The second wire of the pair on Pin 2 of the alternator goes to the ignition. This permits power to begin flowing through the alternator as well as the other components of the car.
What does the small wire on an alternator do?
The voltage sensing wire connects to the battery, and the ignition wire connects from the alternator to the key switch. All of these wires pull power from the battery through the alternator to keep the electrical systems running and the car operating.
Which wire is the exciter wire on an alternator?
The wire is connected to the “L” terminal of the alternator. The exciter wire is used to turn on the voltage regulator. This wire, when unplugged, should have approx. 12.5 volts with the key on.
What are the terminals on an alternator?
A key to identifying your alternator terminalsTerminalDefinitionNotesNNeutralCentre point of a Y-connected statorPPulseStator connection for tachometerRRelayOutput to charge relays, etcSSenseBattery Voltage sense wire17 more rows•13 Dec 2018
Where do the 2 wires on alternator go?
If the voltage rises above or falls below 12 Volts, the alternators internal voltage increases or reduces power output to maintain 12 Volts to the battery and the systems of the vehicle during operation. The second wire of the pair on Pin 2 of the alternator goes to the ignition.
Does alternator need excitation?
Without the excitation system the AC alternator would have no way of building its voltage as it starts to rotate, nor would not be able to regulate its voltage to the pre-set nominal level while running at its rated speed. So, without an excitation system, an AC alternator would be useless for its purpose.
What does S and L mean on alternator?
S terminal - Senses battery voltage. L terminal - Closes the circuit to the warning lamp. B terminal - Main alternator output terminal (connected to the battery)
How do I wire a 3 wire alternator?
How To Wire A 3-way Alternator On A Tractor?Disconnect The Negative Terminal From The Tractor Battery. Fabricate Mounting Brackets For The Alternator. Connect The Output Bolt To The Positive Terminal Of The Battery. Connect The Battery Negative Cable. Disconnect The Battery Negative Terminal.More items
How much current does it take to excite an alternator?
The maximum output from your alternator should be regulated to between 14.1 and 14.4 volts DC. The voltage regulators job is to supply voltage to the battery when its not at the nominal level.
What is self excitation in alternator?
a kind of excitation of generators where the magnetic field of the main poles is excited by a current supplied to the windings of the main poles from the armature (rotor) winding. Self-excitation is made use of most often in DC generators.
What does D+ mean on an alternator?
warning light connection D+ is the warning light connection ( without which it will probably not function) D- is the battery negative connection.