What it takes to convert 6V OD to 12V

[Uncle-Pekka]

I was contacted by a fellow here in Finland, who has a newly imported 1948 P15 business coupe. The previous owner(s) have mounted a R10 OD in the car, but later converted the electric system from 6V to 12V, thus OD is not functional any more.

My guess is that he needs 12V solenoid and probably also new relay.

Is there something more to it?

Is the OD system sensitive to polarity?

I presume the polarity has been changed to - gnd.

[greg g]

Shouldn't be polarity sensitive, the solenoid could be bench tested for this. If they are then the terminals could probably be reversed to accomodat that. Also the 6V solenoid should be stout enough to work on 12 V (at least until a replacement could be located and mounted. Both the relay and the solenoid are basically electromagnetically operated switches. Neither have a lot of resistance.

[1941Rick]

Greg is right, the sol will run easily on 12 volt. mine has for years now. I would change the relay to a Bosch style. There are 2 wires on the sol. Make sure they are hooked up right. One goes to power from the relay and the other is a momentary ground that hooks to the distributor.

The sol comes apart easy for cleaning.

Good luck

[BobT-47P15]

OK......then conversely.......I guess a 12V solenoid would NOT work on

6 volts.

How can you tell whether your trans came from a 12V or 6V car

originally? My engine is from a 1957 Plymouth, which was 12V, but I

don't know if the OD came from the same car, or an older one. My

system is still 6V.

[DJ194950]

OK......then conversely.......I guess a 12V solenoid would NOT work on

6 volts.

How can you tell whether your trans came from a 12V or 6V car

originally? My engine is from a 1957 Plymouth, which was 12V, but I

don't know if the OD came from the same car, or an older one. My

system is still 6V.

I would certainly like to know myself after rebuilting several r-10 trans and using one in my 50 4 dr. Mine was changed to 12v. at starting my rebuild( no engine, etc.)

It did not work with the 6v. solenoid on trans. Checked solenoid off trans, seemed to work ok. Installed 12v. solenoid bought on epay for about $60 and worked good. Do not know why? Everyone else her has said it works ok!

Buying on epay look for a solenoid advertised from a '56 or later! + 12V.!

Regardless of make. Most fit and work, just make sure of the throwout measurement, engaged/disengaged. A FEW are longer stroke, ask questions!

Just asking, did anyone leave here done 12v. conversions 12v.pos. ground ??, Or heard of such?? Crazy question I know!! Could be done! Why, i don't know, just askin!!!

[james curl]

I have had several older English cars that were 12 volt positive ground.