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Testing Norton Commando MKIII headlight switches #662765
08/03/16 2:33 pm
08/03/16 2:33 pm
Joined: Nov 2015
Posts: 29
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Dnaj11 Offline OP
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Dnaj11  Offline OP
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Penna
I've got a 75 Norton MKIII which had a leaking master cylinder. I've rebuilt the master cylinder but had to take apart and clean the switches on that side which had become contaminated with brake fluid and crud. I took care not to loose the flat tabs and springs inside the plastic switches and believe I did put it together correctly. Unfortunately, I did not test to see if they worked before I started this and the bike has not been run in years. Is there a way to test the switch for the headlight. I'm not sure which wire should have voltage in the various switch positions. I'd like to rule out all other possibilities before taking the small switches apart again. They are not fun to get together with old fingers like mine. Thank you.

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Re: Testing Norton Commando MKIII headlight switches [Re: Dnaj11] #662767
08/03/16 2:52 pm
08/03/16 2:52 pm
Joined: Mar 2006
Posts: 3,695
Norfolk, UK
L.A.B. Offline
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L.A.B.  Offline
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Joined: Mar 2006
Posts: 3,695
Norfolk, UK
Originally Posted By Dnaj11
Unfortunately, I did not test to see if they worked before I started this and the bike has not been run in years. Is there a way to test the switch for the headlight. I'm not sure which wire should have voltage in the various switch positions.


There are only two positions for the Mk3 headlamp selector switch, HEAD and PILOT.

With the sliding switch set at the HEAD position, there should be continuity between the blue [U] and the blue/yellow [UY] wires of the switch cluster.

At PILOT, the switch should be 'open'.

If checking by voltage, the blue should show volts with the switch at HEAD, and 0.V at PILOT.

Re: Testing Norton Commando MKIII headlight switches [Re: L.A.B.] #662771
08/03/16 4:03 pm
08/03/16 4:03 pm
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Dnaj11 Offline OP
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Dnaj11  Offline OP
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Thank you. My ohm readings between the blue and blue and yellow correspond, but I have no lights whatsoever, and no tail light either. Is there something else common to both? Does the run/kill switch have any bearing? I do not have an owners manual for this bike. Thanks

Last edited by Dnaj11; 08/03/16 4:07 pm.
Re: Testing Norton Commando MKIII headlight switches [Re: Dnaj11] #662774
08/03/16 4:20 pm
08/03/16 4:20 pm
Joined: Mar 2006
Posts: 3,695
Norfolk, UK
L.A.B. Offline
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L.A.B.  Offline
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Joined: Mar 2006
Posts: 3,695
Norfolk, UK
Originally Posted By Dnaj11
My ohm readings between the blue and blue and yellow correspond, but I have no lights whatsoever, and no tail light either. Is there something else common to both?


The feed to headlamp switch (blue/yellow) comes from the master/ignition switch terminal 4.

All other lights (pilot, tail, instruments) are fed from master switch terminal 3 (brown/green) so I suggest you check the wiring back to the master switch and also check you have power reaching the switch from the battery (brown/blue, terminal 1).




Originally Posted By Dnaj11
Does the run/kill switch have any bearing?


No.


Originally Posted By Dnaj11
I do not have an owners manual for this bike.


Mk3 manual:
http://britmoto.com/manuals/Manuals/850_man.pdf
Wiring diagram, Section J.

Last edited by L.A.B.; 08/03/16 4:41 pm.
Re: Testing Norton Commando MKIII headlight switches [Re: L.A.B.] #662803
08/03/16 7:40 pm
08/03/16 7:40 pm
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Posts: 29
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Dnaj11 Offline OP
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Dnaj11  Offline OP
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Joined: Nov 2015
Posts: 29
Penna
Thank you. Looks like the switch is flakey. Other than that, I think its ready to start!




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