Author Topic: Regulator Rectifier Test - It looks like a bad RR??  (Read 7015 times)

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Offline TicoCafe

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Re: Regulator Rectifier Test - It looks like a bad RR??
« Reply #25 on: August 12, 2011, 07:41:27 PM »
Quote
You will be checking the system (or regulator) while it is working configuration.  Yes, everything will be plugged in.  You may need extra jumpers to access some points of the system with probes.  Either that, or component substitution with known good, or continued guessing...

The plug that contains the yellows (Alternator output), also has the rotor or magnetic field coil wires.  The voltage on the field coil wires determines the output strength of the alternator.    Higher voltage on the B & W make the yellows put out more power.

If your battery is still not being charged, your regulator may not be passing voltage to the alternator.

It is a process of elimination.  You have checked the rectifier and found it good.  You have corrected the field coil connection to the regulator.
Now you need to know if the regulator is still performing.

Or you could check the yellow wire connections to the rectifier.  If you find the same high resistance indications that you had on the black and white wires, that can be cause for failure, too.

The regulator and wiring are the last major components of the charging system that you haven't "proven" with test devices.

Alternator rotor -- √
Alternator Stator -- √
Rectifier -- √
Connection from slip rings to regulator -- √
Regulator -- ?
Connection from stator to regulator -- ?
Connection from key switch to Regulator -- ?
Connection from Rectifier to Battery -- ?

Once you have checked all the system components and assembled them into a system, it must work as it did originally. 
Physics demands it.
No hand waving required.  ;D

Cheers,

Found the SHORT... It was the wire connector at the base of the Brush Holder.  It was accidentally pinched when it was put back together.  ;D
 
Below here is the Regulator Test as requested...

This Tests is at the Battery Terminals:
12.75v Bike OFF
12.50v @ Idle
14.36v @ 2K RPM
14.40v @ 3K RPM
14.40v @ 4K RPM
14.40v @ 5k RPM

This Test is from the Black and White Terminals at the RR:
12.2v @ Idle
11.3v @ 2K RPM
7.5v @ 3K RPM
6.4v @ 4K RPM
5.6v @ 5K RPM

How does the results look Two Tired???  I assuming it looks OK!!!


I did also find out the Bike is also running on 3 Cylinders only...The outermost left cylinder if you are sitting down.   :-\ That another project!

I cant thank you guys enough on helping me troubleshoot my issue. 

Pura Vida!

Offline TwoTired

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Re: Regulator Rectifier Test - It looks like a bad RR??
« Reply #26 on: August 13, 2011, 01:22:03 AM »
Looks like your charging system is working fine.  And your regulator is doing just what it needs to keep the battery from overcooking.

Feels good to fix it yourself, doesn't it?

Good luck on your next project!

Keep it up and you'll be in serious threat of having a bike that just needs riding and no work.

Cheers,
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline gunner

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Re: Regulator Rectifier Test - It looks like a bad RR??
« Reply #27 on: July 22, 2012, 06:58:40 PM »
Hi everyone,

I know this post has been closed for quite some time, but I'm experiencing a very similar problem and am looking for some advice.  I performed all of the tests described here and my charging circuit is still not working.  I've started a new post (http://forums.sohc4.net/index.php?topic=110322.0) and would greatly appreciate some help!

Thanks for all the valuable information in this thread.

Dylan
'79 CB750 LTD