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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 29 Jun 2020 16:15 #829386

  • Colecarv
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Battery connected
Key off:
Holds charge at ~13v

Key on: 12.7v ~very slow drop

Run switch turned to: RUN
Drops to 12.38v

Key turned off again: back up to 12.68v then slowly climbs in voltage again to 13v

No Draw on the battery from a Short.(another Variable Eliminated)

The Battery did charge before i relocated the regulator and rectifier.
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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 29 Jun 2020 16:38 #829387

  • F64
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hold on...checking something

The service manual for your model has a different method of verifying output voltage from the stator.
I usually disconnect the stator and measure the AC voltage across the three phases at around 4000 rpm.
Later service manuals do the same.
I have to read more on it before I send you down that path.
81-KZ440-D2. Louis Dudzik's GM HEI ignition module converted 2015--no issues, Motogadget m-unit blue.
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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 29 Jun 2020 18:51 #829396

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Ok, let's try this.

Check your stator output.
the connector in the red box disconnected
probes on wires coming from alternator

Meter to AC voltage.
There are 3 wires.
check all 3 combinations.
pink, blue
pink, yellow
blue, yellow
Engine on
bring the engine to 4000rpm
note voltage at 4000 rpm








shut off bike
meter to OHMS
measure the same wire combinations checking the resistance
note resistance.

meter to OHMS
one probe on a stator cover bolt (make sure it's clean electrically..no rust, paint or corrosion)
The other probe on each of the stator wires. pink, blue yellow.
Make sure the reading is open (O.L.)
81-KZ440-D2. Louis Dudzik's GM HEI ignition module converted 2015--no issues, Motogadget m-unit blue.
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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 29 Jun 2020 22:56 #829412

  • Colecarv
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Wow, Really appreciate the direction.
I guess I know what i’m up to some point tomorrow, and i’ll respond asap.

thankyou

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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 05:23 #829418

  • hardrockminer
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This video will help you understand your electrical system, although the regulator on a Z1 is different than on your bike. But the stator test should be the same.

www.youtube.com/results?search_query=kawasaki+z1+electrical
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.
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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 10:52 #829438

  • Colecarv
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I believe i had my meter on the right settings.

Pink/yellow:
18 at idle
77 at 4000 rpm
Ohm: 0.9 with probe

Pink/ blue:
19 at idle
80 at 4,000 rpm
Ohm: 0.9 with probe

Blue/ yellow:
19 at idle
72 at 4000 rpm
Ohm: 0.9 with probe

I could not get a reading from the stator cover bolt combinations: I may not have had the meter in the righr setting, Not sure what The O/L Setting would be.

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Last edit: by Colecarv.

77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 11:04 #829439

  • F64
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O/L is open circuit
sorry about that..I just realized it's specific to Fluke meters

Stator looks good
81-KZ440-D2. Louis Dudzik's GM HEI ignition module converted 2015--no issues, Motogadget m-unit blue.
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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 11:21 #829445

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Is 0.9 ohms too high on resistance?
I know t he significant jump from 18 to mid 70s is a great sign.
So are these clue pointing towards the rectifier having gone bad/bad connections to it?
If i understand the basic circuit explanation from the video our other friend posted for me, the rectifier delivers the charge current back into the battery. I have some extra 77A1 rectifiers I might be able to swap it with.

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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 11:30 #829446

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.9 is fine it's at the top end of the specification.
Your wires or probes may be contributing to the extra resistance.

81-KZ440-D2. Louis Dudzik's GM HEI ignition module converted 2015--no issues, Motogadget m-unit blue.
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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 11:41 #829448

  • Colecarv
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I see, When I made the first resistance tests I was using an alligator clip wire which had a reading of 1.3-1.5 ohms.
I removed the clipped extension wire and got the reading of 0.9/0.8 ohms.

So now that t resistance is established as okay, this leads me back to my rectifier query

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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 11:47 #829449

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The next check will be the rectifier.
I want to find out what is exactly wrong as best I can.
I try not to swap out parts if I can help it.
For all I know, you could have one bad wire or a bad connection.

There will be 12 readings.
Meter on OHMS.
Disconnect the rectifier at plug marked by the red box.
Also disconnect the white wire.

You will need to put the RED probe on the BLACK wire.
The BLACK probe on each of the YELLOW wires
Note the 3 readings
Reverse your probes and do the reading again.
Note the 3 readings

Move your RED probe to the WHITE wire
BLACK probe to each of the YELLOW wires
Note the 3 readings

REVERSE the probes
Do the readings again.
Note the 3 readings

Total of 12 readings.

What is happening is you are checking the three diodes.

The first 3 readings will either be really low or really high.
When you switch the probes for the second set the readings will be the opposite of the first 3.
If the first three readings were low, then the second three would be high.

Then with the white wire same story. The second set of three will be the opposite of the first.
If any of the readings don't follow this scenario, the rectifier may be bad.

Simply put, diodes are a one-way valve. They flow in one direction not in another.


81-KZ440-D2. Louis Dudzik's GM HEI ignition module converted 2015--no issues, Motogadget m-unit blue.
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77 kz 1000A1 Loses spark and dies along with lights and button start after 20min 30 Jun 2020 18:30 #829471

  • Colecarv
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Great thanks alot, i’ll be running the 12 readings in the next couple hours.

And just to be sure the bike is to be shut off, Should I disconnect the battery ? also should I run the same ohm tests i did before on the stator but with the battery disconnected ?

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