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You can find various led light bulbs in our webshop. Fitting an led bulb requires several adjustments to a Puch's electrical system. Here you can find some information and how you can do it:

Alternate current (AC)

A original Puch Bosch / Ducati / Iskra ignition with breaker points delivers 6 volts and alternating voltage (AC). Alternating voltage means the voltage changes from off-peak to peak voltage, see illustration:
AC voltage is not suitable for an led light bulb because the led bulb only works properly on direct voltage. The led light bulb will light up on AC voltage, but it cannot handle the peak voltage and will therefore break down. So it is important to convert the AC voltage to DC voltage. We do this with a rectifier.

Rectifier

So the rectifier makes direct voltage from alternating voltage, which is important for the led light bulbs to work. It is also important for charging a battery, for instance, which must be done with direct voltage at all times. But also to make a horn work with direct voltage. The rectifier is placed after the voltage regulator.

The rectifier (201961) has 4 connections.

  1. Power supply to Lamp/horn/battery (DC voltage)
  2. Power supply from the voltage regulator (AC voltage)
  3. Ground ( this is fitted to the ground of the lights/battery or horn)
  4. Ground wire (to the frame)

Voltage regulator 3-pins 12-volt 

The voltage regulator ensures that the input value remains at a constant level. This means that the voltage supplied to the voltage regulator remains constant. When using a led light bulb, the voltage regulator is placed in front of the rectifier. When using regular light bulbs, the voltage regulator can be used to prevent the lamps from burning out at peak voltage. 

The voltage regulator 3-pins 12 volts (80135).

  • An input power supply (from the ignition)
  • An output power supply (to the rectifier)
  • A ground (this is attached to the frame)

Voltage regulator 12-volt 5-pins

The voltage regulator 12-volt 5-pins (150253) has 5 connections. This voltage regulator can be used for a horn and/or to charge a battery, this is the only difference from the 3-pins variant: 

  • An input power supply (from the ignition)
  • An output power supply (to the rectifier)
  • A ground (this is attached to the frame)
  • An outgoing wire to the horn
  • An outgoing wire to the battery
If the connection of the horn and battery are used, it is important to use a rectifier. This is because a battery must be charged with direct voltage (DC) at all times, the horn is available in both direct and alternating current. 

Conversion from regular to LED light bulbs

To convert from a 6/12 volt regular lamp system to a 6/12 volt Led system, the following is required:

  • A voltage regulator in 6 volt or 12 volt
  • Rectifier (201961)
  • Ground wire from voltage regulator to frame
  • Ground wire from the rectifier to the frame

Below is a short description of how the circuit of the 3-pins voltage regulator should be connected: 

  • The supply wire from the ignition is connected to the input pin of the voltage regulator
  • The ground wire from the ignition is connected to the voltage regulator housing. 
  • The output wire from the voltage regulator goes to the input pin of the rectifier (Pin number 2)
  • From the ground pin of the voltage regulator, a wire goes to a ground point on the frame 
  • From the rectifier a wire goes to the component to be controlled, this could be a horn, lamp or charging a battery. Or more than 1 of course
  • From Pin 3 a minus wire goes to the component to be controlled, this could be a horn, lamp or charging a battery. Or more than 1 of course
  • From Pin 4, a ground wire goes to the ground point or frame. 
  • In addition, the bulbs obviously need to be changed from incandescent to Led bulbs. When converting, note whether it is a 6- or 12-volt system and therefore whether 6- or 12-volt bulbs are needed.

Conversion from regular bulbs to LED bulbs 6 volts + 12 volts Kokusan ignition

A Kokusan ignition has a voltage regulator with an integrated rectifier. This means that a moped with a Kokusan ignition can be fitted with LED lights without any modifications. 


Conversion from regular bulbs to LED bulbs 12 volt HPI 2 ten ignition

The HPI 2-ten ignition does not include a voltage regulator or rectifier as standard. A separate voltage regulator is available in the shop (80076). This voltage regulator contains an integrated rectificeer. 

So if the HPI 2-ten is mounted with the voltage regulator as in example photo 1, LED lamps can be mounted. Below are 2 wiring diagrams where the voltage regulator is fitted:

  • Example 1: This set up provides equal voltage. In this set up, the voltage regulator with integrated rectifier is fully connected. This means that LED lamps can be used using this set-up. A battery can also be charged with direct current. In addition, a signal actuator can be connected and indicators can be fitted.
  • Example 2: In this setup, the voltage regulator with integrated rectifier is not fully connected. As a result, the rectifier has no function, so AC voltage continues to flow in the circuit. With this setup, it is possible to drive bulbs, but not LED bulbs.
  • Note: you have to use 12-volt light bulbs with the HPI 2-ten ignition at all times.

Conversion from regular bulbs to LED bulbs 12-volt MVT ignition

This explanation applies to both the MVT digital race ignition (14222) and the MVT premium (150247)

  • MVT ignitions are supplied without a voltage regulator as standard. These are available separately in the shop and must be fitted for stable light output (150253). This voltage regulator does not contain a rectifier. An additional rectifier must therefore be added to use LED lights. 
  • Note: you have to use 12-volt light bulbs with the MVT ignition at all times.
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