Wiring nightmare

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captwk

captwk

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Apr 26, 2012
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Opened my headlight and it looks like spaghetti junction... Wires taped, hanging loose, bare wires..
Bought a new wiring harness and it looks totally different from whats there. Thinking I need to replace the main to match up.

Any idea what this long wires goes to? Brown and a double white wire.


Wiring nightmare
 
It appears to be coming out of the headlight loom so i would assume it's for the front brake. Run it back out of the headlight and up the handlebars to the switch on your master cylinder.

There should also be one for the rear brake.
 
Thanks Joe, not by the bike right now but do the 73 750's have a front brake switch? I will look later...
 
It's only a nightmare if you haven't done wiring before or if you are color blind like me.
My 14 yo daughter helped me with the colors but I found with a new harness and the way they are setup the wires go right to the spots they belong.
What I did was leave all the wires connected to all the relays, capacitors, etc. cut the wires leaving about 2 inches still connected and routed the new harness to all the spots and then hooked them up by pulling 1 wire at a time.
A manual helps too
 
btw you're not alone out there.
I'm in the mid of wiring nightmare trying to set a whole new harness not only the headlamp.
Guido, that was a good reco - if I only read that before taking the old harness off...

at the moment I end up with lots of stuff that does not seem to have a place to go - I reckon this is for interpol isn't it?


Wiring nightmare
 
and another question:
there is a red-white wire coming from the left handlebar switch. from the diagram it does not seem to go anywhere. in the drawings you see it goes from the switch to a connector (one of those black things...) and that's it.
this clearly does not make any sense.


any hint anyone?
 
Orsonoce said:
there is a red-white wire coming from the left handlebar switch. from the diagram it does not seem to go anywhere. in the drawings you see it goes from the switch to a connector (one of those black things...)
Click to expand...

Actually white/red [WR] (white with a red tracer) and was originally intended to connect the handlebar pushbutton to the starter motor solenoid the factory intended to fit in 1971, so WR is unused and goes nowhere.
 
Orsonoce said:
btw you're not alone out there.
I'm in the mid of wiring nightmare trying to set a whole new harness not only the headlamp.
Guido, that was a good reco - if I only read that before taking the old harness off...

at the moment I end up with lots of stuff that does not seem to have a place to go - I reckon this is for interpol isn't it?


Wiring nightmare
Click to expand...
I've got those "extra" wires too.
I also don't have any turn signals either so I have 2 extra leads in the rear tail light piece.
I hooked up all I could, tried all the switches and everything worked so I just left those extras alone after wrapping them up of course.
I bought my harnesses from Commando Specialties, bought some male/female bullet connectors from Napa Auto which are real close to the original kind and I was of to the races,,, so to speak.

I also always take pics of anything I am not familiar with before ripping into it.
You know what they say, "a picture is worth no PITA later" or something like that.
 
thanks folks - just unsure about 1 last thing:
to which if these do I connect the white wire coming from the Boyer unit> instructions not too clear there. I got a choice of a short white and blue, or 2 long yellow and white (as you can see in the pic.).

thanks.
BTW grt progress: lights and horn work OK! that proves that 'electrics' is a a random science...
 
Orsonoce said:
to which if these do I connect the white wire coming from the Boyer unit> instructions not too clear there. I got a choice of a short white and blue, or 2 long yellow and white (as you can see in the pic.).
Click to expand...


If you check your diagram, you will see that the ignition feed from the kill switch is white/yellow [WY] which is what I believe I can see in your photo and not "yellow and white" (always quote the main colour first followed by tracer colour to avoid confusion) therefore the white Boyer wire can be connected to white/yellow if the handlebar kill switch white/yellow is connected to harness white yellow and not white/blue [WU] as shown on the diagram, however I'm puzzled why there is a double white/yellow with a spade connector at all, as that doesn't match the wiring diagram?
 
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