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C15 rectifier

PostPosted: Mon May 12, 2014 8:39 am
by christoff
Hi all,
Recently rebuilt a 1961 C15, as part of the rebuild meant making a new harness I converted the bike to 12v system, no problem running the bike or with the lights etc, but when I connect the stator out put wires to the rectifier it immediately begins to heat up (bike not running ) after a minute or so its too hot to handle any ideas greatfuly accepted.
Cheers

Re: C15 rectifier

PostPosted: Tue May 13, 2014 7:52 am
by Welsh Wizard
check here for the wiring, as it would seem you are shorting out on the loom.
http://www.bsa-c15.org.uk/c15_alternator_wiring.htm

http://www.bsa-c15.org.uk/c15_12v_conversion.htm
On the last link check the wiring re diodes as it is very easy to be out if it the old Lucas type.

Re: C15 rectifier

PostPosted: Thu May 15, 2014 7:07 am
by Tman
If the engine's not running but the rect overheats only when you connect the battery across it I'd say the rect is shagged. Did you fit a nice new solid-state rect or reuse the old selenium jobbie?