[Fot] Coil Resistance

[William Dewar]

Scott,
 The power to the ignitor module red wire needs 12v. Not 12v fed thru a
ballast which is no longer 12v. Run power from ign switch direct to
coil(3ohm) or, run power
from ign switch to ballast. From that same ballast terminal
run power to module red wire. Run wire from other ballast terminal to ign
coil (1.5ohm). Provided the ballast is also 1.5 ohm giving you 3ohm total
resistance.
 Too low total coil circuit resistance overloads the ignitor
module and shortens its life. Too high coil circuit resistance,say a 3ohm
coil with a 1.5 ballast lowers the available current and can cause
misfiring. Not all ignition systems are the same..you need to match the
total circuit
resistance to it's needs. I believe even different model ignitors could get
away with lower or higher total coil
circuit resistance. It should say in the instruction sheet.

Hope this helps,

Bill DeWar
NJTA
----- Original Message -----
From: "Barr, Scott" <sbarr at McCarty-Law.com>
To: "Randall" <tr3driver at ca.rr.com>; "triumph fot" <fot at autox.team.net>
Sent: Friday, April 15, 2011 5:14 PM
Subject: Re: [Fot] Coil Resistance


> << Note that the red wire to the module needs to get full 12v, it can't
> be to the coil if you are using a ballast between there and the
> switch.>>
>
> Sorry - between *where* and the switch?
>
> Scott
>
> -----Original Message-----
> From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
> Behalf Of Randall
> Sent: Friday, April 15, 2011 3:44 PM
> To: 'triumph fot'
> Subject: Re: [Fot] Coil Resistance
>
> > Pertronix likes 3 ohm.
> > It doesn't care if you run a 1,5 ohm coil with a 1,5 ohm resistor or
> > just a 3 ohm coil.
> > Only 3 ohm.
>
> I agree.  Total has to be (approximately) 3 ohms, doesn't matter if it's
> a 3
> ohm coil, or a 1.5 ohm coil plus a ballast resistor.
> Other combinations may appear to work at first, but risk burning out the
> module (1.5 ohm with no ballast), or producing high speed misfire (3 ohm
> plus a ballast).
>
> Note that the red wire to the module needs to get full 12v, it can't be
> to
> the coil if you are using a ballast between there and the switch.
>
> -- Randall
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