Can I wire my alternator directly to my battery?

Asked By: Quinti Limoo | Last Updated: 11th February, 2020
Category: automotive auto parts
4.4/5 (7,043 Views . 25 Votes)
Just run a direct cable from the battery to the alternator. Make sure it's at least 4 gauge cable. I would be carefull I believe that Nissan alternators are externaly regulated. If you try to run a cable directly to the alt you risk cooking the battery as well as frying the entire electrical system.

Click to see full answer

Consequently, what wires go to alternator?

The three wire types in a three-wire alternator include the battery positive wire, the voltage sensing wire, and the ignition input wire. The battery positive wire connects to the starter. The voltage sensing wire connects to the battery, and the ignition wire connects from the alternator to the key switch.

Subsequently, question is, what are the two small wires on an alternator? The two wires connected to the alternators are the positive and negative cables. When connecting our alternators use Fig 2 to properly connect these alternators. A jumper wire is supplied to connect the alternator (S) terminal to the (B+) terminal.

In this way, is there a fuse between alternator and battery?

#3 – Blown Fuse There are certain models of car which have alternators dependent on a particular fuse to operate. However, these fuses can blow due to a power surge or simply from old age. Once that happens, the alternator will no longer charge the battery.

Can you power a house with a car alternator?

You can use car alternators to power a home. One method of doing this is to use the alternators to recharge storage batteries. These batteries could then be used to power an inverter, which would produce the AC voltage needed to run the house. As the gas engine runs, it will recharge the battery.

39 Related Question Answers Found

What is the plug on alternator for?

This plug along with the 10AWG hot wire to your battery is all you need to connect your alternator into your vehicle. There is a diode located in the white feed wire to prevent voltage feedback and also allows shutting off engine in older vehicles.

What does the exciter wire do on an alternator?

An alternator is an auto part that transmits power from the fuel system to the battery for operating vehicle accessories, such as the radio, headlights and air conditioning fans. A wire called an exciter generates the voltage needed for an alternator to start working once a vehicle is started.

Can you use a car alternator for wind turbine?

DIY Wind Turbine. Turn a car alternator into alternative energy by building this cheap and easy homemade wind generator. If you can turn a wrench and operate an electric drill, you can build this simple generator in two days. You can use any vehicle alternator with a built-in voltage regulator.

What does R and F mean on an alternator?


The R and F terminals are the 'Reference' or voltage sense terminal and the 'Field' terminal.

What does W mean on an alternator?

Volvo penta marine engine, the alternator has B+, B- terminals , I'm told these are battery + and - . W is tachometer (?)

Where does the alternator ground wire go?

The body of the alternator is ground. The alternator is mounted on the engine and the engine should have a ground strap to the frame. From the frame there is a ground strip to the battery. That's a long way for a ground circuit.

How do you wire an alternator with an external regulator?

How to Wire an Alternator Voltage Regulator
  1. Open the hood of your car.
  2. Remove the black battery cable from the car's battery terminal using a wrench.
  3. Locate the voltage regulator.
  4. Find the multi-wired harness nearby the alternator and voltage regulator.
  5. Insert the plug into the socket on the voltage regulator.

Does an alternator have a ground wire?

The last wire that will need improvement is the ground wire from the battery to the engine block. The alternator is grounded to the engine block by its mounting points so the engine block itself becomes an electrical ground distribution block. You can add a wire from the chassis of the car to the engine block.

Why is my alternator not charging my battery?


A bad battery cell can cause the alternator to over-charge the good battery cells. Check for a bad alternator voltage regulator and circuit. Check the alternator rectifier or have your alternator checked at the auto parts store.

How do you wire the alternator light?

To wire a warning light using one of these alternators, simply remove the terminal plug cover and connect the R (Left terminal, looking from the back of the alternator) to the warning light wire. In order for an alternator to charge properly, an alternator must be grounded to the engine block.

How do you check an alternator with a screwdriver?

Turn the ignition key to the “on” position, but do not start your car. The dashboard warning lights lights illuminate and the voltage regulator is activated. Repeat the test using the screwdriver. Place the metal end of the screwdriver near to the nut on the alternator pulley.

Does an alternator need a fuse?

Fuses are installed to protect wires from an overload, meaning that the draw (amps) from the load (appliance) exceeds the capacity of the wire (the size or gauge). Under this premise, the only way an alternator needs a fuse is if either the battery or the alternator itself experiences a dead short.

What would cause a good alternator not to charge?

Worn out or Damaged Alternator
The most common reason why your car is not charging is actually because of a worn out or damaged alternator. You can carefully tap it with a hammer while the car engine is running while checking it with a multimeter to see if the voltage is changing.

What are the signs your alternator is going out?


Six Alternator Warning Signs:
  1. Dim lights. The alternator is part of the electrical system of your vehicle.
  2. Warning light. Most modern cars have a dashboard warning light that alerts you when the alternator is on the fritz.
  3. Weak or dead battery.
  4. Weird smells.
  5. Odd sounds.
  6. Visual cues.

Can a car run with a bad alternator?

When an alternator is going bad, the battery drains quickly. If the alternator is going or has gone bad, in most cases the vehicle can be driven for a short distance and for a short period of time, allowing you to make it to a service station or automotive parts store for a replacement alternator.

What causes an alternator to fail?

Bad diodes are a common cause of alternator failure. The diodes are part of the rectifier assembly that converts the alternator's AC output to DC. A leaky diode also can allow current to drain out of the battery through the alternator when the vehicle is not being driven.