Converting Positive Ground to NEGATIVE Ground

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Converting Positive Ground to NEGATIVE Ground

Postby twsteph@hotmail.com » Tue Oct 18, 2005 2:56 pm

I am rebuilding my first Bugeye. I assume that they have a positive ground, like my 59 big healey. How hard is it to change the car to a negative ground system ??? What new parts to I need???

Thanks, Tim
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Postby D.Valentino » Tue Oct 18, 2005 3:47 pm

Not all of them were positive ground. The ones that were imported over here were negative ground. I did mine positive ground, pretty sure it was just a matter of switching the + & - on everything.
1955 BN2 Austin Healey 100M
1959 AN5 Austin Healey Sprite
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1951 International Metro Step Van
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Postby Frogarri » Tue Oct 18, 2005 5:35 pm

Tim, despite what D.Valentino said ALL Sprites and Midgets were positive ground until around October 1969.

That said conversion to negative ground is really very simple, i.e., switch the battery terminals (natch), reverse the two wires that connect to the coil, and re-polarize the generator. No new parts required. Sometimes, but not always the two wires to the heater fan motor will require swapping for the motor/fan to blow instead of sucking. To repolarize the generator run a temporary wire from the positive battery terminal to the generator and swipe/spark it on the "F" terminal, then reconnect the generator wires and it's done.
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Postby D.Valentino » Tue Oct 18, 2005 9:44 pm

My bad. I was at my one and only British car show, and I had alot of people ask me why I had it positive earth. I told because it's British. They all said the same thing about the negative ground being on imported ones, so I thought I just did mine wrong :?:
1955 BN2 Austin Healey 100M
1959 AN5 Austin Healey Sprite
The Original "Airport Racer"
1951 International Metro Step Van
http://www.1951snapon.blog.com/
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Postby garyfrogeye » Wed Oct 19, 2005 4:25 pm

Gary L
1958 Frogeye
London, England.
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