Much like testing your car battery, a multimeter can be used to quickly tell whether your cars charging system is adequately keeping the car battery at the proper charge, and operating the electrical system at the proper voltage as well.. II. The new smart alternator gas saving crap ideas are keeping the alternator from being engaged as long thus less charging. With the headlamps on and the HVAC blower turned to Hi position, charging runs and drives great. I end up using a 3 stage automatic 10/2 amp charger and leave it on at least 12 hrs, sometimes more if I can keep the vehicle still that long. Check charging system wires. Mopar Charging Systems . (Your battery should have a minimum of 12.4 volts.) When voltage drops below 13.5 volts, the regulator will apply current to the field and the alternator will start charging. The actual output voltage produced by the alternator will vary depending on temperature and load, and will usually be about 1.5 to 2 volts higher than battery voltage. up to 1969. With the battery warning light off, standard charging current as measured at the alternator B+ wire should be 10 amps or less, and charging voltage should range between 13.2 to 14.8 volts. 1) With the voltmeter connected to battery, and key and engine off, record a "base" voltage reading. And the higher the temperature, the lower the charging voltage. The voltage should not be below 13.5 volts, which means you have a weak alternator, and over 14.5 volts is overcharging. it will bounce between 14 and 14.7, just enough to see it in the trucks lights and be annoying. A voltage drop test will assess voltage losses at the battery, the alternator and the starter. If the voltage is not within range, move on to the next step below. Voltage Regulator Test. When the voltage exceeds 14.5 volts, the regulator will stop supplying voltage to the field and the alternator will stop charging. Car batteries have a resting voltage somewhere between 12.45 and 12.6 volts in most cases. There are 2 brushes in the alternator, each one has a field terminal, one is labeled "FLD", the other is labeled "GND". This is how voltage output from the alternator If it is less than 12.4 volts, charge the battery and repeat the test. Although alternator manufacturers, rebuilders, and suppliers typically refer to the rated output in promotional materials, both the ISO and the SAE require a format of IL / IRA VTV, where IL is the low, or idle, amperage output, IR is the rated amperage output, and VT is the test voltage. Part 1: Battery. At idle, most charging systems produce 13.8 to 15.3 volts with no lights or accessories on. ok, i swapped in a 24 valve cummins into a 79 ford. the one thing i cant figure out is why after i did the swap, the alternator voltage "pulses". A car alternator needs to be putting out at least 13-14 volts (ideally between 13.8 and 14.2 volts) to effectively charge a 12 volt car battery.If the alternator is putting out too much voltage (15+ volts), it is likely your battery acid will boil over out of the battery. Diagram #1 shows the basics of the early alternator / voltage regulator (VR) design. In a nice, 70 F (21 C) day, you can expect a voltage regulator charging your car's battery at about 14.2 volts. A bad alternator wire or corroded battery terminal can prevent the current from flowing properly. VOLTAGE & CURRENT CHECKS. Charging voltage can vary between 13.5 and 14.8 volts, depending on ambient temperature.
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