From: Fred Martin (mung@in-touch.net)
Date: Sun Jan 02 2005 - 22:23:11 PST
Noel...the old tractors were positive ground and when they change them
over to negative earth, they mention about changing the two small leads
on the coil...as I recall one side has a plus sign (+) on it. You'll
know more about it than I do and which way to hook it up to be right for
his situation. Fred Martin
noel shelley wrote:
>Hi Mike ,
> Firstly Happy New Year , Now to business ,Talking off the top
>of my head , I will assume that your vehicle is set up with a Dynamo .
>To change from + earth To - earth some times happens by accident , it`s that
>easy . Since I`m also assuming the vehicle is old --ish i.e. no electronics
>, the only thing that May have to have it`s wire transposed is the ammeter
>if it`s got one!
>DISCONNECT the battery ! Now check that there are no electronic devises eg
>flasher unit !
>The lights , starter ,fuel gauge Etc are not polarity sensitive so now
>reconnect the battery , NEGATIVE to EARTH ,BUT disconnect the DYNAMO . Take
>a wire from the battery +and briefly hold on the field terminal of the
>dynamo , there will be a small spark , but don`t worry thats normal . The
>field terminal will be the smaller of ,normally only two . You have now set
>the residual magnetism to a neg earth system --- simple . reconnect the
>DYNAMO and all should be well .
>I`m assuming that the return {earth } is via the frame of the dynamo ! if
>not then this must be connected before repolarising !
>
>
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