6-Volt, Negative ground???

[Mike V. Florida]

I realize this is an old thread, but I discovered that my Model A has a 6 volt negative ground setup as well. I am going to replace the generator with an alternator (I know I know), so I will have to put it back to positive ground. I assume that all that needs to be done is swapping the wires around on the coil and the ammeter. Would that be accurate? I am running LED tail lights which I had to run a separate ground for, and a electric wiper motor, and will also be installing a restored 1930's era Southwind heater (I use this car daily year round and live in Chicago where it gets pretty nasty during the winter). Thanks in advance for any advice.

They do sell both positive ground and negative ground alternators.

 

[N8IWS]

I'm looking at the same problem with our 46. In my 47 years in the field, we never touched any 6v positive ground in school.

Dale

 

[su8pack1]

If you are still running the generator all that has to be done to change to negative ground is turn the battery around and swap the cables then reverse the wires on the ammeter and coil. you will then need to polarize the generator by holding a wire across the poles of the cutout for one or two seconds and the deed is done. I have never seen a 6V negative ground alternator. The ones that the venders sell are 6V positive ground.

It's an old thread but it answered my question. Back around 1969/1970 I converted my 30 Coupe to negative ground as it was a thing back then in the local club. I want to change it back now, but wasn't sure how to polarize it. Thanks.