Question about Ducati 748 S Motorcycles

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Hi Im having problems with my 748 sp battery not charging, have noticed the wires etc blackened and slightly melted, would the regulator be the problem? aNDY

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Sounds to me like your regulator is faulty

Posted on Sep 06, 2010

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I have a 1997 748 Ducati that keeps dying on me charged up battery runs good for short distance and then just dies put new rectifier battery but keeps doing it help


Hi, Sj88kc the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or damaged battery, 9 volts or lower.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. Gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
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Sep 11, 2011 | 2000 Ducati 748 E- S (Biposto-Monoposto) -...

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I have a Hyundai accent 2000 model the headlights are consistently dim.(it's like they're on park mode) the high beam works perfectly. I have replaced the lights however that hasn't fixed the...


Hi karinanina_k ,

You should find the fuse box under the hood , most probably beneath the sterring in the right hand corner.

I would recommend you to replace the blackened fuses and replace them with the appropriate fuses that are required as per their voltage.

There could be another problem which is bad earthing or grounding box, or the earthing box is not properly fit in it's place , you should check the earthing box in the bonnet and then check if there are any wires that have got carbon on it and then clean them with polish paper and connect them again.

hope this helps ...:)

May 09, 2011 | 2000 Hyundai Accent

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Sportsman 800 I have no charging and no RPM on the meter


Check all connections to see if they're loose and check the wires that go to the voltage regulator to see if it's not unplugged a bit, had problems with mine and the wire in front of the bike by the rad was slightly disconnected,wouldn't of notice if i didn't check every wire plug-in, fixed my problem, i also had the battery blinking on the the dash. hope your voltage regulator is not shot.check your battery with a meter (12.4-12.5) is good.

Apr 04, 2011 | Polaris ATV

1 Answer

I am trying to locate the alternator and voltage regulator in my 1985 jaguar xj6 there was an electrical problem and some on the wires melted down in the dash board we replacedd the wires and got a new...


FOLLOW ALTERNATOR WIRES AND BATTERY POSITIVE FEED WIRE.IT WILL TAKE YOU TO THE VOLTAGE REGULATOR BOX.CHECK ALTERNATOR FUSE.IF YOU HAD WIRES TO BURN AND MELT.MORE LIKELY YOU HAVE A BLOWED FUSE.

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Wandering what amperage the charging system opperates at because i replaced my old battery and 30 days later im having issues with starting batt tested 12.60 volts im not sure what amperage its suppose to...


The charge system is regulated by voltage. amps is not such an issue unless extra lights etc are fitted

Battery voltage
12v - 12.6v with the engine stopped. This should rise to around 13.5v with a couple of thousand revs. If it doesnt rise there is a problem. ( an innocent jump start from the car battery can spike the regulators on some bikes)

Sep 11, 2010 | 2003 Suzuki SV 1000 S

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I installed a new stator/generator and a voltage regulator/restifier on my 1993 kawasaki zx6E.. the wires from the stator to the connector which then runs back to the regulator are both getting warm and i...


Hi and welcome to FixYa,

The heating up would be normal as relatively, high current is passing through these wires/terminals not only to charge the battery but to power the electrics of the bike. If the regulator is working correctly, it would soon dwindle down since presumably the battery has been charged. Almost always, the connector used is not plastic but phenolic or epoxy based due to this very reason.  Another possible reason for excessive heat is that the terminals are not tighly fitted to its counterpart connector. A loose connector would result in a slight voltage drop but high current accross the connection.

Good luck and thank you for asking FixYa.

Jul 08, 2009 | 1993 kawasaki ZZR 600

1 Answer

Melting rectifier on ducati 900 ss


Hi and welcome to FixYa,

Offhand, it is a known/common failure of the regulator. This is especially so for those models with 2 phase alternators (2 yellow wires). The charging current is shared by only 4 diodes (rectifier). I have replaced in my 907 with 3 phase (3 yellow wires) effectively increasing the diodes to 6 thereby distributing the current and lessen the heat build-up. The charging also improved as noted by brighter headlights. In the 907, the yellow wires passes on the left side of the bike from the regulator to the engine. There are also connectors along the way that gets corroded.

Good luck and Thank you for using FixYa. Happy Holidays.

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