Vespa Vitage series are ones of most popular survivor of motercycle evolution.They only have simple 2-stroke engines, steel frames and very poor electric equipments.
Original models (to be sold in Japan) have pairs of bar-end type winkers. But their 6V/18W incandescent bulb are too dark to catch other drivers' attention.
Bulb replacement with LEDs is now the most ideal way to improve this problem.But Most old type Vespas do not have voltage regulators. so the higher its engines rotational speed is , the higher the voltage of its electric system.If rev up to red line, the voltage would jump over 25V. Almost all LED equipments cannot sustain such broad voltage range.
Step 1: Materials
2) hexangular PCB for LED. 20JPY 8 pcs
3) LED drivers for upto 3 pcs 1W LED 140JPY 4 pcs
4) Nylon or brass standoff spacers and screw. Joint then so as to be as same length as original festone bulb.At least one of spacers MUST be Nylon or other insulating materials 100-200 JPY 2 sets
5) 6V voltage regulator for small moterbike i.e. HONDA MONKEY etc. 1400JPY
6) Turn signal relay for LED (2 pin or 3 pin) 300-600JPY
Totally, it costs 3020JPY - 3520JPY (about $30-$35)
Step 2: Build a Unit
Step 3: Connect a Pair of LEDs to a Driver Unit
Step 4: Connect Driver Units to Electrodes
Step 5: Set Up Turn Signal
Step 6: Install Voltage Regulator-rectifier and Turn Signsl Relay
Generally, voltage regulator-rectifier for motorcycle has four pins. Pin assign is shown on photo.
Output current of regulator- rectifier is still pulse wave. Without smoothing capacitor, LEDs will always blink rapidly.