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Hi Tony,
Many thanks for the reply. I should have mentioned that the old alternator had two plugs....
So do i connect the two brown wires together?
Tony.
Hi Tony, If you have 2 plugs on the back of the alternator then that looks like a very early 15ACR alternator.
I had to refresh my memory on this one but Page 179 of the Haynes manual explains a lot.
One of the plugs has the main + Output and it also looks like a separate earth terminal.
There should be a thick brown wire here which needs to go to the top large terminal of the new 17ACR alternator.
If there is a separate thick earth wire on this connector it can be ignored as the earthing for the new 17ACR alternator is via the casing.
The 2nd connector will have a brown / yellow wire linking 2 terminals. This goes to the lower small terminal on the new 17ACR unit with the 2nd connector wire taped back.
There will also be a thin brown wire on this 2nd connector. This is the original "sense" wire and should go to the middle terminal on the new alternator. This ensures compatibility with early alternators with this Sensing function.
But yes, it will end up going to the same place as the other thick brown wire.
The circuit diagram on page 247 of the Haynes manual explains this as well. Compare it with page 249 to see the later wiring explained.
Tony.