Spring is here and summer is just around the corner. In hot weather the vehicle’s charging system is taxed more than any other time of the year. Hot weather brings increased electrical loads from air conditioners and other loads such as coolers and fans associated with hot weather operation. Alternators draw air from the back of the alternator to the front for cooling. As the temperature outside rises and air is drawn across the engine and turbochargers, it becomes super heated. How well the alternator can produce current and still dissipate that heat has a direct impact on its lifespan.
Fleets often check the air condition system in spring to ensure the systems are ready to operate before hot weather hits. This is the perfect time to check charging systems as well. The batteries should be tested individually; the charging circuit tested for voltage drop (per TMC-RP-129); and the alternator tested for output. When testing the alternator it is highly recommended to use a tester that can detect alternators that have a defective diode or stator, these are the defects that can easily be over looked and soon fail on the road. Also look for the following:
- Oil on the alternator. Oil on the alternator collects dirt and dust on the rectifiers and prevents the unit from dissipating heat.
- Loose pulleys or fans. They could slip and not pull much air through the alternator. This will prevent the unit being cooled as designed.
- Inspect the belts and the automatic idler systems that drive the alternator. Both of these are wear items and must be in good working order before another hot summer.
Remember - A little work now could save a lot of headaches down the road!
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