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B175 1969 Positive or negative earth.
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DGBland
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March 30, 2019 - 5:21 pm
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I have just bought a 69 B175 and am a bit confused about the electrics. It came with a battery (stone dead) as it has stood for many years. The owner couldn't get it started. The confusing bit is I always thought these were positive earth. However this battery was wired up to negative earth. Perhaps this is why it wouldn't start?

Which way should the battery be fitted? It appears to be the original harness and without the battery I can get a spark with the emergency ignition switch so it doesn't look as though any attempt has been made to alter the wiring. I have just ordered a new 6 volt battery and don't want to wire it up the wrong way and cause any damage

Regards

David

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mike p5xbx
E-Sussex
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March 30, 2019 - 5:28 pm
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Originally they are Positive earthed
check the connections to coil and rectifier are correct for pos earth

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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DGBland
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March 30, 2019 - 5:36 pm
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If the connections on the coil and rectifier are wrong as well. Is it just a matter of changing these connections around or do I need to do more? It is not a standard rectifier. It looks quite modern but not one I have seen before

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Mick W
Chester/ North Wales Flintshire Border
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March 30, 2019 - 6:10 pm
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It hasn’t been converted to 12 volts has it?

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DGBland
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March 30, 2019 - 6:30 pm
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I don't think so as all the wiring looks original and I have a spark without the battery using the emergency ignition switch. If it was converted to 12 volt surely the emergency ignition option wouldn't work? The two switches are original as well. It came with a 6 volt battery which was fitted by a local garage by the previous owner who took it there to be recommisioned. I am guessing the garage wired the battery up wrong unaware that it was a positive earth system. The bike had never been run since it was recommisioned 6 years ago

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Peterg
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March 30, 2019 - 7:27 pm
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What are the colours of the wires from rectifier and can you see which wire goes to earth (translucent wire)?

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