Product Specifications

I. Product Overview

The 24V H4 (P43t) is a dual-filament high/low beam integrated halogen headlight specifically engineered for medium/heavy commercial vehicles. Featuring the ISO-standard P43t three-prong metal base and 24V voltage system, it delivers reliable all-weather primary lighting for trucks, buses, construction machinery, and other commercial vehicles.

II. Key Features

1. Commercial Vehicle Electrical Design

• 24V Voltage System: Perfectly matches dual-battery series circuits in diesel vehicles, preventing brightness loss or premature failure due to voltage mismatch

• Independent Dual-Filament Control: Low-beam filament (typically 60W) with dedicated shield creates anti-glare cutoff line; high-beam filament (typically 70W) provides long-distance focused illumination

• Heavy-Duty Construction: Thickened quartz glass envelope with vibration-resistant filament support system

2. Professional Optical Performance

• Precise Light Distribution: Strictly calibrated filament positioning ensures ECE/SAE compliant cutoff pattern in original reflectors

• Environmental Adaptation: Standard UV-resistant coating prevents polycarbonate lens yellowing

• Thermal Management: Optimized gas mixture balances brightness and lifespan

3. Enhanced Durability

• Three-Prong Metal Base: P43t base provides 360° stable contact with anti-oxidation plating

• Vibration Resistance: Spring-loaded contact system adapts to unpaved road conditions

• Sealed Design: OEM-grade rubber gasket achieves IP6K7 protection rating

III. Installation Guidelines

1. Voltage Verification: Confirm vehicle uses 24V system (most 6+ cylinder diesel engines)

2. Base Alignment: Three-prong base has foolproof design; align and rotate clockwise to lock

3. Seal Inspection: Ensure waterproof gasket fully seats in socket groove after installation

4. Beam Adjustment: Realign headlight aim after replacement to maintain proper cutoff position

IV. Vehicle Applications

• European Trucks: Mercedes Actros/Axor, Volvo FH/FM, Scania G/R series, MAN TGX/TGS

• Asian Trucks: Hino 700 series, Isuzu Giga, Mitsubishi Super Great

• Chinese Heavy Trucks: FAW J7/J6, Dongfeng Tianlong KL, Sinotruk HOWO T7H

• Special Vehicles: Fire trucks, concrete pump trucks, mining dump trucks

V. Professional Notes

• Legal Compliance: E-mark certified for European markets; SAE compliant for North America

• Maintenance Interval: Recommended replacement at 300-350 operating hours

• Safety Warning: Never install 12V H4 bulbs in 24V systems (causes immediate burnout)

• Performance Tip: Clean electrical contacts with contact cleaner before installation