A modern electrical system without a battery on your scooter in no way destroys the look, it is an invisible and economical gain in safety and comfort, because:
Without a battery, there is also no need to purchase/replace and maintain the battery
Your electrics and all consumers function independently of the battery status or charge level
You efficiently prevent corrosion damage to your Vespa PX due to an overcooked battery/battery acid
Significantly more safety thanks to increased light output = increased visibility = being seen better & and seeing better
Conversion wiring harness for all Vespa PX models built up to 1982
This wiring harness is perfect for converting your Vespa PX, which has a battery from the Piaggio factory, to a modern and maintenance-free on-board electrical system without a battery. We offer an inexpensive and practical set with all the necessary new switches and ignition lock (BGM6685KT).
The PX wiring harness in the Italian version for models without battery is also available for replacement / restoration. In this version, the indicators, the horn (so-called buzzer) and all other consumers are supplied with power directly via the on-board AC system. The ignition base plate used on these vehicles with only 3 cables (contact ignition models) or 5 cables (vehicles with electronic ignition) is suitable for this.
To convert your scooter to modern electrics, you will need the following parts and save yourself the battery, winterizing and care/maintenance of the vehicle battery in future
VOLTAGE REGULATOR: Basically, the simple 3-pole voltage regulator (G|G|M) is used for this wiring harness (e.g. 9100001). The 5-pin voltage regulator (A|A|B+|G|M) originally used on vehicles supplied ex works with a battery can still be used. Only the connections B+ and G remain unassigned (formerly charging current for the battery). A better alternative is the compact and powerful BGM Pro voltage regulator (BGM6690). This can, for example, also supply a USB socket with 12V DC voltage for charging a cell phone/navi etc.
IGNITION / IGNITION BASE PLATE /LIMA: The type with 5 cables is used as the ignition base plate (also recognizable by the blue and black cable for the single power supply). The original 7-wire Lima of the models with battery can no longer be used. However, due to their age, the cable insulation is often damaged anyway. A conversion to the more powerful ignition base plate of the later Lusso models (e.g: BGM8025N or BGM8032N) is therefore highly recommended. This considerably increases the total light output of the AC system, as no more current is diverted for battery charging. This means that even old PX models can be fitted with a 35/35W lamp. Most 5-wire alternators have a round plug. The wiring harness offered here has 6.3 mm flat plugs (as in the Italian original). Either the wiring harness can be converted to a round plug or the ignition base plate can be converted to a flat plug. The necessary parts can be found in the accessories.
FLASHING RELAY: The models with battery use a DC (direct current) flashing relay. After conversion, an AC (alternating current) flasher relay is required (e.g. 1195703).
Checklist: Spare parts / parts to be connected to the wiring harness
To make sure everything works, you should go through this list and check whether your old parts are still OK. If not, you can order them directly from our Vespa store via the link:
CONCLUSION: Absolutely sensible conversion to modern, more powerful and maintenance-free electrics
Tutorial installation wiring harness video instructions
This is a PX-Lusso wiring harness, it has different connections, so don't get confused. However, the basic principle is the same and this video tutorial may help you to lay and connect the wiring harness in the bodywork of your Vespa.
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