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Old 03-16-2019, 09:27 AM   #21
JSeery
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Default Re: positive to negative change

A photo of the battery would help.
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Old 03-16-2019, 09:52 AM   #22
rotorwrench
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Default Re: positive to negative change

The battery conversions started with removing the tar and lead plates from the old original Ford battery cases them modifying them to hold a late type Optima 6 volt batteries. Later they started manufacturing new "look alike" cases for this purpose. I haven't seen one that was modified to 12-volt yet but who knows what can show up. This is what makes for the confusion.


There may be some small 12-volt batteries that have been disguised as a 6-volt.


Your radio may be polarity sensitive if it has been repaired with late type solid state components for positive ground. It would also need a voltage drop. If no radio, no problem. The ignition coil is also polarity sensitive but that can be overcome depending on what type of ignition the car has. The bulbs all have to be 12-volt and the gauges in the instrument panel need voltage reduction as well as heater motors and the like. The rest will likely function on 12-volt. Horns get pretty harsh sounding though.


The generator would have to be changed over to 12-volt field coils or an alternator could be used but would stick out like a sore thumb unless it had one of those iffy Power Gens or an alternator converted generator body. There are several ways to go 12-volt if you want to. You will have to check this stuff to see if it has already been converted or not.

Last edited by rotorwrench; 03-16-2019 at 10:06 AM.
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Old 03-17-2019, 09:45 AM   #23
Licensed to kill
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Default Re: positive to negative change

Just to satisfy my own curiosity, the battery/voltage issue notwithstanding, why do you want to switch the polarity to negative ground?. Is there some advantage over positive ground?.
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Old 03-17-2019, 11:09 AM   #24
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Default Re: positive to negative change

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Originally Posted by Licensed to kill View Post
Just to satisfy my own curiosity, the battery/voltage issue notwithstanding, why do you want to switch the polarity to negative ground?. Is there some advantage over positive ground?.
If the vehicle is original, no. If you are going to add modern devices that use negative ground, maybe. Don't really see any reason unless you were converting to 12v at the same time.
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