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r car's alternator is tasked with a few important jobs. First, it is responsible for generating a sufficient amount of electricity to keep your battery charged while your vehicle is in operation. Second, while your engine is running, it is responsible for keeping the electrical system engaged. By some measures, the alternator is the hardest-working component under your car's hood. But it can fail for a number of reasons. When it does, your vehicle will be forced to rely on your battery for power [link widoczny dla zalogowanych], slowly draining it until you're unable to crank the engine.
Fortunately, there are a few telltale signs your alternator is on the verge of failing. The following indicators suggest the component needs to be replaced before it leaves you stranded at the side of the road.
The Indicator Light On Your Dashboard
Let's start with the most obvious warning sign: your dashboard light. This indicator light is connected to your vehicle's computer, which monitors your alternator - or specifically, its output. The computer is programmed to trigger the light if the output goes outside a defined range. You may notice the light turning on and off as the component's output crosses the threshold and returns.
Erratic Behavior In Accessories
Recall that this component is tasked with keeping your vehicle's electrical system engaged. This means your car's headlights, speedometer [link widoczny dla zalogowanych], and other gauges and accessories are influenced by its operation. When the alternator begins to fail, these other parts begin to behave strangely. For example, your headlights will suddenly dim; your speedometer will no longer work; and you may experience difficulty adjusting your power windows. Each of these is a potential sign the component is failing.
The Battery Dies
Car batteries are designed to last for years. They rarely fail earlier on their own. So [link widoczny dla zalogowanych], if your battery dies sooner than it should, the reason may be due to a bad alternator. When the alternator fails, your battery is left to provide the necessary voltage to your vehicle during operation.
It can handle the job for awhile, but will eventually die. This is because it is not designed for this purpose. Under normal circumstances, after generating the initial power for your car, the battery is recharged by the alternator. When the latter component fails, the battery is forced to pick up the slack, and thus is sapped of juice.
It's simple to troubleshoot whether the alternator has truly caused your battery to die. Jumpstart your vehicle and remove the jumper cables. If your alternator is the problem, your battery will quickly lose its strength and die again.
Displaced Belt
Your car's alternator is powered by a belt that is connected to the engine. There must be sufficient tension in the belt in order to engage the component. The problem is, the belt can come loose, which eliminates the tension and causes the alternator to stop working. In this case, the component has not technically failed as much as it has stopped receiving the power it needs in order to work properly.
Poor Connections
Sometimes, the alternator generates the necessary current, but its output cannot be delivered due to bad wires or faulty connections. Here, too, the component is not actually failing. Instead, the electricity is prevented from reaching its destination, which causes a similar outcome. This situation is often difficult to troubleshoot, and thus is best left to your mechanic.
If your alternator fails and needs to be replaced, plan to spend up to $400. A rebuilt component should cost less than $150. However, the labor makes up the bulk of the bill. Assuming that replacing it is a 3-hour job, and your mechanic charges $70 per hour, the entire service will cost $360 ($150 + $210 in labor). Given the high cost, it's worth investing in an OEM-certified replacement.