Boyer Bransden Power Box (Single Phase) – Triumph, BSA, Norton, Royal Enfield

Part Number : PBOX00108 Categories: , ,
(44 customer reviews)

£ 75.00 +VAT if applicable

Boyer Single Phase Power Box

In stock

4.95 out of 5
Part Number : PBOX00108 Categories: , ,

Boyer Powerbox for BSA, Triumph, Norton & Royal Enfield 12V Pre Circa 1978 Single Phase with alternator two, or three wire. This includes Single, Twins and Triples.

Consists of Rectifier, Capacitor, Zenor Diode so the originals will no longer be needed.

Advantages of a Boyer Powerbox

  • BATTERY FREE RUNNING OR BACK UP (BUILT IN CAPACITOR)
  • CAN BE USED WITH OR WITHOUT BATTERY
  • NEVER GOES FLAT IN WINTER
  • CAN SIMPLY CONVERT 6V MACHINES TO 12V
  • PROTECTS AGAINST OVERCHARGING WHEN USED WITH BATTERY
  • CAN POWER ELECTRONIC IGNITION, STANDARD IGNITION AND LIGHTS
  • CAN DELAY POWER TO LIGHTS UNTIL ENGINE IS RUNNING
  •  MAKES ROAD GOING CLASSICS MORE PRACTICAL
  • SAVES WEIGHT ON RACE BIKES

Converting from 6V to 12V

THE ADVANTAGES OF 12 VOLT CONVERSION

Most 6 volt permanent magnet alternator charging systems have no regulator to control the voltage output. Some use the
headlight switch to change over the charging coils when the lights are used. The load provided by the battery and bulbs
holds the voltage to approximately 7.5 volts, the value of a charged 6 volt battery. IF THE BATTERY BECOMES FAULTY OR
DISCONNECTED THE OUTPUT OF THE ALTERNATOR WILL RISE TO PEAK AT OVER 200 VOLTS, THE RECTIFIER AND/OR
ELECTRONIC IGNITION WILL BE DESTROYED. WE THEREFORE RECOMMEND THAT NO ELECTRONIC IGNITION BE FITTED
TO MACHINES WITH THIS TYPE OF 6 VOLT CHARGING SYSTEM.

Converting to 12 volts is going to provide more stable and reliable electrics, it will also improve lighting. Current through
the cables is halved and the output from the alternator will be up by at least 25% with no extra load to itself.
A typical alternator at 2000 rpm will charge approximately 8 amps into a 6 volt battery - 48 watts (volts x current). If the
battery is replaced with a 12 volt unit the current will drop to 6 amps giving 72 watts. In practice this is closer to 84 watts as
the battery voltage on charge is nearer 14 volts. At just under 15 volts the battery is fully charged. At this point, without a
regulator, the current is no longer stored by the battery and is lost as heat. The battery would eventually boil dry or explode.
This will not occur with a correctly fitted Boyer Bransden power box in place. In addition it is possible to start the machine
despite a discharged battery.

WHAT TO DO

The change to 12 volts is carried out by: fitting 12 volt bulbs, not forgetting instrument and warning lights, fitting 12 volt
battery with in line 15-25 amp fuse, fitting 12 volt ignition coils (6 volt coils can be used with some electronic systems or by
fitting a 1.5 ohm ballast resistor in series).

Remove the rectifier and disconnect the wires. The power box can be connected to these. The two yellow wires connect directly
to the alternator. Two of the original wires can be used and any connection to the headlight switch can be disconnected, some
machines have a resistor wire in the wiring harness, this can also be disconnected at one end and is no longer needed. The
third wire on the alternator is connected to one of the other two (see wiring diagram). The earth terminal on the rectifier is
normally the centre bolt, the wires on this can be bolted back to the chassis, along with the red wire if positive earth, or
black wire if negative earth from the power box. The opposite wire is then the main power feed to the ammeter or battery
and connects to the appropriate wire removed from the rectifier. The conversion is now complete.

For starting with a flat battery remove the fuse and kick, or bump start, rev up and while running fast replace the fuse.
The battery will then start to charge, if healthy.

Manufacturers Description

The 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. In each case a charging lamp control, or lighting delay circuit,
which prevents the lights being turned on until after the engine is started, is available.

44 reviews for Boyer Bransden Power Box (Single Phase) – Triumph, BSA, Norton, Royal Enfield

  1. Guest (verified owner)

    The Power Box was excellent. It did exactly what it was advertised to do. The instructions were easy to follow BUT there was a difference between the exit points of the actual wires and the photograph as shown in the instructions. I phoned the company and was advised as to the correct wiring set-up.
    As far as Burtonbikes are concerned, I am more than satisfied with the service provided but have issues with the delivery of the power box which I have discussed (via e-mail).

  2. Guest (verified owner)

    The Power Box was excellent. It did exactly what it was advertised to do. The instructions were easy to follow BUT there was a difference between the exit points of the actual wires and the photograph as shown in the instructions. I phoned the company and was advised as to the correct wiring set-up.
    As far as Burtonbikes are concerned, I am more than satisfied with the service provided but have issues with the delivery of the power box which I have discussed (via e-mail).

