Electrical System Parts

Alternators, starter motors, central electrics units, front and rear lighting, battery boxes and isolators, switches, relays and wiring repair parts.

Features

A failing starter is confirmed by measuring voltage drop across the main cable, the solenoid and the earth strap while cranking, because a few tenths of a volt lost at a corroded terminal cranks exactly like a worn motor.
Alternator output is matched to the vehicle's electrical load, which rises with auxiliary equipment such as tail lifts and refrigeration.
Lighting units carry road approval marking, and mounting and connector must match the existing loom.
Battery box and isolator corrosion causes voltage drop that presents as a starter fault, so both are checked before the starter is condemned.
Repairs are made with correctly crimped terminals rather than twisted joints, because vibration finds every poor joint on a commercial vehicle.

Figure	Typical range	Unit	Why it matters
Component	alternator / starter / lighting unit / switch / relay		Identifies the line.
System voltage	24	V	Component compatibility.
Alternator output	80 / 100 / 120 / 150	A	Must cover the vehicle's electrical load.
Starter power	4.0 / 5.5 / 6.5	kW	Cranking capability for the engine size.
Supply form	new / remanufactured exchange		Cost and core return.