Author Topic: conversion to 12v  (Read 816 times)

Offline oldbeezageezer

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conversion to 12v
« on: 02.06. 2015 10:29 »
My A10 magneto is shot so I have gone the 12v, electronic ignition route (Thorspark, DVR2 and AGM battery).
Most of bits removed and at the point of installing new electronics. First issue is where to locate the coil! Installation info suggests under the tank but there doesn't seem to be enough room there. 2nd suggestion is under the seat but then the HT leads aren't long enough.

I think I saw photos a while ago of a coil in place but I have searched on the forum and can't find it now.

Has anyone done this conversion and have pictures or know where to get picture of coil in situ?
I am also going to upgrade the battery earth wire. Any suggestions for cable size?

Many thanks
1954 A10
1972 CB 350 K4
YAMAHA XV750
1999 CBR600

Online Triton Thrasher

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Re: conversion to 12v
« Reply #1 on: 02.06. 2015 18:11 »
In answer to your actual question, extend the HT leads.


My unsolicited advice is don't throw the mag away yet.


Online bsa-bill

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Re: conversion to 12v
« Reply #2 on: 02.06. 2015 18:45 »
Fastened my coil to the large hole at the rear of the top frame rail (was a sidecar fastening point I believe)
the coil is fixed to a flexible alloy strip which is insulated with heat shrink (in the unlikely event it should foul a battery terminal), the alloy strip is fastened to the afore said frame hole with a single bolt arrangement such that it can be slackened a little and swung around to gain access to the battery.
not sure what is on for tomorow but if time allows I'll get a photo
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online morris

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Re: conversion to 12v
« Reply #3 on: 02.06. 2015 21:40 »
Hi oldbeezageezer, could it be you where looking for this?;
http://www.a7a10.net/forum/index.php?topic=8219.msg57922#msg57922
The picture of the coil and how it is fixed is a bit unclear though, but I drilled two holes in the tank strap, and bolted the coil onto that
Here's a couple of better pictures;
'58 BSA A 10 SA
'52 BSA A 10 Plunger
'55 MORRIS ISIS
The world looks better from a motorbike
Belgium

Offline kiwipom

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Re: conversion to 12v
« Reply #4 on: 02.06. 2015 22:41 »
hi guys, this is where i put mine, cheers
A10.G.Flash(cafe racer)Honda 250 vtr. Yamaha Virago XV920.

War! what is it good for?Absolutely nothing, Edwin Star.
NewZealand

Offline oldbeezageezer

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Re: conversion to 12v
« Reply #5 on: 03.06. 2015 09:14 »
Thanks for the info guys. It's given me a couple of options to look at. I like the tank strap idea (thanks for the link Morris) and the wiring would fit in nicely with my plan to replace the steering lock with an ignition switch. If it will fit in the hole.

I am not doing away with the mag. I have bought a unit from sussex motorcycles that fit in place of the mag points set up.

Did any of you beef up the battery earth cable?
1954 A10
1972 CB 350 K4
YAMAHA XV750
1999 CBR600

Offline Johnny J

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Re: conversion to 12v
« Reply #6 on: 03.06. 2015 09:58 »
my plan to replace the steering lock with an ignition switch. If it will fit in the hole.

Do you know if there are any ignition switches that still has the steering lock part that will fit in the hole?
   Gothenburg, Sweden

Offline oldbeezageezer

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Re: conversion to 12v
« Reply #7 on: 03.06. 2015 16:57 »
I don't know of any ignition/lock that will fit in the steering lock hole Johnny. My ignition switch is too small for the hole so looks like I am putting it in the headlamp nacelle.

I have also changed my mind about the coil location. I am now going for under the battery box. Bit more work involved and I will probably have to get a longer HT lead, but it hides it away nicely.
Checking locations and wiring diagrams I have found that the existing wiring connections leave a lot to be desired so more work checking and re doing them!

I don't remember having this hassle back when I were a lad terrorising the neighbourhood on my Super Rocket. Still both 50 years older so to be expected I suppose.
1954 A10
1972 CB 350 K4
YAMAHA XV750
1999 CBR600