SOHC.co.uk Forums > CB350/400
Headache and the brown wire mystery
exvalvesetdabbler:
The ball ache is figuring out why the front bulb isn't behaving according to the schematics before I dive in and add the extra bits.
Regards
Dave
exvalvesetdabbler:
Oops. The plilot bulb is plugged into Bn/W so explains what I have been seeing. Just need to dig out the plain brown wire socket now. Must have been like that since about the late 90s when I fitted the new headlight shell and switchgear.
Something that's not tested on the MOT so not something I would regularly test since everything worked as it should with the ignition on and lights switched on.
Been a bit distracted and stressing sorting out the MOT on my 4 wheel money puddle but this was buzzing around in my head and couldn't resist having a quick peek.
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Regards
Dave
exvalvesetdabbler:
Finally got around to building a prototype adapter for a daylight running light.
It's probably over engineered and the plan is to miniaturise it using a PCB and surface mount components then pot it.
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Ideally a polyfuse will be included. One thing that has become clear is that there is no fuse in the circuit when the ignition switch is in park with the OEM wiring. In
Park the brown wire goes to batt. With ignition and lights on the brown is fed from the 7A tail light fuse.
If the next person that comes along doesn't like it they can simply unplug it and plug the position light wire back in to the brown wire feed.
Regards
Dave
Bryanj:
Yes there is, the main 15a is in the power line to the switch
exvalvesetdabbler:
Ok, just put my other glasses on. Having the switch connection labelled Batt and seeing how the other 2 fuses were fed from the switch I assumed the worst. Non the less, it's still a bit of an odd setup having 7A protection when running and 15A protection when parked. Probably saved Mr Honda the cost of a 4 way fuse holder and a couple of meters of wire.
I am probably being over cautious wanting to fuse it down a bit with not knowing the failure modes of led bulbs with inbuilt current drive chips. A filament bulb when it pops can sometimes have a surge and sputter the remains of the filament inside the glass but the event is short lived an results in open circuit. With electronic components they sometimes just go into meltdown and not necessarily fail open circuit. With 15A protection they could make a bit of a mess before they burned up. This is why a lot of electronic devices have a non resettable thermal fuse or a resettable poly fuse embedded.
Regards
Dave
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