- 1). Turn off the engine before checking under the hood of your Jetta. It is also a good idea to wear goggles and rubber gloves to protect from sparks and battery acid.
- 2). Remove any metal jewelry before you check the battery in your Jetta. These could cause a spark when you touch the battery cables.
- 3). Lift the hood of your car, and look for visual signs of corrosion on your battery. This is normally evident as a white or yellow powder on the battery. If there is powder present outside the cables, pour a mixture of baking soda and water over the powder to remove the corrosion. The baking soda causes the powder to bubble and turn brown. Once the powder begins to wash away, you can remove the residue with plain water.
- 4). Check the battery cables for corrosion by cutting into the plastic coating on the battery wires. Look in the plastic for powder or a green tint on the copper wires. If there are signs of corrosion in the cables, these cables should be replaced.
- 5). Test the tightness of the battery cables on your Jetta by using your hand to try to move the cable ports. If there is any budge in the cables, you should tighten them with a wrench.
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