Connect a red wire from the engine post to one post on the horn. This is the power lead for the headlight, running taillight and the horn. There should be a male connection post on the side of the engine near the area where the blue and black or violet wire. The button will need to also ground to the handlebars or connect to the ground circuit. A switch for the lights is optional, but if wiring a horn, a button will be needed. If the brake light bulb burns out, the circuit will not complete and the ignition coil will not get any power from the violet wire causing the system to not provide the spark.įinally, we will finish up with wiring the headlight, taillight, and horn. It is also a safety feature for some U.S. Finally, connect a ground wire from the second post on the left brake lever switch to complete the circuit. Then connect a wire from the second post on the right brake lever switch to one of the post on the left brake lever switch. Then branch off from the blue wire another blue wire to one of the posts on the right brake lever switch. The last post is for the ground to complete the circuit. The brake light shines brighter than the running light. Connect the blue wire from the engine to the brake light post on the rear light. models, the Vespa engines came with a blue wire for a brake light. Some switches will ground to the handlebars they mount to, others may have a wire that can be connected a ground post on the engine or to bare metal on the frame. The other connection on the switch will need to be ground out. Connect a wire from one post or connection on the switch to the violet wire on the external ignition coil. To do that, you need a basic two position switch. This would be a good time to hook up a kill switch. The violet or black wire connects to the external ignition coil. From the engine, there should be violet or black wire.
Let’s start by wiring up the external ignition coil first. The Vespa moped engine should have two wires coming from the engine and one connector on the engine case. To begin we will be wiring up the external ignition coil for spark, front, and backlights. Check out our Mopeds for sale in Houston for Vespa moped models. If it has three coils, then its a system set up for blinkers and a battery. The Vespa ignition system should only have two internal coils. This is for a three wire points system without blinkers. This is a simplified version of a Vespa Ciao, Vespa Bravo, Vespa Grande, Vespa Si or other vintage Vespa mopeds.