View Single Post
Old 08-20-2013, 02:27 PM   #7
Jim/GA
Senior Member
 
Jim/GA's Avatar
 
Join Date: May 2010
Location: Young Harris, GA
Posts: 1,808
Default Re: 12v to 6v drop down resistors

Quote:
Originally Posted by Purdy Swoft View Post
I haven't tried it, but i've heard of using an old ignition coil, mounted and hidden inside the frame rail.
Sure. Old 6 volt ignition coils and 12 volt coils that require external resistors are about 1.5 ohms.

Ceramic ballast resistors are about 1.5 ohms.

Either should work about the same, if what you need is 1.5 ohms. Hook one up and measure the voltage you get when you have the thing running that is connected to it (horn, wiper, etc.).

It is somewhat counter-intuitive, but the less current draw the device has (horn, wiper, etc.) the larger the resistor needs to be to get you the final 6 volts that you want when that thing is running.
__________________
Jim Cannon
Former MAFCA Technical Director
"Have a Model A day!"
Jim/GA is offline   Reply With Quote