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There is a certain "low" threshold before the alt light comes on. It can also be burned out.
Check your voltage regulator and make sure all connections are clean.
A coolant leak can cause problems for the alternator, if it gets totally soaked and saturated with water and coolant.
How old is the battery? Also, was the battery electrolyte level properly maintained? Low levels will kill a battery.
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RRGrassi
70's Southern Pacific #5608 Fairmont A-4 MOW car
13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.
91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K
90 Dodge D250 5.9 Cummins/5 speed. 400K
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