Wiring help requested

slupdawg · Aug 7, 2009

I'm attempting to install a new wiring harness on my '73 roadster and I think I have most of the major components, such as alternator, regulator, and coils wired correctly (??) I'm having trouble with the wiring for the lights. Here's what I have:

From Harness:

Blue/Yellow
White/Blue

Left Handlebar:

Blue/White
Blue/Red
Blue

Headlight Shell:

Blue/Yellow
Blue/Red
Blue White
Blue

I've wired the Blue/Red wires together, as I don't see them going anywhere else. Blue/Yellow shows going from the harness to Blue on the handlebar. What about the other Blue or Blue/Yellow? Also, I don't see mention of a White/Blue anywhere on the diagram, unless I've overlooked it, which is entirely posssible. I'm lost.

Also, on my right handlebar I have a White/Red that shows it should have a corresponding wire on the harness, but I don't see one. Anybody know what that is?

I'm sure I'll have more questions later but that's enough for now. Any help is appreciated!

L.A.B. · Aug 7, 2009

Are you working from the correct 1972-74 wiring diagram?
http://rocbo.lautre.net/technique/norto ... p/151.html

slupdawg said:
From Harness:

Blue/Yellow

= (code UY) Goes to the headlamp selector ON/OFF switch in the headlamp shell, or maybe connects to a wire from the switch (see below).

White/Blue

See answer further down

Left Handlebar:

Blue/White

(UW) To headlamp main beam filament, also same wire connects to the main beam ON warning light in the headlamp shell.

Blue/Red

(UR) headlamp low beam wire.

Blue

= To headlamp selector ON/OFF switch

Headlight Shell:

Blue/Yellow

= Connects to Blue/Yellow in the harness at a guess?

Blue/Red
Blue White

Presumably from the headlamp bulb (Hi and Lo beam) so connect to same colour wires from handlebar switch?

Blue

= To blue from handlebar switch?

I've wired the Blue/Red wires together, as I don't see them going anywhere else.

Should be right.

Blue/Yellow shows going from the harness to Blue on the handlebar. What about the other Blue or Blue/Yellow?

As above, Blue/[Edit]Yellow goes to headlamp selector with Blue out to switch?

Also, I don't see mention of a White/Blue anywhere on the diagram, unless I've overlooked it, which is entirely posssible. I'm lost.

White/Blue (it's there on the diagram = WU) connects to the White/Yellow handlebar kill switch button wire at one end, and the ballast resistor (if you have points ignition) at the other end.

Also, on my right handlebar I have a White/Red that shows it should have a corresponding wire on the harness, but I don't see one. Anybody know what that is?

White/Red is not used. As it would have been the wire to the ill-fated and unreliable starter motor system that, thankfully, they decided not to fit!

Wiring help requested

slupdawg

L.A.B.

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