New Denso Alternator Not Charging (FIXED IT!)

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solved the common Mopa low voltage at idle problem

I picked up a Denso alternator in the wrecking yard (Toyota 4Runner unit) and fabricated a mount to hang it from my motor plate. (I'm not selling these motor plate mounts so this isn't a for sale ad.) For the first time ever, the lights do not dim at idle. The Denso alternator is a 60 amp unit and it puts out a lot of amps at idle. My amp gauge showed 10 amps of output at 850 rpm (motor rpm). Voltage is 14.4 volts at idle with the headlights off, 14.2 with the lights on, 14.2 with high beams on.

The Denso alternator is 6 lbs lighter than the Mopar unit and is internally regulated. So one more thing gone from the firewall. I just ran the 12 volt source line that used to go the voltage regulator all the way to the alternator. Had to add one sense line so the alternator can "see" what hte voltage bus is at. This line I ran to the starter relay stud since that is where the BAT connects to as well as several other 12V sources.

AndyF

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This is the way I installed mine, Toyota Denso that is. I have checked and rechecked, tested wires, you name it, all my wiring, but it still will not charge. The volt meter stays right on 12 volts. While the engine was running I tested all the wires which were right about 12 volts, I thought maybe my volt meter went bad. I even took the alternator off and had Autozone test it. It passed! I wish I knew this electrical stuff.

Someone please answer me this: Looking at the back of the alternator, where the three spades are, the one on the right is the ignition, the left is the lamp, the top is the sense. Correct? I'm not using the three wire plug. I have them wired individually.

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...Someone please answer me this: Looking at the back of the alternator, where the three spades are, the one on the right is the ignition, the left is the lamp, the top is the sense. Correct? I'm not using the three wire plug. I have them wired individually.

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Going by Andy's tech archive post, you have the ign and lamp connections backwards.

Edit: your quicker than i am lol
I assume that is looking at the back of the alt.

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...Someone please answer me this: Looking at the back of the alternator, where the three spades are, the one on the right is the ignition, the left is the lamp, the top is the sense. Correct? I'm not using the three wire plug. I have them wired individually.

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Going by Andy's tech archive post, you have the ign and lamp connections backwards.

Edit: your quicker than i am lol
I assume that is looking at the back of the alt.

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