PFA Battery Isolator Master Switch Classic Models Genuine Lucas Heritage
£48.70
Product Info
PFA Battery Isolator Master Switch Classic Models Genuine Lucas Heritage
Aston Martin Genuine Lucas Heritage Battery Isolator Master Switch (DB2 to AMV8)
Protect your vehicle’s electrical system and safeguard your battery during storage using the PFA Genuine Lucas Heritage Battery Isolator Master Switch. We supply this original equipment-quality switch as a direct replacement, featuring authentic Lucas construction, full continuous current rating, and the factory-correct integral clock terminal to maintain auxiliary power when switched off.
Product Overview
Aston Martin fitted this master battery isolator across decades of heritage production, making it a critical safety and maintenance component. It allows drivers to immediately isolate the electrical system, preventing battery discharge during lay-up, reducing the risk of electrical fires, and providing security when leaving the vehicle unattended.
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Vehicle Compatibility: Aston Martin installed this switch across classic models spanning three decades, from the DB2 era through to the late V8 models (up to 1985):
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Aston Martin DB2, DB2/4, DB4, DB5, DB6 & DB6 Mk2
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Aston Martin DBS6 & DBS V8
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Aston Martin AM V8 (up to 1985)
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Electrical Capacity: The unit handles 150A continuous current and provides a 500A momentary surge capacity. Furthermore, it includes the correct integral clock terminal to keep interior timekeeping alive while you isolate main vehicle power.
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Quantity: This listing covers a single item (sold individually).
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Quality: Genuine Lucas Heritage production delivers an authentic body style, precise terminal layout, and period-correct dash aesthetic.
Technical Specifications
| Attribute | Detail |
| Part Type | Battery Isolator Master Switch |
| Manufacturer | Genuine Lucas Heritage |
| Continuous / Surge Rating | 150A Continuous / 500A Momentary |
| Features | Integral Clock Bypass Terminal |
| Original Part Number | 20-37-112 (Note: DB5 catalog lists 22.37.238) |
| Our Part Number | PFA-20-37-112-R |
| Package Quantity | 1 (Individual) |
Parts Book Reference Guide
You can easily cross-reference this component in your official Aston Martin parts catalogues and workshop manuals:
| Model | Parts Catalogue / Publication | Page | Item Number |
| DB4 | Plate Y | Page 88 | Item 35 |
| DB5 | IGA112 | Page 6-9 | Item 24 |
| DB6 & DB6 Mk2 | Section 6 | Page 6-13 | Item 10 |
| DBS6 | DF890 | Page 6-15 | Item 15 |
| DBS V8 | DF8801/4/71 (DBS V8) | Page 6-12 | Item 15 |
| AMV8 | TP5078-I-1190-150 | Page 6.3A.2.1 | Item 17 |
Why Choose Our Genuine Lucas Battery Isolator Switch?
Over time, vintage battery switches suffer from internal contact pitting, high electrical resistance, and erratic continuity. A faulty master switch causes intermittent starting issues, voltage drops, or total electrical failure. Consequently, replacing your worn switch with a Genuine Lucas Heritage unit ensures authentic cockpit optics, crisp contact engagement, and maximum power delivery to your starter motor.
Need assistance with your electrical restoration? We specialize in supplying authentic and precision-engineered components for classic Aston Martin models. If you need help verifying your electrical schematic or cross-referencing parts for your restoration, please contact our team for expert guidance.
Parts For Astons is an independent business dedicated to providing high-quality parts primarily for Aston Martin vehicles. Our expertise stems from years of passion and experience with Aston Martins from restoration and race preparation (and everything inbetween), ensuring every part we offer meets the exacting standards of these iconic vehicles.
We manufacture our own parts using our own designs which are developed in-house and rigorously tested before going to market. This enables us to manage our own quality control to ensure you receive a part which is 100% fit for purpose. If we do not have a part in stock, we can manufacture it quickly.
Closely associated with Goldsmith And Young, you can trust in our commitment to quality and personalised service for your restoration or performance needs. Should you have any questions, please do not hesitate to reach out and ask.
Additional information
| OEM | 20-37-112 |
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