SOHC.co.uk Forums > CB750

Wiring Loom question ??

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Bryanj:
Not sure what the original wire cross section size is but I would at least double it for that distance, and solder any connectors

LesterPiglet:
You can use a smaller guage wire these days compared to what was available in the 70's. I did a bit of research last year and promptly lost all my links.  :-\

Lobo:
(For the 400F).... OEM Wiring is generally 30/0.2 strand PVC coloured cable. Modern vehicle wiring is thin wall 32/.2 (2mm 16.5A) strand hard PVC for better abrasion resistance, higher current rating, higher operating temperature and lighter weight (but not quite as flexible).

(the above words shamelessly copied from a very professional 400F rebuild blog)

(Me speaking...). The above 16.5A suggestion should be plenty for the typical loads on an old CB750 - assuming you're not loading it up with triple headlamps etc - 16.5A would be good for approaching 200W of power - (ie  more than your alternator output) - a single headlamp is typically 65W)

To get a working idea of wire rating simply sum the watts through your circuit, and divide by the voltage (12V) to get the current rating.... eg head + tail + stop + indicators might be 65W+5W+20W + 36W= 126Watts... /12 = just over 10Amps. (15A wiring good here)

Suggest you include a fuse, with a value (obviously) less than the wire amp rating.

And check your alternator output as I think it may be I the region of 13A (156W) - don't overload it!

http://www.autoelectricsupplies.co.uk/category/10

Cheers,
Lobo

LesterPiglet:
I'm useless with electrickery so I just chose a wire that had a rating a bit higher than the fuses in the bike. :)

Green1:
Your not the only one Lester I managed to blow the electric meter of the wall changing the living room lights  ???
Don,t ask me what I did I still don,t know  :-[

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