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The voltage regulator in the alternator has a rectifier circuit with diodes. When one of the diodes burns our the alternator emits EMP's (electromagnetic pulses) Which are picked up in your speed sensor wiring. These EMP's confuse the transmission computer and causes all sorts of trouble. If left unrepaired, and you continue to drive it, You may damage the transmission.
Furthermore, the voltage regulator controlls the current to the transmission solenoids. It can cause them to be underpowered (malfunctioning) or overpower them to damage them.
In an Isuzu rodeo with an American transmission(4L30E), using an aftermarket alternator (wrong voltage regulator in it) can burn out the Bosch electronic transmission control unit(TCU). The max voltage is set too high. The Max voltage output should be 14.2v. with lights on, A/C on and all accessories running.
There's more. But you get the idea.
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∙ 12y ago
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