Re: 12 volt coil compatibility

Posted by Owen Aaland on January 05, 2009 at 14:21:12 from (65.161.86.89):

In Reply to: 12 volt coil compatibility posted by bthansen on January 04, 2009 at 07:46:42:

mkirsch said: (quoted from post at 08:39:30 01/05/09) ....... The 12V coil already has one resistor in it that cuts the voltage roughly in half. If you put 6V to the coil, it'll see 3V through the resistor. Adding an external resistor will cut the voltage by half again. Now instead of 3V, the coil will only see 1.5V, about as much as a flashlight battery.

A 6 volt system should not have any resistor in the circuit.

Other than that you have the right idea but the math will be a bit off. Adding the resistor to a 12 volt coil that has an internal resistor will only add about 50% more resistance rather than 100%. Assuming that the resistance of the external resistor, the internal resistor, and the coil windings are all equal, the voltage after the internal resistor will be four volts rather than three.

It really doesn't make much difference because either way the voltage will be too low.

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Optional Video Title: Optional Video URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.   Advanced Posting Tools   Upload Photo  Select Gallery Photo  Attach Serial # List  Return to Post

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]