Understand the Positive Circuit on a Vintage Honda Motorcycle
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Our favorite analogy for the electrical system on vintage Honda motorcycles like the CB175, CB200, CB350, CB360, CB450, CB550, and CB750 families is to compare it to a sandwich. It is easy to get distracted by the multicolor wires that make up the middle toppings but you can not make a sandwich without the bread. In this video we cover the positive circuit, or the top piece of bread, to better help you understand what is happening in the middle.
Think of the positive circuit as two halves, one that runs from the battery to the key switch and another that runs from the key switch to nearly everything on the motorcycle. It is important to make this separation in your mind, as you will often hear the term " switched on 12v positive power " as the key switch plays a highly important role in both being the master disconnect as well as the point where the positive wires change colors from red to black. Be sure to watch until the end to understand not only the concept of the positive circuit but also how to practically test it and ensure it is working on your vintage Honda motorcycle.
Other Videos:
How to install a Posi-Lock fuse holder: Coming Soon
Sorting through the Birds Nest in your Headlight Bucket: Coming Soon
common-motor.com
Contents of the video:
00:00 - Introduction
00:23 - Why is the positive side of the circuit so important?
00:59 - The 2 halves of the positive circuit
01:23 - The pre-ignition switch positive circuit
05:51 - The post-ignition switch positive circuit
07:14 - How to test for 12v+ positive power
10:05 - Key points to takeaway
11:26 - Conclusion
Пікірлер: 25
I just bought my vintage Honda. Even if I live in another side of the world your videos are SO USEFUL! Thank you!
You are the boss. I’m a motorcycle mechanic here in Ghana I’m good at the mechanical aspect but i can’t seem to comprehend the electrical side. This video is a eye opener.
Thanks again for the tutorial. I love that your 350 is kinda a beater. Validates my beater!
I had an instructor, years ago, at GM training school refer to the battery as an "electron hotel ".
These videos are amazing and extremely helpful for a novice wrencher like myself! Now I can investigate the electrical system on my SL350 with confidence!
@bryanwilkinson6859
2 ай бұрын
i always wanted a cb350 from that era as a ahort haul bike.
Greatness! Your chill music was a nice touch to the content. I talked with you- Brendan, about 3 or 4 weeks ago- I make commercials ( Art Director) for broadcast / internet/ etc. You guys have really come a long way in a short time with your tutorials! You've really helped me and I'm sure many, many others with the clear and succinct way that you present the information. Just did a big shoot in Houston at the first of the month- wish I would've had time to thank you guys in person. Thanks so much again and keep it coming!!
love the demonstration with your verbal instruction. I am a visual learner so this helped me wrap my conceptual noggin on what to do next! thanks
Hi, I’ve just got a CB200 1977 and I want to thank you for your amazing professional help video on KZread. I’ve downloaded the manual so again thanks for that, really going to be helpful.. The best site for me online..
Another great tutorial...thanks so much and keep up the good work! (BTW, the purple 350 was my first bike..sorry I sold it)
Thanks for keeping my CB running.😊
Thank you for this video bro! I just received my step fathers 71* CL350 and this video helped out tremendously. I'm in Norman just up north. Maybe someday I'll swing by and say yo!!
Thanks for the explanation! I'm resuscitating a 76 cb750a and it seems to be the smallest things that are snagging me up.
Great work on videos , thank you
Currently working on an '84 Nighthawk 450, slightly newer but still a lot of helpful info
What a great video and instructor!
Black for the power out of the ignition switch seems like the worst color to choose since the ground wires are typically black also. Talk about unnecessary confusion.
could one single faulty connection cause the entire bike from not responding? After checking the battery which lit up. I proceeded to check the fuses. None of them lit. I’m going back to see where the connection between the battery and fuses got disconnected.
If I have a 76' CB550, should my ignition red wire be tied into the positive battery terminal? I can't find a wiring diagram that points it to connect there?
I have a 81 hknda passport c70 , I'm getting power from the battery to the starter solenoid thru the red fuse wire up to the red wire on the key switch , but when I turn the switch to on I don't get any power out the black wire , which is giving me problems with the lights,.I have no tail light or brake and the signals not the horn work . I'm not getting power to the small wires on The starter solenoid . So I jumped a wire from the positive battery post to the small black wire on the starter solenoid and my brake lights come on and the front turn signals and cluster light like the neutral and high beam . Any ideas? I'll appreciate any tips thanks
Where can I buy a batter for a ‘67 cl77 305 scrambler?
I like sandwiches.
I'm a CMC fan and purchase parts for my 18 or so various Hondas. The sandwich analog is not at all helpful.
The background music is a real distraction and irritant.
You have explained slightly incorrectly but helpful video as always... Positive pushes in a dc system and both positive and negative push in ac... Ps the bread analogy is terrible 😉😁