If the cranking voltage dips below 9.6 volts, recharge or replace the battery as required before proceeding with the alternator test. Next, disable the fuel pump and crank the engine with a voltmeter connected in parallel with the battery terminals. First, turn off all accessories such as exterior lighting, HVAC blower and high-amperage components like the rear-glass defogger. In any case, consult your service data before assuming that an apparently low or high charging voltage is incorrect for the system in question.īattery Testing Photo 1: This 10.64 battery cranking voltage is well above Toyota’s threshold of 9.6 volts, which means the battery isn’t causing the charging system problem.Īccording to Toyota, a dynamic battery state of charge (SOC) and state of health (SOH) test can be performed with the aid of a simple voltmeter. During cold weather, charging voltage can increase into the 15-volt range to compensate for reduced chemical activity in the battery in sub-freezing temperatures.
As underhood or ambient temperatures increase, the charging voltage is reduced to about 13.8 volts or less to prevent boiling the water from the battery electrolyte. For example, at 70° F, the voltage regulator charges the battery at approximately 14.2 volts. While charging voltage specifications vary according to application, the voltage regulator generally adjusts battery-charging voltage according to ambient air temperature. Most Toyota charging systems integrate their voltage regulators into the alternator assembly.
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