An automotive generator or DC dynamo is basically the predecessor of the alternator. Most cars these days are equipped with an alternator since this is more efficient and easier to maintain. However, older vehicles still use the former in order to charge the battery. If your car is still using this component, and you need to wire one to charge the battery, here's a guide on how to do just that. Once this component is properly wired, you'll have your car battery up and running in no time.
Step 1: Locate the battery.
Pop up the hood and find the battery. You'll then see two cables attached to the terminals: a black one (negative) and a red one (positive).
Step 2: Figure out your vehicle's ground type.
Cars can either be a negative-ground or positive-ground type. Keep in mind though that many old vehicles are a positive ground. This means that the red or positive cable is linked to a metal engine part. Your car is a negative ground if the red positive cable is connected to the starter motor.
Step 3: Disconnect the battery cables.
Using a wrench, disconnect the battery cable that's linked to a metal component of your vehicle. Then disconnect the other battery cable from the terminal. Make sure that the cables are far away from the terminal ports. Once you've removed these two cables, look for the other two or three cables that connect the battery to the generator. These wires are usually composed of a black cable, a red cable, and a thin, third one that can come in a variety of colors. The color of the third cable depends on your car make and model.
Step 4: Familiarize yourself with the generator.
Look at the back of this part, and you should see two or three terminals that have nuts and bolts threaded onto them. One terminal should be labeled as .Gnd,. the other one .Bat. or .B,. and the third one is labeled as .Ign..
Step 5: Attach the battery to the DC dynamo.
If your car is a positive ground, connect the battery by attaching the red cable to the .Gnd. terminal. Then attach the black cable to the .B. or .Bat. terminal. If your car is a negative ground, then just do the opposite: attach the red cable to the .B. or .Bat. terminal and the black cable to the .Gnd. terminal.
To attach the red and black cables, use a wrench to remove the nut from each of the corresponding generator terminal. Then coil the metal loop over the end of the battery cable. Once the battery cable is securely looped, reattach the nut and tighten it in place with the wrench.
Step 6: Attach the third or last cable (if any).
If the generator has a third terminal, attach the third wire to it by removing the nut and looping in the cable. Don't forget to tighten the nut back in place.
Step 7: Reconnect the battery cables to the battery terminals.
Locate the first two battery cables you've disconnected earlier. If the red cable was linked to a metal part (positive ground), reconnect the black cable first to the negative terminal then link the red cable to the positive terminal. If your vehicle is negative ground, just do the opposite.
Close the hood and switch on the ignition. Your battery is now being charged by the DC dynamo.