"What coil ?"

[MandM]

Hi guys, think i have the wrong coil but what do you think?, and should i get 6V on the positive side of the coil and 12v when it,s cranked over.

I know i should know, but just checking as my coil has 12v on the side of it and is a delco one ?, don't want to buy the wrong one. engine no LF307??HEA.


I Thankyou for your answers.


005.jpg006.jpg

[73stagman]

Put a meter across the positive and negative terminals of your coil with the car wiring disconnected completely with your meter set to read "ohms" then post the reading. The measured resistance will tell you if your coil needs a ballast resistor or not. Your ignition system well then determine if you have the wrong coil or not.

[73stagman]

Found this.. it might help

HOW TO TEST IT:

For preliminary test, use an ohm meter to check the resistance of the windings of the coil. For a non-ballasted ignition system coil primary resistance should be about 3.2 ohms. A high energy coil may have slightly lower primary resistance. A coil for use with a ballasted type ignition system will have about half as much primary resistance, around 1.6 ohms.

[KansasCityMilkman]

There much better contraception methods out there these days Martin!

[MandM]

Found this.. it might help

HOW TO TEST IT:

For preliminary test, use an ohm meter to check the resistance of the windings of the coil. For a non-ballasted ignition system coil primary resistance should be about 3.2 ohms. A high energy coil may have slightly lower primary resistance. A coil for use with a ballasted type ignition system will have about half as much primary resistance, around 1.6 ohms.

Like this ?
007.jpg P.S M tried it once and didn't like it (Kansas) "to much of a shock"

[Motorcycle mad]

Hi
According to my Lucas cross reference books your AC Delco ignition coil, part number 7992190 is inter-changeable with Lucas part number DLB102.
Lucas recommends the DLB102 for the Triumph Stag from 1970–77.

The DLB102 coil is designed to operate in conjunction with a ballast resistor which on the Mk1 Stag is a ceramic block type resistor mounted under the bonnet, while on the Mk2 Stag’s the resistor is in the form a length of resistive wire built into the wiring harness, and therefore cannot be seen.

Regrettable I cannot quote resistive values of the primary, or secondary windings of the coils for you to do any comparison, but I cannot see any reason for your coil not being suitable. Reading Neil's reply has jogged my memory that seems correct.

I think AC Delco marked their coils 12V because it was being used on a 12volt circuit, and it was then up to the person fitting it, to ensure it was correctly wired up, I know, a bit confusing. On the other hand, I don’t think Lucas actually marked the voltage on their coils, although on the bottom of their coils was some coded info which enabled a trained fitter to identify the type coil.

Ken

[Goldstar]

According to the ROM 1.43 to 1.58 ohms if that helps

[MandM]

This is why the Forum is member of the year, thanks Guys

[73stagman]

Thats fine if you have points ignition.
Some electronic systems will want a non ballasted coil and then a higher resistance coil will be required

[MandM]

Thats fine if you have points ignition.
Some electronic systems will want a non ballasted coil and then a higher resistance coil will be required

I have a lumenition system, so is this coil ok?

[Goldstar]

I have a lumenition system, so is this coil ok?

According to my Lumenition instructions the coil must have a resistance of not less than 3 ohms so Neil is absolutely correct and your 1.6 isn't right.

This is the actual quote
• SUITABLE FOR coils or coil/ballast combinations of not less than 3 ohms.
• NOT SUITABLE FOR use with low resistance (i.e. less than 1ohm) electronic ignition coils

[73stagman]

You need to check you lumenition instrctions but I believe that you need a system with a minimum of not less than 3 ohms (including the ballast resistor)for the Lumenition.

Do you have a ballast resistor wire or a ballast resistor block?

[73stagman]

According to my Lumenition instructions the coil must have a resistance of not less than 3 ohms so Neil is absolutely correct and your 1.6 isn't right.

This is the actual quote
• SUITABLE FOR coils or coil/ballast combinations of not less than 3 ohms.
• NOT SUITABLE FOR use with low resistance (i.e. less than 1ohm) electronic ignition coils

almost but it is the coil plus ballast resistor impedence that must be not less than 3 hms. So you can run a non ballasted coil (higher resistance coil 3 ohms or more)) with no ballast resistor wire or block or a low impedence coil (lower resistance like the one you have ) with a ballast resistor wire or block as long as you have a total resistance of not less than 3 ohms

[Goldstar]

MK1 Ballast resistor is quoted at 1.3 to 1.4 ohms in the good old book - no idea about Mk2 wire - so it's touch and go

[Motorcycle mad]

MK1 Ballast resistor is quoted at 1.3 to 1.4 ohms in the good old book - no idea about Mk2 wire - so it's touch and go

The same coil is used on both systems (Mk1 and Mk2), so resistance should be the same?