Author Topic: battery striaght to coil? - BSA C10  (Read 1350 times)

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Offline AdminPete

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battery striaght to coil? - BSA C10
« on: November 26, 2008, 05:27:54 pm »
My grandad is rebuilding a BSA C10, the bike which didn't come with a wiring loom and hes trying to test the engine before he gets too invoved with the rest of the bike.
so can he connect the battery straight to the coil thats connects to the spark plug or is this going to cause damage?
look forward to your replies?

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From: C10_11_12 Sent: 18/11/2006 20:22
To test the engine, you can take a wire from the battery to one connection of the coil, an other wire from the coil to the distributor. Better insert a switch. If there is no connection between the coil and the distributor you will never start the engine.

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From: Setsquared Sent: 18/11/2006 23:20
But don’t forget to check the polarity is correct for the coil.
Ie, wire from – mark on coil to points and thus earth,
Pos to + mark on coil.
Neg from battery to earth.
Or vickeversa.


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From: C10_11_12 Sent: 19/11/2006 16:45
OK with you Mike.
I wrote my answer with no coil near the PC. I did not remember what could be written on it and I did not want to dig in my spare parts. On some coils (not british) markings are not + and -.
About the polarities, C10 ad 11 are sometimes with + on earth and some other with - on earth. This makes fun (???) when you get a bike with 50 years life and numerous owners and people who worked on them.

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From: Setsquared Sent: 20/11/2006 00:05
Yes it was only after hitting send, that I realised there was more then one error in my post.
Coils can as you say, also be marked CB - ~ and also be numbered like 34-28
Which would just add more confusion for the OP
On my bikes I always rewire Neg earth, but of course a C10-11 would probably be Pos earth.


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From: 46bsac10 Sent: 20/11/2006 06:12
the "WIRING DIAGRAM" in Service Sheet 808 shows C10 & C11 to be "negative earth" (as my '46 C10 certainly is). Diagram also shows coil terminal "CB" to be ground (via contact points), and "SW" to be ignition (& my coil is marked with these designations).

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From: C10_11_12 Sent: 20/11/2006 08:22
Lucas generator E3L can be used for both positive or negative earth. You just have to polarise it ( see Lucas service sheets). When you have bikes from other countries than GB, it's more easy to turn to negative eath, you make no confusion when you use a battery charger.
CB and SW stand for Contact Breaker ans Switch, which makes no confusion to connect the wires.