 12V batteries with new 24V batteries.
• Install a higher amperage alternator to compensate for the resistance.
• Bypass the battery cables and jump-start the machine directly from the starter.

Correct answer: Clean the corroded battery terminals and cable connections, then retest the system.

Explanation: Corroded battery cables introduce high resistance into the electrical circuit, leading to a voltage drop across the connection. This reduces the effective voltage supplied to components like headlights and the horn, causing dimness and weakness. Cleaning these connections is the first, most logical, and cost-effective corrective action and should resolve the issue.