![]() On top of that I don't even know if it is all wired correctly (see above pictures). Here are some pictures showing the questionable wiring and other things:Ĭan anyone offer some advice and/or pictures of a correct setup? All of the variables here make this a very frustrating problem i.e., there are regulators with 5-blade or 6-blade connectors (and they will both physically plug into the same mating connector) there are regulators intended for 40-amp and 55-amp alternators then there are of course 40-amp and 55-amp alternators and there are LEF and FEN plug configurations. I have ordered a new Nippondenso regulator which corresponds to the same Toyota part numbers that the VR756 does but I'm concerned about the wiring and I am also concerned about not knowing for sure exactly which alternator I have, and exactly which regulator I need. This is for the 55 amp alternator (I don't know if my alternator is 55 amp or not, but apparently the mechanic thought so) and has a 5-blade connector. The regulator he used was an Autozone VR756, which corresponds to the Toyota part numbers 27700-3810-38113. I was told by the mechanic that the alternator's 3-pronged plug is LEF rather than the more common FEN. If I disconnect the regulator, the engine's idle speed increases and the voltage drops to a little over 12 volts. The voltage is way too high (about 16.5 volts) which makes the battery overcharge/bubble/leak. A mechanic replaced the alternator and regulator in my truck, and within a few weeks I was having issues.
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