positive ground to neg ground

[pace]

How do you change the ground from pos to neg on a TR3A?

 

[Opa]

pace
Google ISOA tech tip 1997.Joe Pawlak wrote up a nice article on the subject.Not that hard to do really.
Hope it helps ya.

 

[Andrew Mace]

There's also a good writeup here from the Vintage Triumph Register.

 

[TR3driver]

Not mentioned in either of those articles (that I can see) ... on the original coils, the "CB" terminal will now get the white wire from the harness and the "SW" terminal will get the wire from the distributor.

Also, the battery clamps are a slightly different size, so pay careful attention that they fit down over the battery posts but still grip firmly. You may not be able to get that with the original 'helmet' terminals; so this might be a good time to replace the lead to the starter solenoid with a modern, red cable.

 

[Geo Hahn]

Obviously any polarity-sensitive items already installed must also be considered... in particular if you have a Pertronix ignition I believe this change will require replacing that with a negative-ground version.

I assume you have a pressing need for negative ground since you didn't ask about the 'whys'.

 

[pace]

Thanks for all the replies. George, a friend of mine asked for this info because he wants to install a neg ground radio.

Mike