new to me 1978 KZ 1000

TexasKZ wrote:

FSM = Factory Service Manual ( not Haynes, Clymer, et cetera)

Oh yes!

Thanks TexasKZ

 

Treetall wrote:

Thanks Wookie
I will check the voltage shortly. The battery is a week old.
The R/R is a used one. There must be a way to test it! I know Ed has said he has purchased several?! If the stator checks out in spec and the voltage readings from the battery and ground are good, the battery is good then that is your R/R test 
Can you refresh my memory what is FSM ? Factory service manual
I forgot to ask in the first post. What size wires should I be running from the R/R to the battery? I think I'm running a 14 or 16 gauge. Too small!? 16 is definitely too small, 14 is marginal, I would use 12awg (see below for voltage drops for each size of cable)

 

Wookie58 wrote:

Treetall wrote:

I have an electrical question.
I installed a SH 775 R/R. It's the proper one, with the stamp on the fin.
First I had the positive going into the OEM plug with the fuse. But I wasn't getting enough volts. So I hooked it up directly to the Battery. Positive and negative.
All the connections are solders. I hooked the stator wires ( Yellow, Blue, Red) to the R/R. Eliminating the old plugs, wires, and regulator, rectifier.
Testing all 3 combo's  RY, RB, YB. I get 60 VAC @ 4000 rpm.  But I can only get 12.62 VDC , at the battery at 4000 rpm.
Is this pointing toward a weak stator? From all the reading I've read on here. It's kinda pointing that way!?

What is the battery voltage when the motor is "off" ?   I charged the battery yesterday. Today it is/was at 13.1 volts before doing tests.
Is the R/R you have "new" or "used" ? The r/r is used
With stator disconnected have you checked the resistance as per the FSM ? (RY,RB,YB should be between 0.56 - 0.84 ohms) With the ohms set on 200.  All three read 1.5 ohms each.
Set at 2k they read .002 ohms
also check between each of the three leads and ground.  I checked these and got no reading. So this should tell me there is no short!  Correct?!
with everything connected put a voltmeter red lead to battery "positive" and black lead to "positive" coming out of the R/R (should be no more than 0.5v)
Connect voltmeter black lead to battery "neg" and red lead to ground wire coming out of R/R (should be no more than 0.3v)  I'm not sure if I was doing this right.  But I got the same voltage at the battery and at the connection coming out of the R/R, on all the different combos.
I couldn't see a stator spec in the manual but I believe anything above 50v AC on each leg is OK I checked it again and was getting 67 VAC  on all 3 wire combos.
I checked the voltage at the battery after letting it idle for a few minutes to warm it up.  1500 RPM- 12.73V  2000 rpm - 12.80V 4000 rpm-12.92V
I also switched up to a 12 AWG pos. and neg. wire off the R/R to Batt.

 

Injected wrote:

I have installed two of those SH775 RR's on my bikes, I run #10AWG wire direct to the battery. On the positive side I run a 30A inline fuse between RR and battery.

Thanks Injected
I went with a 12 Gauge wire. On the Pos. and Neg.   Automotive store didn't have any #10.  Good point on the inline fuse, I plan to do the same.