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Author Topic: '78 550k Kill Switch not killing anything  (Read 607 times)

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Offline OneWheelDrive

  • A journey of 1000 miles starts with your first carb overhaul.
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'78 550k Kill Switch not killing anything
« on: December 14, 2010, 02:20:08 PM »
Working on the rebuild, and got the bike running.  Problem is, the key is the only way to stop the motor.  Any reason the kill switch wouldn't be functioning?  It's my understanding that the switch must be centered in order to complete the circuit and provide power to the coils.  Could the contacts be buggered, making them unable to disconnect?  How would I test the functionality with a multimeter?  Thanks!
« Last Edit: December 14, 2010, 03:34:53 PM by OneWheelDrive »
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1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline TwoTired

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Re: '78 550k Kill Switch not killing anything
« Reply #1 on: December 14, 2010, 02:23:44 PM »
It has a black wire input and a Blk/wht wire output.  There should only be continuity through it when the switch is in the RUN position.

You sure the switch hasn't been bypassed?
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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 OneWheelDrive

  • A journey of 1000 miles starts with your first carb overhaul.
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Re: '78 550k Kill Switch not killing anything
« Reply #2 on: December 14, 2010, 02:33:08 PM »
Wire harness appeared stock.  A bypass would just be a jumper between the black and the black/white somewhere?
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1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline TwoTired

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Re: '78 550k Kill Switch not killing anything
« Reply #3 on: December 14, 2010, 02:54:44 PM »
Quote from: OneWheelDrive on December 14, 2010, 02:33:08 PM
Wire harness appeared stock.  A bypass would just be a jumper between the black and the black/white somewhere?

Yeah. Could be in the headlight bucket.  I think that's where the bar control wires get connected to the rest of the bike with this model.

There is more than one black wire going to the bar control.   But, if you monitor the BLk/Wht for voltage.  The Black you disconnect and cause the power lost on the Blk/Wht, is the wire of interest in this case.

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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.
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