C15 Overcharging - I think?

[limeyrob]

One thing some people do is to replace the ammeter with a voltmeter, this makes a lot more sense with an alternator and some have fitted a small digital voltmeter in an old ammeter case.

[Stevieo]

Thankyou, good idea about the voltmeter.
Well i have an update and its not good, installed new battery, coil and reg rec, all 12v - no bulbs yet as they didnt arrive.

All wired in as standard except for the stator going directly to the regulator.

There was no spark at all, fitted the old 6v coil albeit in a now 12v system and got a good spark again, and also started.
So have I gone and bought the wrong 12v coil - mine seems to have liquid inside it, oil maybe? and its a fair bit bigger than the old one too, has 2.9 ohms across the terminals, its this one - https://www.ebay.co.uk/itm/356763950400 - btw the new 12v coil also gets very hot too and def wired up ok.

If anyone had a recomended 12v then id be glad to hear what you think,

thanks
Steve

[Tigerfeet]

https://www.ebay.co.uk/itm/331633479355

I spent quite a bit of time researching coils, as my electronic ignition system (pazon) has specific requirements. I ended up with this one - basically what BSA would have been fitting on 12v bikes. (Except that it is now no doubt built in the Far East.) Its working perfectly.

[Stevieo]

Thanks for that..I've got that ordered now and will post back if it's any better.

[Stevieo]

Im so sorry for dragging out this thread but im a bit confused, I dont have the new lucas coil just yet but im really beginning to wonder about the coil wiring,

previously in the running 6v system (albeit overcharging) the wiring was as follows-

coil positive - 2 black and white wires, one to ignition and one to condenser / points
coil negative - 2 white wires, one to ignition and one to another switched supply, brake light switch i think.

Now for the 12v wiring when my new coil comes I was planning on the following -

coil positive - 1 black and white wire to the condenser / points
coil negative - still 2 white wires to the same place as the 6v.

the only difference being there is no black/white to ignition as this is for the emergency position (I have capped this off at ignition along with the black and the green/yellow for alternator.

my problem is that google ai keeps saying its recommended to connect the coil positive straight to the frame, how can this work or is it wrong info?

Thanks for anyone that still has an interest, I hope I get to close this soon :-)
Steve

[rhyatt]

Upon conversion, your coil is pretty much the same wiring as it was.
Correct , you don't need the emergency wire.
If you've also converted to negative earth , then the wire coming from the points and condenser must go to negative terminal on the coil.
The ignition switched supply wire must go to the positive side of the coil.
Hope that helps