SEAL 4V2444 - Caterpillar

Introduction
For Specifications with illustrations, make reference to Specifications for 3406C Industrial & Marine Engine Attachments, SENR6527. If the Specifications in SENR6527 are not the same as in the Systems Operation, Testing & Adjusting, look at the printing date on the cover of each book. Use the Specifications given in the book with the latest date.Wiring Diagrams
Many types of electrical systems are available for these engines. Some charging systems use an alternator and a regulator in the wiring circuit. Others have the regulator inside the alternator.A fuel or oil pressure switch is used in all systems with an external regulator. The switch prevents current discharge (field excitation) to alternator from the battery when the engine is not in operation. In the systems where the regulator is part of the alternator, the transistor circuit prevents current discharge to the alternator and the fuel or oil pressure switch is not required.All wiring schematics are usable with 12, 24, 30 or 32 volts unless the title gives a specific description. Wire and cable shown dotted on wiring diagrams is to be supplied by customer. The charts that follow gives the correct wire sizes and color codes. The abbreviations given below are used with the wiring diagrams in this section.The present type of wire identification, used on all Caterpillar equipment uses only eleven solid colors. In addition to only eleven basic colors of wire, a circuit number is stamped (put) on each wire. The circuit number is stamped approximately every inch for the length of the wire. The identification number for a circuit will be the same for any Caterpillar equipment.For example: A color code of "A701-GY" on the schematic would mean, there is a gray wire with the circuit number "A701" stamped on it. This wire is the solenoid signal wire (power) for cylinder #1 (CYLINDER HEAD SOL 1) on the Electronic Unit Injector (EUI) system wire harness. The "A701-GY" color code will be the identification of "SOLENOID 1 POWER" circuit on all Caterpillar equipment wire harnesses with Electronic Unit Injector (EUI) systems.Another wire identification on the schematic is the size of the wire. The size or gauge of the wire is called "AWG". The gauge of the wire will follow the wire color.For example: A color code of "150-OR-14" on the schematic would indicate the "150-OR" wire is a 14 AWG wire.If the gauge of wire is not listed after the wire color, the gauge of the wire will be 16 AWG. Grounded Electrical Systems
These systems are used in applications when it is not necessary to prevent radio distortion and/or chemical changes (electrolysis) of grounded componentsRegulator Inside Alternator
Charging System
(1) Ammeter. (2) Alternator. (3) Battery.
Charging System with Electric Starting Motor
(1) Start switch. (2) Ammeter. (3) Alternator. (4) Battery. (5) Starting motor.Regulator Separate From Alternator
Charging System
(1) Ammeter. (2) Regulator. (3) Pressure switch (N/O). (4) Resistor (used with 30 and 32V