SOHC.co.uk Forums > CB750
wiring tidying
El__burro:
battery cables;
i need to replace both battery cables but i am not sure what to look for.
can i do it myself or better shop around.
1 guess 1 metre would do fine for both red and black.
what capacity do i need?
thanks
el__burro
El__burro:
no rear light, when i push either brake the tail light comes on (even if only the yellow/green is plugged in) strangely also the front pilot light (brown cable) comes on.
not sure what to try next.
i have followed the wiring precisely.
bulbs and wiring all good.
green is hearth?
brown is live?
yellow/green is brake switch.
thanks
el__burro
Lobo:
Hi El Burro,
Ok. What you need to do is to find the Brown / White that exits the handlebar light switch - and check that it's live (12V) when the handlebar switch is in ANY ON position. This wire then feeds the instrument illumination lamps (are they working correctly?) AND also runs back to the main ignition key switch. (so check all headlamp connectors, frame spine under tank etc)
As just mentioned, when the lights are ON (side / main / high) this Brown / White feeds 12v back to the ignition key switch, which if in the ON position then internally connects it to the BROWN coming out of the ignition key switch.
This BROWN then runs to both the front & back of the bike, to power your tail & park lights.
What's happening (somehow) is that you've wired you're brake switch GREEN / YELLOW to the tail lamp BROWN - which explains why the tail + park light is coming on as well with brake selection.
My guess is the wiring fault might be in the connectors under the back of the seat area / above the mudguard - OR some PO has substituted colours.
No matter... using your multimeter confirm you get 12v out of the YELLOW / GREEN @ brake on (IGN ON obviously) ...... and then connect this wire to either of the two tail light wires that illuminates the 21W brake lamp. ((& yup, it ought to also be a GREEN / YELLOW) (DO NOT connect this GREEN / YELLOW to the GREEN coming from the rear lamp as this should be an Earth.
Next verify that the BROWN is live @ lights switch ON (IGN ON obviously) and connect this to the rear lamp wire which illuminates the 5W tail lamp (& indeed park lamp). Again, be very careful not to connect the BROWN to any GREEN.
Clear as mud eh?
Good luck, it's only spaghetti...
Simon
PS - your prev post, bit late perhaps but I'd be thinking 120A (minimum rating)... try here
http://www.autoelectricsupplies.co.uk/product/751/category/124
El__burro:
Thanks Lobo,
After checking the brown/white wire and connecting it properly I finally have the rear light coming on ( and no pilot when braking).
The new issue is that the tail light stays on even when i turn the light off.
Other issue are
No speedo light (it could be a dodgy connections as it worked as soon as i swapped wires)
No parking light (i guess they should come on with the key in P2).
I must say that my light switch is a On Off On one.
I have wired it with the black in the middle, blue (high beam) and white (low beam) the the two other sides.
Thanks
El__burro
Lobo:
Hi again,
Forgive me, a few questions:
1/ is the bike a K6.... in which case (conventionally) the tail lamp + LOW beam came on with IGN (but were temporarily unpowered when the start switch was pressed)
2/ just to confirm, your 'new' (non-standard) handlebar switch has a central feed, and then simply switches power to one of two other wires exiting it? (Your very last sentence is confusing... "... and white low beam the OTHER TWO sides" if this last sentence is correct can you try & explain (with a diag best) how the switch works?
3/ if it is a K6, using your K6 wiring diagram provided earlier, the power feed to the main handlebar light switch should be a BROWN/RED (I think - poor quality) - you're using a BLACK which is perm live with ignition. Won't make a lot of difference other than LOW beam will remain on during cranking & make starting harder etc.
4/ does the engine starter switch have 3 wires going to it, ie a BLACK, WHITE/BROWN, BLACK/RED.
5/ yup, on the K6 (using your drag) the rear lamp should come on @ P2, inc the small front Parking lamp if you've wired it to the BROWN wire which feeds the rear lamp.
If you can answer all of the above I'll try & condense your wiring woes onto a fag-packet sketch to hopefully ascertain where it's all going wrong.
Happy Saturday...hmm.
Simon
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