However, if the alternator is covered (soaked) in engine oil or other fluid types, the source of the contamination must be found and repaired. Failure to do so will reduce alternator performance and may even cause an electrical fire.Ĭontamination on the Alternator like Oil, Grease, or Antifreeze: A small amount of outer surface contamination is normal. If it appears ‘burned’, has a cracked or melted terminal end, damaged or missing wiring insulation or feels ‘stiff’, the battery wire should be replaced. Use a small amount of water proof grease (dielectric grease) on the connector and alternator plug-in during installation.īattery Terminal B+ Voltage Wire: The alternator 12v battery wire can become worn or damaged over time. A loose terminal or damaged pigtail connector can cause electrical and charging problems. A worn belt pulley (idler) or belt tensioner will cause belt slippage, squalling sounds, uneven belt wear and poor performance of the alternator and the other drive belt accessories such as the power steering pump.Įlectrical Plug Pigtail Connector: Ensure the alternator pigtail and harness are clean and intact. Also check the alignment of the drive belt and pulley(s). The belt tensioner must not be extremely tight or loose. It should feel ‘smooth’ without ‘sticking’ or ‘binding’ as it swings back-&-forth with the belt tensioner tool. Inspect and replace any additional belts as needed.ĭrive Belt Tensioner: If so equipped, the belt tensioner can be inspected while removing the drive belt. A worn drive belt will produce noise and reduce the performance of the alternator. Look out for cracks, frays, and overall wear and tear. While you’re looking at the alternator, inspect the following related parts of the starting and charging system:ĭrive Belt: This should be changed every 90,000 miles, and while your replacing your alternator is a perfect time to replace this belt if its time is soon to pass.
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