Overdrive relay question

[engine103]

1953 Mercury 6 volt +. I'm replacing all the old cloth wiring for the overdrive and while I'm at it I'm thinking of replacing the relay. I have the smaller relay that is on the firewall but also have a larger one that I've had for many years and can't remember if the larger one is 6 or 12 Volts. Does it make a difference if it is 12 volts? Can I use it in my 6 volt system? Thanks, Jim

relay 1.jpg

relay 2.jpg

[petehoovie]

Originally Posted by engine103

1953 Mercury 6 volt +. I'm replacing all the old cloth wiring for the overdrive and while I'm at it I'm thinking of replacing the relay. I have the smaller relay that is on the firewall but also have a larger one that I've had for many years and can't remember if the larger one is 6 or 12 Volts. Does it make a difference if it is 12 volts? Can I use it in my 6 volt system? Thanks, Jim

[pistonbroke]

That larger relay is identicle to all of the six volts I have used in the past. I don't know if they care about voltage though.

[JayChicago]

Voltage does matter for a relay, cuz 6 volts can push only half as many amps through the relay's coil as 12 volts.

But based on what Pistonbroke said, seems like that relay you have will work for you.

[engine103]

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Appreciate the replies! Thanks, Jim