To sum it up: What should you measure to check the charging system of your Equinox? If this increment was below the range, the alternator is probably damaged. If during this measurement process the voltage went up outside the mentioned range, the voltage regulator must be damaged. The multimeter should still show the same reading. Lastly, accelerate and turn all the electrical accessories off.The multimeter should still show a reading between the aforementioned ranged. The next test is to accelerate until the engine is at 3,000 RPM without turning the electrical accessories off.The multimeter should still be between the aforementioned range. Now we must turn on all the electrical accessories of the car: lights, air conditioner, defogger, etc.With the tips of the multimeter in the same position and with the engine on, the multimeter should show a reading between 13.2 and 14.8 volts. The multimeter should show a reading higher than 9 V, and it will usually be between 9 and 11 volts. For this step, someone else should help you out. In other words, when we twist the ignition key.
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