Resistor for a coil

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Model T Ford Forum: Forum 2015: Resistor for a coil
Top of pagePrevious messageNext messageBottom of page Link to this message  By Ronnie wehba on Wednesday, May 06, 2015 - 07:46 pm:

Until I can get a coil box and timer setup and junk the dizzy,,do I need a resistor between the coil and hot wire ,if so is there a "size" I need thanks, trying to get it running by show Saturday


Top of pagePrevious messageNext messageBottom of page Link to this message  By Donald Conklin on Wednesday, May 06, 2015 - 09:12 pm:

No resistor required. The car will run better on 12V than on 6V. Mag. voltage will exceed 12volts in normal operation.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Wednesday, May 06, 2015 - 09:22 pm:

HE IS RUNNING A DISTRIBUTOR.
What coil do you have, what voltage are your running?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ronnie wehba on Wednesday, May 06, 2015 - 09:28 pm:

6volt vw coil


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dave Wells, Hamilton Ontario on Wednesday, May 06, 2015 - 09:42 pm:

Good to here someone switching back to the original system.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Georgetown TX on Wednesday, May 06, 2015 - 09:48 pm:

Ronnie you don't need a resistor if it is a real Bosch 6V VW coil.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Erik Barrett in Auburn Ca. on Wednesday, May 06, 2015 - 09:49 pm:

Assuming your battery is also 6 volt, you don't need a resistor as long as your generator is not overcharging. What kind of distributor are you taking off and what year coil box do you need? I have a couple of real nice 26-27 boxes and coils ready to install and go.
Erik


Top of pagePrevious messageNext messageBottom of page Link to this message  By JohnH on Wednesday, May 06, 2015 - 09:56 pm:

No resistor is required for a 6V distributor type coil, presuming of course it's being run from a 6V battery.
Some 12V coils do require a resistor. This resistor is usually shorted out during starting to provide a hotter spark.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Aaron Griffey, Hayward Ca. on Thursday, May 07, 2015 - 01:54 am:

Not so Keemosabby.
Some 6 volt coils need an external resistor, like Ford V8 cars from '32 through '48.
Model a Fords had the resistor built into the coil like the 6 volt VW.
A 6 volt coil with no resistor will burn the points out in less than a days running.
A Ford V8 with a dual point distributor will last longer.
A 12 volt car with a 12 volt coil and no resistor will fry the points in about 10 minutes or so.
You need not buy a Bo$ch coil, any brand '66 VW coil will do.
Usually less time than that.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ronnie wehba on Thursday, May 07, 2015 - 07:29 am:

Eric it is a texas t unit


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ronnie wehba on Thursday, May 07, 2015 - 07:31 am:

A 25 TT


Top of pagePrevious messageNext messageBottom of page Link to this message  By Charlie B actually in Toms River N.J. on Thursday, May 07, 2015 - 01:11 pm:

First up you need a resistor. Second up: look closely at your coil. It may be marked "internal resistor" in which case you don't need one because it's already there. If it's not marked it doesn't have an internal resistor. I don't believe they come in differing types for different voltages. A Chrysler ignition resistor from the 1960's will do just fine. About $5. Most vehicles used a by-pass in the ignition switch that sent 12 (or 6) volts to the coil on cranking/start-up then went through the resistor when the key was released for running.


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