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Author Topic: 1977 CB750K Wiring  (Read 1243 times)

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Offline shotty750

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1977 CB750K Wiring
« on: December 10, 2015, 09:13:46 AM »
So, I've been getting some guidance from a forum member here but he's currently out of town. I was thinking about finally working on the wiring but I really have no experience with this kind of stuff. Anyways, I was told I should get a '76 harness because it would be easier to install/work with. Is there any thing out there showing pic by pic the way to install the harness? I do have the wiring diagrams but I'm not even sure what each color wire on the harness would be. Any help is welcomed! Thanks! :)
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'77 CB750K

Offline flybox1

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Re: 1977 CB750K Wiring
« Reply #1 on: December 10, 2015, 09:19:29 AM »
Is your wiring diagram not in color?

« Last Edit: December 10, 2015, 09:21:05 AM by flybox1 »
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline madmtnmotors

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Re: 1977 CB750K Wiring
« Reply #2 on: December 10, 2015, 10:20:43 AM »
The parts fiches can be a good source for information too. Here is the basic orientation of the main harness:

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TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
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/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
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
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Offline shotty750

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Re: 1977 CB750K Wiring
« Reply #3 on: December 10, 2015, 11:33:16 AM »
Quote from: madmtnmotors on December 10, 2015, 10:20:43 AM
The parts fiches can be a good source for information too. Here is the basic orientation of the main harness:

Thanks. I do have the diagram as flybox has posted. This wire loom diagram may help me out even more. Where did you find it?
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'77 CB750K

Offline madmtnmotors

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Re: 1977 CB750K Wiring
« Reply #4 on: December 10, 2015, 11:37:07 AM »
Parts fiches are used by the Honda dealers for online parts lookup. CMSL, Motogrid, Service Honda, DSS, and others.
« Last Edit: December 11, 2015, 06:42:52 AM by madmtnmotors »
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TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
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/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
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
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Wobbly

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Re: 1977 CB750K Wiring
« Reply #5 on: December 10, 2015, 12:34:26 PM »
Quote
Anyways, I was told I should get a '76 harness because it would be easier to install/work with.
Yes, get the wrong harness from the K6 for your K7. That's certainly is going to make it a lot easier to connect everything. Who told you that?  Some three-year old? The reason behind such a statement escapes my logic. But then I am not the intellectual type. I would be leaving town too after giving such advice.  I got the K7 wiring diagram. But you already have that--so you say. Well, good luck.
« Last Edit: December 10, 2015, 12:36:06 PM by Wobbly »
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Offline shotty750

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Re: 1977 CB750K Wiring
« Reply #6 on: December 11, 2015, 06:22:14 AM »
Quote from: Wobbly on December 10, 2015, 12:34:26 PM
Quote
Anyways, I was told I should get a '76 harness because it would be easier to install/work with.
Yes, get the wrong harness from the K6 for your K7. That's certainly is going to make it a lot easier to connect everything. Who told you that?  Some three-year old? The reason behind such a statement escapes my logic. But then I am not the intellectual type. I would be leaving town too after giving such advice.  I got the K7 wiring diagram. But you already have that--so you say. Well, good luck.

I'm not going to name names as he is a long time member of this forum and has many years of experience working with CB750's. My thought process was to get the K7 harness as well but I was following his guidance. And yes, I do have the K7 diagram.
« Last Edit: December 11, 2015, 06:47:40 AM by shotty750 »
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Offline hsas.69

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Re: 1977 CB750K Wiring
« Reply #7 on: December 11, 2015, 06:41:59 PM »
I personally dont know the differences of the k6 and k7 harnesses but there may have been some modifications you are doing to your k7 that may make more since to use the other harness.... but to me the correct harness would be the way to go.

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