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Old 05-11-2008   #1 (permalink)
fominoz
New Member
Production 125
 
Join Date: Aug 2007
Location: Brisbane, Australia
Posts: 7
1982 T140ES negative/positive/negative ground..??

Dear All,

I do have a 1982 T140ES (the electric start was removed by PO though) with Boyer ignition, and discovered that she has positive ground.

As per my understanding/reading, from about 1979 the T140s were negative ground..!!?

So now i am wondering if this would be the issue of the bike not charging properly and having all sorts of smaller electrical issues.
I can only guess that some PO (or workshop by accident?) changed the bike from negative to positive ground.

So now the big question is WHAT has been changed to work on positive ground, what has not ?

Just assuming that PO only put the battery in the wrong way (positive ground), what would have happened?
Would the bike potentially still run/work or would it not ?
Would the Zener Diode work or not ?
Would the rectifier work or not ?
Would the Boyer still work ?

Essentially i would like to return the bike back to negative ground and i have found a few tips to convert a positive ground bike to negative ground, however now i am faced with converting a (wrongly) converted bike back ...

I guess my main question is: what happens (could happen), if i just went and changed the battery around again, just swapping the positive and negative and not touching anything else (rectifier, zener, coils and boyer)?

Thanks for your thoughts/ideas!
Fom
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