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RTC5670 - Regulator & Brush Assembly Electrical Part Land Rover Range Rover Defender, Discovery, Range Rover

RTC5670 - Regulator & Brush Assembly

- €19,90
€19,90
€19,90 - €19,90
€19,90
Aftermarket Part
Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.
Regulator & Brush Assembly - the combined voltage regulator and brush box fitted to Lucas alternators in the charging circuit.

The unit mounts at the slip-ring end of the alternator, beneath the plastic end cover. It carries the carbon brushes that feed field current to the rotor slip rings, together with the solid-state regulator that holds charging voltage at the correct level regardless of engine speed or electrical load. Brushes wear down against the slip rings over time and the regulator is a sealed electronic module, so the two are supplied and replaced together as a single assembly rather than repaired.

Worn brushes or a failed regulator typically present as no charge at all, intermittent charging, or a battery that is persistently over- or under-charged. The assembly can be changed with the alternator on the bench or in situ, without dismantling the rotor or stator.
Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994
Fitment Notes DEFENDER 1987-2006 — regulator & brush box for Lucas alternator; 2.5 NA/Turbo Diesel, 200Tdi, 2.5 Petrol, 3.5 V8 Petrol (with & without A/C)
DISCOVERY 1 1989-1998 — 200Tdi, 3.5 V8 Twin Carb, Lucas A127 V8 EFI
RANGE ROVER CLASSIC 1986-1994 — various alternators incl. Lucas A127 (RRC to VIN HA610293 and from JA610294)
Alternative Codes
RTC5670RTC5044RTC5370

Available to order 2–3 weeks

Not currently in stock. Order now — typically ships within 2–3 weeks.

Need it faster? Contact us about express import (2–5 business days).

When will my order arrive?

This item is ordered from our supplier on request. Typical lead time is 2–3 weeks from order confirmation.

  • Netherlands / Belgium / Germany: 2–4 working days after dispatch.
  • Other EU countries + UK: 4–8 working days after dispatch.
  • Outside EU/UK: contact us for an estimate.

Need it faster? Express import available in 2–5 business days — contact us before ordering.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the RTC5670 regulator and brush assembly?
The RTC5670 is the voltage regulator and brush box for Lucas alternators. It controls charging voltage and carries the brushes that contact the slip rings. It fits Lucas units on the Defender, Discovery 1 and Range Rover Classic.
Which alternators does this regulator fit?
The RTC5670 suits Lucas alternators including the A127 fitted to the Defender, Discovery 1 (200Tdi and 3.5 V8) and Range Rover Classic. It also replaces the alternatives RTC5044 and RTC5370. Check your alternator is a Lucas type before ordering.
What are the signs the regulator or brushes have failed?
Worn brushes or a failed regulator typically cause under-charging, over-charging or intermittent charging on the Defender and Discovery 1. Fitting the RTC5670 regulator and brush assembly restores steady voltage without replacing the whole Lucas alternator.