Question about Honda CB 750 Nighthawk Motorcycles

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1984 Nighthawk 750 - won't charge on long runs...

I have a 1984 Nighthawk 750S, with 33,000 km. After a longer run (hour or so) the battery will not charge. Charges fine on a trickle charger at home. Mechanic has tested both stator and regulator - problem persisits all the same. Works fine on a short run - but they are not much fun are they?!

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When older electrical components are used for extended periods of time they heat up and become inafective and fail to perform, you should replace the voltage regulator.

Posted on Jul 16, 2009

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Posted on Jan 02, 2017

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What is the wattage output on the 2001 750 nighthawk?


Ohms law comes into play here ... Volts x amps = watts ...
I don't think you are asking the right question ... lets try to work through this. Your motorcycle actually runs off the battery. Your alternator charges the battery as is required. It will not over charge because the regulator tells it to shut off when the battery is full. It does not go dead because when the battery is down, the regulator turns the alternator on and charges it back up. The alternator is constantly being turned on and off to maintain a full charge. When you fall below some charging criteria, your battery light comes on meaning you are using more power than you are producing. Normally, when the engine speeds up, so does the alternator and over comes this problem. Your battery is rated in Amp Hours ... lets say your battery is rated at 10 amp hours ... that means the battery will put out one amp for 10 hours before it is considered to be dead. Conversely, it will put out 10 amps for one hour before it is dead. Enter the alternator. I don't know what a farkle is or the amount of power it uses. I would certainly put a switch on it so I could disconnect it from the circuit.

Calculate your present use by adding the wattage of all the lights - compare that to the size of your battery - that should give you some idea of the slack you are anticipating.

12 volts X 10 amps = 120 watts.

Here is a very interesting article on Batteries for your consideration.

http://www.chem.hawaii.edu/uham/bat.html

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1993 Honda CB 750 Nighthawk will not turn over


Hi, Anonymous before testing any electrical component in the Starting System it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage, the battery is faulty and must be replaced. AGM type batteries fall into this scenario more so than lead acid batteries.
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Check the battery terminals for damage or corrosion check the 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.
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5. FOB battery low or dead.
6. Faulty ignition switch.
7. Faulty starter button.
8. Faulty kickstand, clutch, neutral safety switch.
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10. Starter relay, solenoid, starter have failed or circuit wiring faulty.
11. Starter armature or field coils have failed.
12. Main fuse or circuit breaker may be blown or faulty.
13. Faulty ignition relay.
14. The electric starter is working but starter clutch has failed.
15. Check for engine trouble codes.
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soory about your trouble but it sounds like the yoke inside the starter itself is not engaging. If you know how or know someone that could take the starter apart and try to grease the yoke shaft so it can slide freely back and forth it should do the trick.

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sounds like your battery is either low or knackered try a long 6-8 hour charge should do it if not battery could be knackered

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Possibilities are>
  • Wires not hooked up properly or a wire is disconnected
  • Bad rectifier or bad voltage regulator
  • Dirty or loose wire connections
  • Bad stator
Can I get a “very helpful” rating on this answer?

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