Notice: Undefined index: in /home/bonnick91/public_html/catalog/controller/extension/module/paypal_smart_button.php on line 33 PBOX00108 - Alternator Regulator - Single phase 12 volt, positive or negative earth

Production delays

Due to a unexpected terminal diagnosis, I am now required for care, 24/7, this has a massive impact on production capacity, due to this I am only selling from stock. I will get to all emails as soon as I can however there is likely periods of communications delays
Thank you for your understanding at this time difficult time.

Here you have a Brand new Boyer Bransden power box, this kit is designed for bikes with fitted with a single Phase Alternator, running on a 12 volt positive or negative earth set-up


Why fit a power box?

  • More stable voltage protecting from overcharging (with battery fitted), replacing the need for a Zennor Diode.
  • Works with Electronic or standard ignition set-ups
  • Easy 6 to 12 volt conversion 
  • Save weight
  • improve lighting


Power Box is a self regulating rectifier with an internal current and voltage storing capacitor.

Connecting directly to the alternator, the output is approximately 15 volts with no current being drawn and 14.5 volts with some load. These values are just right for charging a 12 volt battery or running the electrics direct.

The unit has been designed using the latest power technology semi-conductors to provide stable, direct current from standard permanent magnet alternators.

Three types are available: Single phase, Bi phase and Three phase.
Some are available with a charging lamp control, or lighting delay circuit, which prevents the lights being turned on until after the engine is started.

Ensure you have the desired unit before fitting, Single phase and Bi phase units control 200 watts and three phase units control 300 watts.

As a rule of thumb Single phase power boxes are suitable for use with most British Bikes, pre 1975 with alternators two, or three wire. Bi phase are suitable for use with most Italian and French machines equipped with three wire alternators. Three phase will suit some British machines post 1975 with three wire alternators and the majority of Japanese three wire machines.


This item is made by Boyer Bransden electronics LTD.

Please direct any technical questions directly to them

PBOX00108 - Alternator Regulator - Single phase 12 volt, positive or negative earth

  • Product Code: PBOX00108
  • Availability: In Stock
  • £100.00

  • Ex Tax: £83.33

Related Products

KIT00052 - BSA/Triumph 12V twin electronic ignition system

KIT00052 - BSA/Triumph 12V twin electronic ignition system

Here you have a Brand new Boyer Bransden, Micro-MK4 electronic ignition system. This kit is for..

£115.00 Ex Tax: £95.83

KIT00053 - Norton Commando / Atlas 12V twin

KIT00053 - Norton Commando / Atlas 12V twin

Here you have a Brand new Boyer Bransden, Micro-MK4 electronic ignition system. This kit is for..

£115.00 Ex Tax: £95.83

KIT00261 - BSA / Triumph Distributor unit single's 12V - With Coil

KIT00261 - BSA / Triumph Distributor unit single's 12V - With Coil

Here you have a Brand new Boyer Bransden, Micro-Power high power 12 Volt electronic ignition sy..

£200.00 Ex Tax: £166.67

Tags: PBOX00108, BSA, Triumph, TR7, T140, Bonneville, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, Norton, Commando, 1987, Boyer, Bransden, power, box, rectifier, no, battery, set, up, Zennor, Diode, zenor, electronic, ignition, system, UK, CPC, enginerring, cornwall, bike, parts, spares, for, sale,