Coil differences

[6meter]

I would like to clear up either for me or everybody else. Generally talking about a Chevy motor here. With a points system dizzy, you have a external resistor coil with a resistor block or a resistor wire that cuts the running voltage down to 7-9v. Or you have a internal resistor coil that cuts the voltage inside the coil. Is there then a constant 12v feed to it? The 3rd option is TB IV or V. Does that coil have a constant 12v feed with no resistors? All 3 have different part numbers.

 

[6meter]

Re: Coil differences

Did I ask a stupid question or is it that nobody knows?

 

[Lyle29464]

Re: Coil differences

I thought I knew how they worked till I read your question.

ok I will do the old stile. If you run a external resistor you run a normal 12 volt wire to it. If you run a regular coil with out a resistor you will need the resistor wire while running and 12 volts to start. If you run a resistor coil it uses 12 volts.

 

[zbnutcase]

Re: Coil differences

I would like to clear up either for me or everybody else. Generally talking about a Chevy motor here. With a points system dizzy, you have a external resistor coil with a resistor block or a resistor wire that cuts the running voltage down to 7-9v. Or you have a internal resistor coil that cuts the voltage inside the coil. Is there then a constant 12v feed to it? The 3rd option is TB IV or V. Does that coil have a constant 12v feed with no resistors? All 3 have different part numbers.

An internal resistor coil does have straight 12V going to it, as does Merc TB IV systems.

 

[Fed]

Re: Coil differences

Never stop learning in this place.
A question, does an internal resistor coil have a second + terminal that's taken from the junction of the internal resistor & the primary coil?

 

[6meter]

Re: Coil differences

ok I will do the old stile. If you run a external resistor you run a normal 12 volt wire to it. If you run a regular coil with out a resistor you will need the resistor wire while running and 12 volts to start. If you run a resistor coil it uses 12 volts.[/QUOTE]

I think you mean internal here.

 

[Lyle29464]

Re: Coil differences

Many engines had 2 wires to the coil.

1 A resistor wire to feed a normal coil for operating.

2 A regular wire from the starter slave to give it 12 volts when starting.

If you changed the coil to a internal resistor type or you have an external resistor you need to change the resistor wire to a normal wire.

 

[Aloysius]

Re: Coil differences

The only time you'd need an external resistor/ballast is with points. Period. Everything else is full 12 volts with INTERNAL resisted coil, or "stock" coil with factory solid state ignitions.

 

[Lyle29464]

Re: Coil differences

The only time you'd need an external resistor/ballast is with points. Period. Everything else is full 12 volts with INTERNAL resisted coil, or "stock" coil with factory solid state ignitions.

Check 2 nd line in his original poat.