How Much Voltage Is Too Much From An Alternator

Had just drove it around the block with battery only no alternator all went well. Recently installed a dual quad Sniper setup on my 69 Hemi Roadrunner. My suggestions are as follows.

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The alternator relies on the voltage regulator to know how much electricity it needs to generate.

How much voltage is too much from an alternator. 156 V will probably not do it but ECUs and parts of them have failed from over voltage. The amperage output is usually listed as the maximum output of the alternator. A car alternator needs to be putting out at least 13-14 volts ideally between 138 and 142 volts to effectively charge a 12 volt car battery.

Thats clearly not right. This is enough to destroy the cars battery and electrical system. If this is the case it only means that the alternator is not charging but does not reveal why.

The FSM states if the voltage is anything between 133 and 15 volts a warm alternator is functioning properly. A car alternator needs to be putting out at least 13-14 volts ideally between 138 and 142 volts to effectively charge a 12 volt car battery. A car alternator needs to be putting out at least 13-14 volts ideally between 138 and 142 volts to effectively charge a 12 volt car battery.

Next turn on the engine and recheck the voltage. Too much voltage from alternator. To differentiate an alternator problem from the battery you will need to use a voltmeter to check for voltage.

If the alternator is putting out too much voltage 15 volts it is likely your battery acid will boil over out of the battery. Basically the voltage regulator controls field current through the rotor inside the alternator in order to control alternator output. Sounds more to me like they just didnt want to deal with it.

I purchased a 1999 RAV4 about 15 years ago for my college student. Wirring not messed with. The regulator can fail but so is the bearings and brushes etc.