SOHC.co.uk Forums > CB500/550
500 four rectifier
Woodside:
Ok
So rectifying wise it should do the job.....but I'm guessing it being switched via the lights it steps up some to.cope with the extra load...
The 450 it's going on only has front / rear plus brake light.
Other than that it's pretty much for charging the battery so can I illiminate the switched coil?
Lobo:
Mjc... I really should 'consider' before posting! Have now done a bit of background grubbing on the CB450 and, typically, come across differing wiring diagrams, differing 'informations'.... it all gets so bloody difficult when something's just not in your hands...
It seems your bike has a permanent magnet generator (no generator exciter coil).... and some sources suggest no regulator... as the charging setup just so relatively weak. Dunno, again, Brian / any older CB riders (ie the bikes, not the individuals!) might be better qualified to help.
But, here goes my take on it.
Brian (as always) is correct that headlamp switching is involved... one source of info I read / wiring diagram says the switch 'simply' provides / connects one 'raw AC' winding up to the lights - ie the lights run on 12v AC. (seems unlikely I'd have thought). And yet another diagram / words of wisdom suggest that the generator normally supplies 2/3 power, but at lights on adds in another coil to give full power.
My best guess, is the latter, with the white & yellow (generator) wires being connected at lights ON. From the 'best' wiring diagrams I can find I'd suggest you directly connect the white / yellow loom wires within the headlamp bowl (tape the switch connections up)... and then connect the pink / yellow wires from the generator to any 2 Yellows of your CB500 rectifier. And then, if you have a voltmeter, confirm charging voltage all in limits.
Sorry can't be of more help,
Simon
Woodside:
Cheers Simon
When you say "sorry I wasn't any more help". Are you kidding? Other than coming and wiring it up for me that's great......and that's not a hint....
I guess I should have said up top that I have no loom and all wiring is to be made from scratch.
But thanks again that's fantastic
Best tool in the box this week "sohc forum"
Lobo:
You're welcome, but sorry... no guarantees. Much written on CB450 forums, the electrical system does not seem particularly, er, robust! Read one alarming bit where the electrics failed and fault eventually traced to the tacho cable being disconnected.... this was the handlebars 'Earth' since the steering head bearings were failing to pass current! Anyways, will be interested to hear how it pans out.
Btw, have you a voltage regulator in the system?
Oh, and please... anyone out there have better / hands-on knowledge of old CBs & this topic speak up, I'm no guru & working a bit blind from Google bits'n'bobs.
Cheers again,
Simon
Woodside:
Hi simon
Thanks again
I reckon I can sort this now.....
I only need it to charge the battery so it will keep the starter happy.....
I will be fitting lights maybe sometime....I can't load a picture at the moment of the project but I will try again soon....
It has no wiring as we speak so its all abit of a work in progress .....arnt they all???
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