one more om batteries

[cardoza]

I purchase my 1928 a few years ago, but it is now when I realized that the battery is connected negative to ground (as you can see I rarely used the car) and now I have to replace the battery. (6 volts)

The question: what will happen if I reverse the connection (positive to ground)?

1.- starting electric motor will run the engine backwards?
2.- generator will generate reverse polarity (burning the battery)?
3.- nothing will happen

I cannot find any markings on the starter motor or generator that will indicate that they are negative to ground.

Any procedure to follow, indication, hint, or help, will be appreciated..thanks