Question about 1983 Benelli 900 Sei

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Charging light on an early 1980's 6 cylinder Benelli 900cc goes dim but does not go out completely. tried replacing all components but problem persists. Greatful for any answers, drawings, details or specifications. Kind Regards - Eric Pann.

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Hi Ericpann, in order to check out any main system electrical circuit, you have to start with a fully charged battery 12.5 volts or better, and be able to pass a load test if necessary.
1. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery.
3. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. If you are not getting these numbers, you might have a faulty voltage regulator.
4. Make sure voltage regulator is grounded and functioning properly, watch the video below on how to test a voltage regulator.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the meter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty rotor, follow step 6
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to a ground, the meter should read infinity. Connect both leads to the alternator meter should read 0.1 to 0.2 OHM'S. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
For more information about your issue please visit the websites below. Good luck and have a nice day.
How to diagnose and repair motorcycle charging problems
Motorcycle Battery Charging System Explained
https://dl.dropboxusercontent.com/u/35177464/Tornado/900%20Tornado/TORNADO%20User%20Guide.pdf
https://dl.dropboxusercontent.com/u/35177464/Tornado/900%20Tornado/Tornado%20workshop%20Manual.pdf
https://dl.dropboxusercontent.com/u/35177464/Benelli/TornadoWiringDiag.pdf

Posted on Dec 12, 2015

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Even if your battery is barely strong enough to start the car (that's all a battery is really needed for anyway - once started, your TranSport will run without a battery), the alternator should provide enough Volts/Amps to light the headlights fully and steadily. The symptom you're having tells me that your vehicle has either a problem with the alternator or the voltage regulator which is an integral component of the alternator.

Secondary items to check: loose wiring harness to one or more headlights.

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In the US., one can drive to an Advance Auto Parts/AutoZone/Pep Boys and get a free "charging system check", which is done without removing any components of the car. You simply turn on the car and the technician checks the car while it idles in the parking lot. This check will tell you if you have a weak alternator.
Also, a battery can be disassembled out of the car and load tested in an in-store battery tester by the same auto parts stores.

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So,Take the battery and have it load tested (free at most auto part stores)
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Please rate this fixya

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