Quick Answer

Quick Answer: Are 1 wire alternators good?

One-wire alternators aren’t necessarily “better” than typical alternators of similar quality, the big benefit is the ease of installation.

What is the purpose of a one wire alternator?

Whether using a one-or three-wire alternator, its function is to recharge the battery. As lights and other accessories draw current from the battery, energy is replenished by the alternator.

How do you convert an alternator to a one wire alternator?

It’s simple! The only thing you need to hook up on a one-wire alternator is a charge wire from the terminal on the alternator to the positive terminal on the battery (or any positive battery source). The external regulator can either be totally dismantled from the firewall or left in place.

What is the difference between 1 wire and 3 wire alternator?

Where the 3 wire will charge as soon as it starts turning. This has to do with field current signal. The one wire , once charging will continue to charge when the engine comes back to idle, it’s just the first time you start it that it has a problem.

Does a one wire alternator need a voltage regulator?

The only thing required to electronically hookup a one wire alternator is to run a charge wire from the battery terminal on the alternator to the positive terminal on the battery (or any positive battery source). The external regulator can be either totally removed from the firewall or left in place.

Does a 1 wire alternator need to be grounded?

Being a true one-wire alternator means having a solid ground and an ample wire attached to the battery is all that’s needed to keep that battery charged.

What is the difference between a one-wire and two wire alternator?

A one-wire alternator doesn’t use the two-wire connector which supplies electrical current to facilitate use of the idiot light. The two-wire connector houses the exciter wire, which is responsible for turning off the in-dash light.

How many volts should a one-wire alternator put out?

The voltage regulator for the “ONE-WIRE” system gets the voltage reading from within the alternator, and it will maintain the alternator out-put terminal at about 14.2 volts.

What is a self excited alternator?

A self-excited brushless alternator having a rotating field excited by an alternating current exciter whose armature rotates with the field winding of the alternator and is permanently connected to that winding by a rotating field rectifier.

Can you use a 3 wire alternator to 1-wire?

The answer is no. You can leave off the sense wire (it will sense internally) but you need the exciter wire (switched +12 to the field). This would be a 2-wire setup.

What is a 12SI alternator?

The “SI” in the model number stands for Systems Integrated, meaning that the voltage regulator is inside of the alternator. these alternators have a built-in voltage regulator. 10SI and 12SI are Delco Remy model number designations, but not part numbers.

What are the 3 wires for on a 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.

How do I know if I have a 1 wire alternator?

It has one wire that connects the charge terminal directly to the battery or a 12V source. They are internally regulated and grounded through the block. 1-wire alternators will not have a way to hook up a warning light, but most custom applications work well with a voltage gauge in its place.

Do I need to ground my alternator?

The alternator is grounded to the engine block by its mounting points so the engine block itself becomes an electrical ground distribution block. You just need to find a suitable bolt to secure your additional ground wire. You can add a wire from the chassis of the car to the engine block.

What are the two small wires on an alternator?

Exciter wire is connected to the L terminal of an alternator and is used to turn on the voltage regulator. Excitor wire is needed to generate the voltage required for the alternator to start running. The positive and negative cables are small and connected to the respective terminals of the battery.

Can you wire alternator directly battery?

Can I Straight Wire My Alternator Directly To Battery? You will need to attach a cable directly to the positive side of the battery from the alternator output post. When heavy electrical demands are placed on the alternator, this allows the alternator to produce full output from the battery.

Will an alternator charge in both directions?

The alternator will work in either direction but the fan has to be matched to the direction of rotation so that it blow air INTO the alternator.

Where does the alternator exciter wire go?

Voltage goes through the light and down the exciter wire to the alternator. The wire is connected to the “L” terminal of the alternator. The exciter wire is used to turn on the voltage regulator.

Where do you ground a single wire alternator?


Simply run one wire from the alternator ‘battery’ terminal to the positive terminal of the battery or to the starter solenoid main lug, which is connected to the positive battery post.

What is the S terminal on an alternator?

S terminal – Senses battery voltage. IG terminal – Ignition switch that turns the voltage regulator on. L terminal – Closes the circuit to the warning lamp. B terminal – Main alternator output terminal (connected to the battery)

How do you hook up an alternator to a battery?

Alternator DEMO Wiring, connection to Battery, Capacitors, Inverter …

How many amps is a one wire alternator?

JEGS 1-Wire GM Alternator | 140 Amps Output | Made In USA | Chrome Finish | Includes Single Groove V-Belt Pulley, And Turbo Fan | Internal Regulator | 12 Volt | GM 12si.

How do I increase the voltage of my alternator?

Selecting different sized diodes can alter the output regulation of the alternator. A smaller diode will increase the charge voltage by more than a larger diode (due to the voltage drop varying with the diode current).

Is 14.8 volts too high for alternator?

14.8 would start to be a worry (there might be liquid or corrosion on the battery) and 15 volts would be a real concern, but 14.6 is fine. Less than 14.3 would be a “weak” alternator or regulator. Much less than 14.2 at a fast idle is bad wiring, bad alternator or regulator, or a bad connection or fuse link.

What is brushless alternator?

A brushed alternator uses carbon brushes to help conduct electricity, while a brushless alternator uses two sets of rotors that spin together to generate and transfer the electrical current. Brushless motors are typically more efficient than brushed alternators, running in self-control mode.