Author Topic: Help me understand this wiring diagram  (Read 551 times)

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Offline mickey_7106

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Help me understand this wiring diagram
« on: April 06, 2016, 10:28:12 AM »
i had a difficult time figuring out why my tail light wouldn't work. i understand how all these wires connect to the bike but im having a hard time understanding how they get power.

Background info i installed a new phase 7 led headlight with bucket.  There wasn't enough slack in the wires for me to stuff them back in the bucket so i left them out. somewhere in the process i lost the tail light  (brake still worked), gauge lights, oil and neutral indicator. Yesterday i unplugged every connector that meets at the front forks and started fresh making sure everything is plugged where it should be. the only thing that was different was that my front turn signals only have two wires and now i have day time running lights ( They didn't light up before unless to turn). looking at this diagram i realized that they were originally 3. After everything was plugged in everything else worked exept the tail light. after a lot of testing i realized there was a small "jumper" wire that i had no where to plug it to according to this diagram.  i plugged it to the front brown to a black and my tail light can on! i spent hours tracking this down and it was a simple "fix" 




So  i see that battery power from fuse goes to the keyed ignition switch, Which then powers black, Brown/white and brown right? i couldn't get any power from brown so does that mean the ignition switch needs repair or be replaced? i Checked for conductivity from the front brown wire that shouldn't be plugged to anything all the way to the contact point of the bulb and there was no break in the line.

Check diagram i posted
1. what do those dots mean? Solder points?
2. is that a diode?
3. There's a P on my ignition but i cant turn the key to that position. Does that translate to PA on this diagram? whats it for?
4. how can i read these boxes to interpret them better?

BTW is there a reason for all these wires to be wrapped in tape and not wire loom? and lastly the running lights turn off when i switch to high beam, is that normal?

TIA



Offline madmtnmotors

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Re: Help me understand this wiring diagram
« Reply #1 on: April 06, 2016, 11:41:33 AM »
1. what do those dots mean? Solder points?

Yes

2. is that a diode?

No

3. There's a P on my ignition but i cant turn the key to that position. Does that translate to PA on this diagram? whats it for?

Probably. The "P" position on my later model 750 is one click past the "Run" position. Sometimes takes a little fidgeting to turn to the PArk position. The PArk position illuminates the tail light only. Not a feature that gets used very often...

TAMTF...


Wilbur



Projects:
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"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
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Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
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Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
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Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
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