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Headlight, Taillight & Brake light all not working

This is a discussion on Headlight, Taillight & Brake light all not working within the Technical forums, part of the Caferacer.net Forums category; hmm....that box you made, is it supposed to be grounded? and are you using it as a ground. my earlier comments were predicated on the ...

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Thread: Headlight, Taillight & Brake light all not working

  1. #21
    Senior Member Geeto67's Avatar
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    hmm....that box you made, is it supposed to be grounded? and are you using it as a ground. my earlier comments were predicated on the idea that it shouldn't have been grounded and it was, but based on what TR said I am thinking you have a circuit in search of a ground.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
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    A tool is just an opportunity with a handle
    - Kevin Kelly

  2. #22
    Junior Member brenchao's Avatar
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    The box wasn't designed to be grounded. That kind of design is way beyond my pay grade. I'm thinking of unwrapping the harness along where the brake light wire runs and take a look see. I've inspected the wrap on the harness throughout that section of wire, and there's nothing obvious, but this problem seems to be less obvious than I'd hoped for.

  3. #23
    Senior Member TrialsRider's Avatar
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    Do what you have to, but the whole idea of meter testing is to reduce the need to rip things apart :|
    Meter test/trouble-shooting is a learned skill, I also have a dual trace oscilloscope, that's like the next level of electronics, just fancy tools unless you learn to use them well. Meter test everything! every bulb while it is in the socket, every connection and component and relate it back to the wiring diagram, if you don't understand what something does ask.

    The reason motorcycles have lots of ground wires is because lots of things need to be rubber mounted, like headlights, tail lights and signals.
    Last edited by TrialsRider; 08-15-2019 at 03:08 PM.

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  5. #24
    Junior Member brenchao's Avatar
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    Can't argue with that logic. Does the fact that my brake light wire showed some resistance against the box mean anything?

  6. #25
    Senior Member TrialsRider's Avatar
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    Connecting wires and switches should not show resistance, only bulbs and coils and solid state electronic assemblies. Your bike is pretty bone simple as electronics go, doesn't even have many relays.
    http://manuals.sohc4.net/cb750k/tech...ce/WD750UK.jpg

    ... that site won't let me link it as a picture, can you follow the diagram and understand what we're looking at?
    wire colour code is rather critical, everywhere there is a big black rectangle painted over the wire that indicates a pull apart connector.


  7. #26
    Senior Member TrialsRider's Avatar
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    See the thing called "position light" in english that would be a parking light, that and the tail light come straight off your ignition switch. If those don't work and they have good ground and working bulbs, there is a problem in or before the switch.

    ... your switch is highly suspect, unplug it and meter test the hell out of it, zero resistance between each of the posts that are suppose to be connected at each switch position. the "off" "I" and "II" indicate the key switch position, the diagrams show which posts and when they should read zero resistance.
    Last edited by TrialsRider; 08-15-2019 at 03:56 PM.

  8. #27
    Junior Member brenchao's Avatar
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    Sooo, Over a few cocktails yesterday afternoon an electrician buddy and I were chatting. He asked if the taillight was grounded. I assumed yes, but went home and checked... It wasn't. The wiring diagram shows three wires coming out of the brake taillight assembly. I only have two, and must have connected the wrong wires. The brakelight is now grounded and in proper working order. The taillight, however, is still dark.

  9. #28
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by TrialsRider View Post
    ...
    Ground wires and parts on the other hand should have zero resistance between the battery ground and almost anywhere on the motorcycle you can touch the multi-meter lead to without pealing back hot wires..
    we covered that, don't you have it fixed yet?
    I can look at it tomorrow if you can get it here :|

  10. #29
    Senior Member XB33BSA's Avatar
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    thanks for posting up trials-rasher i am still learning and as much as i hate electrical work its always good to hate with knowledge
    i did work on and off over as period of years in a friends starter/alternator auto-electric shop
    as a mechanic mainly removing and replacing components..
    2 things i learned that are very good to know and apply is to use a simple 12 volt testlight whenever possible instead of a meter ,of course a meter is important for functions that cannot be performed with a light
    but the most help[full bit was to sharpen the probe tips to perfect hypodermic needle sharpness..
    actually the angle and shape needs to be like a heavy duty sewing needle ,so that it can easily plunge thru any wire insulating covering,make a sure contact with inner strands, without causing damage
    i have never seen a new out of the package test light have the right kind of dangerous sharpness
    TrialsRider likes this.

  11. #30
    Senior Member TrialsRider's Avatar
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    You know those machines that the eye doctor uses on you to instantly determine your eye glass prescription (objective auto-refractor)
    and the ones that blow a puff of air into your eye to read your intra-ocular pressure (non-contact tonometer)
    ... for many years :I on-site serviced those.

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