The answer to this question is yes, a malfunctioning air conditioner can cause the battery light to come on. This is because the AC system draws power from the car's alternator and when there's a problem with it, it can place an extra load on the electrical system as a whole. This causes the vehicle’s charging system to send out too little voltage or current, which in turn triggers warning lights like the battery light. Common issues that could lead to this include faulty wiring or connections within your AC components such as compressor failure or lack of refrigerant due to leaks in hoses and other components. It’s important that you address any issue regarding your AC right away so you don't run into more serious problems down the road - not only will this help keep your engine running smoothly but also improve its efficiency for long-term savings on fuel costs!