![]() If your alternator stops generating current when the ignition is on and the engine is running, you back to the first scenario. There is no net voltage drop across the bulb so it does not light. Since the alternator is turning, you also have battery voltage on the exciter wire from the alternator. When the engine is running, you have battery voltage on the POWERCELL side of the light. Current flows through the light and turns it on. Without the engine running and the alternator turning, there is no voltage on the alternator side. When the ignition is on, there is 12-volts on the POWERCELL side of the light. The orientation of this diode is critical, check the diagram for more details. Without this diode, the engine will continue to run even though you have turned off the ignition output. This diode blocks current from feeding back into the ignition system. You also need to install a diode on the POWERCELL side of the light. The other end of the light connects to the exciter terminal on the alternator. One end of the charge light connects to the output of the POWERCELL that is powering the ignition in the car. This is where the charge light gets connected into the system. Usually, this is a direct connection from the alternator output back to the sense terminal. Check the manual that came with your alternator. Read this blog post for more information. If the alternator is ever disconnected from the battery when it is charging, you get something called a load dump and that’s a bad thing. You should never install a disconnect switch between the alternator and the battery. It is very important to make sure that nothing interrupts this feed to the battery. This is how the battery gets charged when the engine is running. Here are the important parts of this diagram.įirst, you need to connect the alternator directly to the positive terminal on the battery. Picture of wiring diagram showing how to connect 3-wire alternator to the Infinitybox system. Please refer to the manual and wiring diagram that came with your alternator for more specific details. The following diagram shows the wiring for a typical 3-wire alternator connected to our Infinitybox system. This is what excites the field of the alternator. You connect the output of the alternator back to this terminal so that it can sense and regulate the output voltage. There are two smaller terminals, usually spade terminals on the top of the alternator. This is the main current feed that charges the battery and powers the car when the engine is running. The first is the large lug that connects to the battery. Most cars originally came with a 3-wire alternator.Īs its name implies, the 3-wire alternator has three electrical connections to it. One of those choices is between a 1-wire and 3-wire alternator. When guys are updating their electrical systems in their cars, they have lots of choices. Thanks for the help.Here’s a quick blog post showing you how to wire a 3-Wire Alternator with our Infinitybox system. Why are the two field poles not marked specifically when they are obviously not the same?Īutomotive electrical is a huge weak spot for me. Why two blue wires instead of one on the old harness? Having melted the wires before, I don't want to make the same mistake again. The diagram says both go to field, but doesn't specify which. Now I've got the new wiring harness, and there are two blue wires going together into one connector, the lone green, and of course the battery wire. I replaced it, switched the wires, and no more problems. That's what my old harness was like, except when I hooked up the alternator wires with the old motor, I must have had the blue and green wires backwards, because it melted the wire. The wiring diagram shows a dark green wire going to field, and a dark blue wire goes to field, and then the battery wire(black)gets pinched between the two nuts. I ordered a new engine wiring harness from Classic Industries. This is likely the first of a few questions regarding wiring up my 1970 Satellite now that the 440 is in.
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