259-5274 (2595274) — 24V Starter Motor Solenoid Relay (Magnetic Switch), specifically designed for C6.4 engines (such as those found in the 320D/323D series) to control the starter motor's high-current circuit.

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I. Core Specifications

Part Number: 259-5274 / 2595274

Official Name: SWITCH GP-MAGNETIC (Starter Relay)

Coil Voltage: 24V DC

Contact Capacity: 100A+ (High-current capacity dedicated to starter motors)

Physical Appearance: Cylindrical metal body featuring two heavy-duty copper terminals (for battery/starter connections) plus one 2-pin Deutsch waterproof connector (for control wiring).

Mounting: Bolt-fixed installation, includes mounting bracket.

Function: Uses a low-current signal (from the ignition switch) to control the starter motor's **100A+** main power circuit, thereby preventing contact burnout within the ignition switch itself.

II. Primary Compatible Models

Excavators: 320D, 320D GC, 323D (C6.4 Engine)

Loaders: 416D, 420D, 430D

Dozers: D6N, D6R, D7R

Engines: C6.4, 3304, 3306, 3406C

III. Alternative Models (Direct Interchangeable Replacements)

142-8858 (1428858)

9W-1077 (9W1077)

VI. Common Faults and Diagnostics

Fault Symptoms: No response when turning the ignition key to start; starter motor fails to engage (pull-in failure); intermittent starting failures.

Diagnostic Methods:

Coil Resistance: Approximately 50–80Ω at 24V.

Direct 24V Power Supply to Coil: Should produce a distinct "click" sound (indicating engagement), and the two heavy-duty terminals should show electrical continuity.

Inspection: Check the connector pins for oxidation/corrosion, and inspect the wiring harness for damaged insulation.

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