SOHC.co.uk Forums > CB350/400
Which wire
McCabe-Thiele (Ted):
The earths were originally attached to the brackets that hold the winker. Mine were long rotted away so I connected fresh earth wires from the lamp bases to the loom.
If we're talking about the same shroud it sits just under the seat peeking above the plastic rear mudguard.
oldchuffer:
Thanks Ted, i've just seen you have asked this before, complete with a pic. Ignore my PM.
Oddjob:
Rear light normally has 3 wires, brown, green/yellow and a green for an earth to the rear light itself as it's normally rubber mounted so doesn't have a good earth against the body. The earth wire normally has a spade connector on it whilst the other 2 are normal bullet connectors.
Lobo:
Personally, I’d be trying to keep the wiring as close to standard as possible - it simply avoids headaches down the track. It also allows you / any subsequent owner to revert to OEM equipment without any worries at any time.
If I remember correctly, the CB400 has 3 fuses, inc a 7A fuse on the Taillight circuit. DON’T use 3A wire into this circuit, as if there is a short your new wire will begin to smoulder / smell / spoil your day long before the fuse blows. Ie use wire > than the fuse in said circuit. (It doesn’t matter if you use LEDS or not… a short circuit will basically connect the live wire directly to earth… and you need the fuse to blow FIRST)
You might instead change the fuse in question to a 3A …. if so make sure you know what else there is on that circuit and whether this is a viable option - I can’t remember.
Finally those new connections. ALWAYS put the shrouded Female on the supply (battery) side of the connections, and the bullet towards the component (ie bulb). In this way, if a connector undoes, the jiggling (live) female side will not short to the frame / Earth.
McCabe-Thiele (Ted):
--- Quote from: Lobo on April 14, 2022, 12:02:07 PM ---Personally, I’d be trying to keep the wiring as close to standard as possible - it simply avoids headaches down the track. It also allows you / any subsequent owner to revert to OEM equipment without any worries at any time.
If I remember correctly, the CB400 has 3 fuses, inc a 7A fuse on the Taillight circuit. DON’T use 3A wire into this circuit, as if there is a short your new wire will begin to smoulder / smell / spoil your day long before the fuse blows. Ie use wire > than the fuse in said circuit. (It doesn’t matter if you use LEDS or not… a short circuit will basically connect the live wire directly to earth… and you need the fuse to blow FIRST)
You might instead change the fuse in question to a 3A …. if so make sure you know what else there is on that circuit and whether this is a viable option - I can’t remember.
Finally those new connections. ALWAYS put the shrouded Female on the supply (battery) side of the connections, and the bullet towards the component (ie bulb). In this way, if a connector undoes, the jiggling (live) female side will not short to the frame / Earth.
--- End quote ---
Interesting logic you have put forwards never looked at it like that - presumably the fuse will blow when the current exceeds the sum of all the items on the circuit plus you would also allow extra to avoid a voltage drop down a long wire route. I generally find that the wire I have in stock is never less than 1.5 mm so I tend to slightly over design and go for 2.0mm but then you can have a new mini loom that will not fit through an apperature e.g. hole in rear mudguard.. Presumably the tail light fuse would include F & R light, instrument lights & stop lamp.
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