1994 Saturn SL1 Repair Question
Saturn SL1 Battery Problem
Was that a rebuilt or used generator? Start by measuring the battery voltage while the problem is occurring. The engine must be running. You must have between 13.75 and 14.75 volts. If it is low, suspect the generator. If it is okay or even a little high, have the generator professionally load-tested. If it can only develop exactly one third of its rated output current, and "ripple" is very high, it has a defective internal diode. To prevent numerous repeat failures, replace the battery at the same time unless it is less than about two years old. Due to their design, these generators develop huge voltage spikes that can destroy the internal voltage regulator and diodes, and can interfere with computer sensor signals. As the battery ages, it loses its ability to dampen and absorb those spikes.
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