Why does the battery light come on in rainy weather?

[Karl]

Main influencing factors are as follows: 1. Battery failure: such as depleted power, battery failure, etc. The solution is to use a multimeter to test the battery voltage. If the voltage is low, recharge it; if the battery fails, replace it. 2. Battery terminals: Loose or oxidized battery terminals causing poor contact can also trigger the battery light. The solution is to clean and tighten the battery connections. 3. Alternator belt: A loose alternator belt or tensioner pulley can cause the charging system to malfunction and illuminate the battery light. The solution is to replace the belt or adjust the tensioner pulley. 4. Alternator voltage regulator: Faulty alternator voltage regulator or excitation circuit issues can cause abnormal operation and trigger the battery light. The solution is to troubleshoot the alternator.