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Loss of electrical power 01 Sep 2021 12:08 #854691

  • Buck17
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Good Day,

I have a 1978 KZ400B1 I rebuilt recently and had out for one ride. The second ride I turned the ignition switch, pushed the start button and lost all electrical power. I checked the battery connections are clean and when checking conductivity found that if I unplug the right handlebar switch, which houses the on/off kill switch and starter button the neutral and oil pressure light will illuminate. I have purchased a new right side switch and if I plug in it will cut the connection and the lights will go out. I also installed a new ignition coil and have checked conductivity of the ignition switch, also good. Fuses have also all been checked with volt meter. 

I have opened the wiring harness and found no bad or open connections. I am just about out of ideas and looking for potential solutions if anyone can suggest. Thank you! 

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Loss of electrical power 01 Sep 2021 12:43 #854692

  • loudhvx
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Check fuses, wires soldered onto the ignition switch, and broken wires near where the harness goes from the frame to the steering assembly.

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Loss of electrical power 13 Sep 2021 12:26 #855222

  • Wookie58
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Do you have a wiring diagram you can send me, these things normally have a logical explanation

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Loss of electrical power 14 Sep 2021 06:17 #855244

  • slmjim+Z1BEBE
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Load test the battery.

Good Ridin'
slmjim & Z1BEBE
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A Rider looks at your odometer and tags.

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Loss of electrical power 14 Sep 2021 12:16 #855260

  • Wookie58
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Hi Buck 17

I have put together a test plan (attached) that may help. It's looks heavy but should only take about 20 minutes. Info for colours etc taken from a diagram for a 77 ( there isn't a manual for a 78 on here)

happy hunting

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