Author Topic: Electrical Diagram Does Not Compute  (Read 776 times)

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Offline John G

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Electrical Diagram Does Not Compute
« on: July 12, 2022, 01:27:28 PM »
Did I ever tell you how much I HATE electrical. With my nice new main wire harness that came with the bike (which I recently purchased) installed it's time to hook up the rats nest of wires. Looking at all the pictures I took I figured; how hard can it be. Looks like I need a wiring diagram. Ok. Looking at the wiring diagram I thought I would start at the easy stuff so I look at the three wires for the right turn signal light. Yeah, I think I understand where they're going. Three wires; hmmm. The wires that are coming from the right turn signal light are the wrong color and there are only two wires. #$%@%&&^(*^ Is it me or do you need a degree in brain surgery to figure this stuff out. Does anyone have a better wiring diagram I can follow. Black wires with white tape. Three wire into a junction terminal and I still more of the same color wires. Do you think a HONDA Shop would be able to figure it out? Crazy.  Did I ever tell you how much I HATE electrical
John G.

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Electrical Diagram Does Not Compute
« Reply #1 on: July 12, 2022, 02:29:20 PM »
3 wires would indicate each side has a running light AND a turn signal for the front only.

Supposed to be as easy as connecting like colors  :-\
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline newday777

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Re: Electrical Diagram Does Not Compute
« Reply #2 on: July 12, 2022, 03:48:46 PM »
When you say 3 wires do you mean the 2 orange, orange/white, and the ground?? Otherwise you will have to be more specific.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

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Re: Electrical Diagram Does Not Compute
« Reply #3 on: July 12, 2022, 03:49:44 PM »
And what bike is this on?
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline John G

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Re: Electrical Diagram Does Not Compute
« Reply #4 on: July 12, 2022, 04:57:55 PM »
Thanks Guys. More less looking for sympathy. I hate wiring. I have to figure out how to list my bikes and at least let you all know what I' working on. I'm very excited to have this bike. The motor still has to come apart and reassembled. It is in very good shape. Always stored inside. Only has 16K on the speedometer. Likely not 116K but they original owner before he passed away stared a restoration which I will do. It's a 1975 CB750K.
John G.

Offline newday777

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Re: Electrical Diagram Does Not Compute
« Reply #5 on: July 12, 2022, 05:56:34 PM »
Thanks Guys. More less looking for sympathy. I hate wiring. I have to figure out how to list my bikes and at least let you all know what I' working on. I'm very excited to have this bike. The motor still has to come apart and reassembled. It is in very good shape. Always stored inside. Only has 16K on the speedometer. Likely not 116K but they original owner before he passed away stared a restoration which I will do. It's a 1975 CB750K.
Cool!
I just happened to plug the rats nest back together today on my 75 K5 Planet Blue after changing the handlebars, so I understand......
I still remember swearing at the Japs for putting so many wires in such a small space changing the handlebars back in the 70s when I had to stay late after a 12 hrs day as Parts manager and having set up parties till the wee hours of the night and of course the new owners wanted higher bars on their bikes...amongst other touring accessories.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline John G

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Re: Electrical Diagram Does Not Compute
« Reply #6 on: July 12, 2022, 06:17:29 PM »
We have the same bike. Nice. Mine still has the original exhaust and wheels. The paint job looks blue but apparently its called an off green or something like that.
John G.

Offline newday777

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Re: Electrical Diagram Does Not Compute
« Reply #7 on: July 12, 2022, 07:15:43 PM »
The K5 only came in Planet Blue and Flake Apricot Red. There was a green(Freedom Green Metalic)in 74 though.
The K4 had smaller turn signals than the K5 too.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline PeWe

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Re: Electrical Diagram Does Not Compute
« Reply #8 on: July 12, 2022, 09:53:05 PM »
I used both Honda diagrams found in the CB750 shopmanual and colored simplified versions found in the diagram download section.

I built my CB750 K2 with stray parts. New aftermarket main harness (loom), aftermarket bar switches. All wiring new.
It worked direct. Except for LED pilot bulbs of bad quality that popped within minutes. Stock versions in saved the day.
I had to think extra about the blinker buzzer since I had one with 3 wires (probably G1000 version)

The bar switches verified with a buzzer before connecting them. I marked the wires with tape to be sure. Some wires have not same colors as stock.

I have also seen 3 wires to fron blinkers in the diagram. Not on my bike.
This on US bikes only with that type of blinkers and bulbs with 2 functions (like rear lamp with brake)
Just follow diagram and connect.
I did the same on my K6 that got new bar switches where functionality was checked before connection.
Never a problem.
Only issue I have had was the jumper wire between brown and black, almost invisible in the diagrams.
I think it was the instrument voltage not functioning without it.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline newday777

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Re: Electrical Diagram Does Not Compute
« Reply #9 on: August 08, 2022, 07:03:17 PM »
Thanks Guys. More less looking for sympathy. I hate wiring. I have to figure out how to list my bikes and at least let you all know what I' working on. I'm very excited to have this bike. The motor still has to come apart and reassembled. It is in very good shape. Always stored inside. Only has 16K on the speedometer. Likely not 116K but they original owner before he passed away stared a restoration which I will do. It's a 1975 CB750K.
John
Did you get the wiring figured out?(you left your thread hanging unfinished....)
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Don R

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Re: Electrical Diagram Does Not Compute
« Reply #10 on: August 09, 2022, 04:59:24 PM »
I like wiring them, too bad you don't live closer.  I even converted a 400F to European switches and lights just for fun.
No matter how many times you paint over a shadow, it's still there.
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