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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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.
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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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Hi , i have thunderbird twin spark enfield bike. problem that im facing since i bought this bike is battery seems there are charging problem with the fully charged battary last for...

Use volt meter on battery and see if regulator/rectifier is fully charging battery. Should read over 13 volts at about 2500 rpms. if not , bad re/rec. If it does, then it's probably bad battery, take to local shop to test. Should be a free test at places like Autozone, Pep Boys etc.

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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 ...:)

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6. Old battery dead cell loose or corroded cables.
7. Faulty wiring in the charging circuit.
8. Excessive wattage in a batteryless system.
9. Aftermarket parts are usually substandard.
10. Headlight not designed for a motorcycle system.
Some bikes have charging systems that get the job done but just barely and will have the most failures, you can upgrade the system with quality parts and a higher output. Relocating the voltage regulator to a spot more conducive to airflow will help immensely. Regular wiring system checks for corrosion chaffed wires, rerouting harnesses that run too close to heat sources ie. cylinders-exhaust etc. is great preventive maintenance to avoid those breakdowns in the middle of nowhere at 2 in the morning.
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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.

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Hi and welcome to FixYa,

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

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