  3. Mike B. (verified owner)

    Bike is currently away being rebuilt so can only comment on service at the moment

  4. Mike B. (verified owner)

    Bike is currently away being rebuilt so can only comment on service at the moment

  5. Trond L. (verified owner)

    nice ithem

  6. Trond L. (verified owner)

    nice ithem

  7. Guest (verified owner)

    Excellent product. The second I've bought.

  8. Guest (verified owner)

    Excellent product. The second I've bought.

  9. Stuart H. (verified owner)

    Good product descriptions on website, very rapid delivery. Strongly recommended.
    Boyer power box and ignition system give good starting and running with no battery, ideal for reducing weight.

  10. Stuart H. (verified owner)

    Good product descriptions on website, very rapid delivery. Strongly recommended.
    Boyer power box and ignition system give good starting and running with no battery, ideal for reducing weight.

  11. Daniel W. (verified owner)

    Good packaging, fast delivery! Always a pleasure to order.

  12. Daniel W. (verified owner)

    Good packaging, fast delivery! Always a pleasure to order.

  13. Glynn H. (verified owner)

    Read the reviews, good instructions, easy to install, does just what it's meant too.

  14. Glynn H. (verified owner)

    Read the reviews, good instructions, easy to install, does just what it's meant too.

  15. Guest (verified owner)

    great service

  16. Guest (verified owner)

    great service

  17. Ian R. (verified owner)

    Exactly as described and fast delivery. Excellent all round.

  18. Ian R. (verified owner)

    Exactly as described and fast delivery. Excellent all round.

  19. john r. (verified owner)

    Seems good so far, fitted but not fired up yet.
    Hopefully will be on the road soon.

  20. john r. (verified owner)

    Seems good so far, fitted but not fired up yet.
    Hopefully will be on the road soon.

  21. Robert m. (verified owner)

    I have not fitted the powerbox yet as it is for a machine I am building,but, I have used a Boyer Powerbox on my Triumph Trident for the last 20 years and it has been completely trouble free and reliable. I rubber mounted the one on the Trident and maybe that has added to its longevity ?

  22. Robert m. (verified owner)

    I have not fitted the powerbox yet as it is for a machine I am building,but, I have used a Boyer Powerbox on my Triumph Trident for the last 20 years and it has been completely trouble free and reliable. I rubber mounted the one on the Trident and maybe that has added to its longevity ?

  23. keith s. (verified owner)

    nice item thanks alopt

  24. keith s. (verified owner)

    nice item thanks alopt

  25. Mikael A. (verified owner)

    Perfect and fast to buy online from BBB, parts is also high quality.
    Only gravlel in machiner is the parcelcompany DPD didnt conect to post/parcel-companies outside UK. The info on trackingparcel webbsite eas not so good so i had to search for my parcel…but that is not a fail from BBB.
    I give 5 stars to BBB and 2 stars for DPD

  26. Mikael A. (verified owner)

    Perfect and fast to buy online from BBB, parts is also high quality.
    Only gravlel in machiner is the parcelcompany DPD didnt conect to post/parcel-companies outside UK. The info on trackingparcel webbsite eas not so good so i had to search for my parcel…but that is not a fail from BBB.
    I give 5 stars to BBB and 2 stars for DPD

  27. Erik R. (verified owner)

    :+1::+1::+1:

  28. Erik R. (verified owner)

    :+1::+1::+1:

  29. Graham W. (verified owner)

    It is what I was looking for. Will be fitting it soon. thanks

  30. Graham W. (verified owner)

    It is what I was looking for. Will be fitting it soon. thanks

  31. Andy S. (verified owner)

    Quick delivery. This is a replacement for a unit I have had on my old T140v for 10 years. Unfortunately it had developed a significant fault. This new one is now fitted and running well.

  32. Andy S. (verified owner)

    Quick delivery. This is a replacement for a unit I have had on my old T140v for 10 years. Unfortunately it had developed a significant fault. This new one is now fitted and running well.

  33. Christer H. (verified owner)

    Fast delivery, good communication

  34. Christer H. (verified owner)

    Fast delivery, good communication

  35. judd h. (verified owner)

    Excellent service from british bike bits as always, fitted and works perfectly.

  36. judd h. (verified owner)

    Excellent service from british bike bits as always, fitted and works perfectly.

  37. keith d. (verified owner)

    Good quality and delivery

  38. keith d. (verified owner)

    Good quality and delivery

  39. stephen b. (verified owner)

    Item arrived very quick and was just what I needed to sort out a problem on my 5TA. Good company to deal with.

  40. stephen b. (verified owner)

    Item arrived very quick and was just what I needed to sort out a problem on my 5TA. Good company to deal with.

  41. Tony K. (verified owner)

  42. Pamela H. (verified owner)

  43. Tony K. (verified owner)

  44. Pamela H. (verified owner)

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