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Two wire Pre-unit alternator #355691
01/30/11 9:41 pm
01/30/11 9:41 pm
Joined: Aug 2008
Posts: 1,429
Minnesota, US
Jim Hultman Offline OP
BritBike Forum member
Jim Hultman  Offline OP
BritBike Forum member
Joined: Aug 2008
Posts: 1,429
Minnesota, US
Just curious about the alternator on my '61 Bonneville. The setup doesn't look like what's in the parts book....



And the alternator only has two wires, white/green and yellow/green.



Those of you familiar with these set ups, does this look right?

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Re: Two wire Pre-unit alternator [Re: Jim Hultman] #355693
01/30/11 9:48 pm
01/30/11 9:48 pm
Joined: Aug 2001
Posts: 7,427
scotland
triton thrasher Online content
BritBike Forum member
triton thrasher  Online Content
BritBike Forum member
Joined: Aug 2001
Posts: 7,427
scotland
That's a much later (and much better) encapsulated alternator. Should be wired as later 12V Triumphs, with a Zener diode or electronic regulator.


Amateur Loctite enthusiast.
Re: Two wire Pre-unit alternator [Re: Jim Hultman] #355697
01/30/11 10:09 pm
01/30/11 10:09 pm
Joined: Aug 2008
Posts: 1,429
Minnesota, US
Jim Hultman Offline OP
BritBike Forum member
Jim Hultman  Offline OP
BritBike Forum member
Joined: Aug 2008
Posts: 1,429
Minnesota, US
Thanks! Looks like a fairly nice adaptor plate and, as you say, a later alternator stator. Must have been a period "improvement". I'm fine with that.

Rotor clearance is very large, but I suppose I'll just have to wait until I get it running to see if it produces anything.

Re: Two wire Pre-unit alternator [Re: Jim Hultman] #355708
01/30/11 10:47 pm
01/30/11 10:47 pm
Joined: Aug 2001
Posts: 6,972
Vermont
Jon W. Whitley Offline

BritBike Forum member
Jon W. Whitley  Offline

BritBike Forum member
Joined: Aug 2001
Posts: 6,972
Vermont
Jim,

I did the same conversion to my '57 6T. Pretty straight forward operation and that is the stock adapter ring.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project


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