A Boyer Bransden Power Box 3 Phase Battery Eliminator with a wire attached to it, integrated with a Yamaha XS650 and a Permanent Magnet Alternator (PMA) charging system.
A Boyer Bransden Power Box 3 Phase Battery Eliminator with a wire attached to it, integrated with a Yamaha XS650 and a Permanent Magnet Alternator (PMA) charging system.
A small Boyer Bransden Power Box 3 Phase Battery Eliminator with a red wire and a digital ignition system.
A Boyer Bransden Power Box 3 Phase Battery Eliminator for a motorcycle with a Permanent Magnet Alternator (PMA) charging system and Digital ignition system.

Boyer Bransden Power Box 3 Phase Battery Eliminator

SKU: 108-0077

Regular price$149.95
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Boyer Bransden Power Box 3 Phase Battery Eliminator
Do you want to convert your Yamaha XS650 to a Permanent Magnet Alternator (PMA) charging system?
Do you want to upgrade to a modern digital ignition system with digital advance?
Do you want to convert to a kickstart only batteryless system?
If you answered yes to these 3 questions, then you need this Power Box. Please read below.

Boyer Bransden Power Box 3 Phase Battery Eliminator kits are the ultimate solution for replacing a battery in a Permanent Magnet Alternator (PMA) charging system. These are perfect for people who want to eliminate a battery from their 3-Phase PMA system, but also want to use modern digital advance ignition systems such as a Boyer Bransden Micro Power systems (TC Bros #108-0076). These power boxes replace the voltage regulator, rectifier, and capacitor that is usually found in batteryless PMA systems, but provide the "ultra-clean" power delivery required by sensitive digital ignition advance units. Although not required, these power boxes can also be used with stock points ignition systems or electronic ignitions using mechanical advance units (PMA charging swap required). Pair this power box with a Yamaha XS650 PMA Conversion kit (TC Bros #108-0004) for the ultimate in XS650 performance. Note: these power boxes will only work with 3-phase PMA charging systems and will NOT work with a stock XS650 charging system. Will not power an electric starter.
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XS650 models

  • 108-0077
  • JRC 3571

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