Re: 82' Honda CB750 Charging Woes
- From: "Uncle Banas" <the.pooze@xxxxxxxxx>
- Date: 24 Jun 2006 22:34:54 -0700
Gotcha, have to replace the rotor I guess.
RogueJesse@xxxxxxxxx wrote:
Looks like your rotor is bad. The rotor should have 4-6 ohms
resistance.
Jesse
the.pooze@xxxxxxxxx wrote:
Here's the story: picked up an 82' CB750, runs and drives fine... but
the battery doesn't charge. First thing I did was buy a clymer manual
and go through their troubleshooting procedure. Everything checked out
ok, including the voltage RR, but since that was the most complex
component of the system and the readings were a bit "high" resistance
wise I decided to replace it anyways to the tune of $100 (ouch).
Still doesn't charge. What I've done so far;
1. New battery, fully charged (to note I've also hooked up a fully
charged car battery to see if that would provide proper excitation
voltage). On a motorcycle battery, eventually it'll run down to between
10.5 and 11.5 volts and just degrade worse if the headlight is
connected.
2. I cleaned up the connectors and then after that didn't work went
ahead and cut them off and put new ones on with clean connections to
remove any corroded wire ends.
3. Brushes on the stator cover look 'new', plenty of room left until
the scribe lines.
4. Rotor slip rings measure very low resistance between both hot AND
cold (~0.1 ohm). Visual inspection of the rotor was satisfactory, it
does not look discolored and has not sheared the key off the shaft. I
also cleaned the rotor surface. To note I also measured these readings
through the connectors as well and they are satisfactory.
5. Stator windings all measure very low resistance between them (on the
order of an ohm or less) and do not fault to ground. Upon visual
inspection, the stator enamel looked very good and the wires were not
discolored. Also measured windings resistance through connectors and
again, satisfactory.
6. Inspected battery cables, put new ends on to remove corroded wire
tips, but generally look "ok".
7. Frame ground looks "ok".
8. Replaced 30amp tin fuse on starter relay with piece of wire to
remove it from the equation. TO NOTE*: The fuse was getting extremely
hot (burnt my hand), actually the relay would smoke it would get so
hot, after replacing it with the wire it is now cool.
9. Disassembled the relay to the extent I could (couldn't get the
bottom anodized portion off) and cleaned the contacts. I still do not
trust this and suspect it may have internal corrosion, although visual
inspection indicated the interior is in "pristine" condition. Not quite
sure what the two tiny copper wires are that connect inside the
anodized portion, I would assume this is the starter solenoid itself.
Either way the bike starts fine.
10. Checked pigtails and connectors to the stator housing and the rest
of the bike. Everything looks fine with no grounded or exposed wires.
All insulation seems to check out ok along with resistance readings.
11. Measured AC output voltage from the 3 stator windings while the
bike is running--registers a low (10-12V) voltage.
12. Excitation wires measure battery voltage (low usually, 10.5-11.5)
volts, and 1.5 volts respectively.
And that's it, I'm actually an electrical engineer and I'm still
stumped by this problem. It's already almost July and I'd like to start
riding my bike!!!
Any help is GREATLY appreciated!
.
- References:
- 82' Honda CB750 Charging Woes
- From: the . pooze
- Re: 82' Honda CB750 Charging Woes
- From: RogueJesse
- 82' Honda CB750 Charging Woes
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