Wiring diagram Aermacchi SS and SX 350

Nederlandse versie

The 12 volt electrical system of the Aermacchi SS and SX 350 with starter motor, drawn circuit by circuit. Each wire is labelled with its colour.

Always check a wire with a multimeter before you connect it, and disconnect the battery first.

Circuit 1Power from the batteryThe positive goes through the fuse to the ignition switch. The negative runs to the starter motor and earth.
redpositiveredterminal 1 and 5Ignition switchFuse 25 AblacknegnegearthMStarter motorBattery 12 V
Circuit 2ChargingThe alternator supplies AC. The regulator turns it into DC and charges the battery.
brownterminal 2terminal 1Regulatorbrownterminal 2terminal 8Ignition switchbrownterminal 1terminal 3Regulatorgreenterminal 3terminal 9Ignition switchGGeneratorredterminal 4redpositiveBattery 12 VFuse 25 Aredterminal 4terminal 7Ignition switchvioletterminal 2blackterminal 6Ignition switchWarning lampgenerator, greenblueearthEarthframe or engineRegulator
Circuit 3StartingThe start button energises the relay. The relay sends the heavy current to the starter motor.
blackterminal 62-colourterminal 85Starter relayterminal 86 earthedStart buttonIgnition switchterminal 6redpositiveterminal 88redterminal 88apositiveearthMStarter motorStarter relayBattery 12 V
Circuit 4IgnitionThe coil gets power through the ignition switch. The points switch the coil, and the coil gives the spark to the plug.
blackterminal 6INblackRTearthContact breaker pointsblackHT leadearthSpark plugblueearthEarthframe or engineIgnition coilIgnition switch
Circuit 5Headlamp and parking lightThe changeover switch sends the current to the headlamp or to the parking light.
2-colourterminal 4C2-colourKINblack1aearthHeadlamphigh or low beamwhite2bearthHeadlamphigh or low beamHandlebar switchyellowSearthParking lightlamp in the headlampyellowSearthWarning lampparking light, redChangeover switchIgnition switch
Circuit 6Tail light and clocksThe same yellow wire feeds the tail light and the instrument lighting.
yellowterminal 3 and 10GearthTail lightyellowterminal 3 and 10blackearthRev counter lampSS onlyblueearthEarthframe or engineSpeedometer lampIgnition switch
Circuit 7Stop lightBoth brake switches get power after the ignition switch. Either one is enough to light the stop light.
2-colourterminal 2greenSearthStop lightBrake switchfront2-colourterminal 2greenSearthStop lightBrake switchrearIgnition switch
Circuit 8HornThe horn has positive after the ignition switch. The button on the handlebar makes the earth.
2-colourterminal 2greyCLearthHorn buttonon the handlebarHornIgnition switch
Circuit 9Turn signalsThe relay passes the current in pulses. The switch selects side A or B.
2-colourterminal 22-colourKI2-colourKAWarning lampturn signal, amber2-colourKAFront turn signalside A2-colourKARear turn signalside Alight blueKBWarning lampturn signal, amberlight blueKBFront turn signalside Blight blueKBRear turn signalside BHandlebar switchFlasher relayIgnition switch
Read this firstWatch out forUncertain colours and terminals
  • 2-colour means a two-colour wire whose colours are not certain. Other wire colours may also differ, especially red, black and white.
  • Terminal numbers are on the parts themselves. Check with a meter which ignition switch terminals are connected in each key position.
  • KA and KB are the two turn signal sides on the handlebar switch. Check which one is left or right.
  • The turn signals are earthed through the frame.
  • There are connectors in the wires to the rear.
  • The rev counter lamp is fitted to the SS only.

Our own drawings per circuit. The connections are based on the workshop manual for this model. Not an official publication of the manufacturer.

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