Description: 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 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.
Price: 98.25 GBP
Location: Leicestershire
End Time: 2023-12-11T16:17:21.000Z
Shipping Cost: 31.53 GBP
Product Images
Item Specifics
Return postage will be paid by: Buyer
Returns Accepted: Returns Accepted
After receiving the item, your buyer should cancel the purchase within: 30 days
Return policy details: If you are for any reason unhappy with an item from ourselves, please contact us and we will inform you of the best way to return the goods. Contact must be made within seven days. We reserve the right to send back any goods which have been returned to us without prior notice of a problem. For non-defective items, a 10% handling charge will be made and postage will not be refunded. All returns must be complete with a copy of the original invoice or a note of the invoice number and date.
Brand: Boyer
Manufacturer Part Number: PBOX00108
Classic Part: Yes
Country/Region of Manufacture: United Kingdom
