The idea of the resistor is to lower voltage at the points. The sticker on
your new coil indicates an internal resistor. Voltage at distributor end
should read between 6 to 7 volts. NO MORE THAN 7.5 or you will have some
unpleasant surprises not too far down the road.
Mike Aube
-----
From: Jim Lill <jpl@vectorbd.com>
To: Adrian O'sullivan <browndog@gofree.indigo.ie>
Cc: <peugeot-l@egroups.com>
Sent: Saturday, April 08, 2000 7:50 AM
Subject: Re: 504 ballast resistor ignition
> On Thu, 6 Apr 2000, Adrian O'sullivan wrote:
>
> > I am replacing a coil in a 504 which has a ballast resistor attached
> > to it. I got a standard 12v Lucas coil as I couldn't get an original
> > one. I thought maybe I could just use the ballast resistor with the
> > new coil but I am not sure because
>
> > a) my Haynes manual says 'since the coil and resistor
> > are matched they must be renewed together if faulty
> > b) on the side of my new coil there is a sticker which
> > reads 'use with contact breaker ignition without
> > ballast resistor'.
>
> > will it just not work if I try to use the new coil or could I do
> > damage to something ?
>
> The purpose of the resistor in a breaker type ignition is to limit the
> peak current through the contact points during the inrush period of the
> coil's "charging". An inductor is a little like a capacitor in that
> regard. Remember that you don't even get a spark until you open the points
> and the magnetic field of the coil "collapses".
>
> Most ballast resistors fail in the open circuit mode. So if yours has
> continuity it is OK.
>
> I can't comment on that Lucas coil sticker, lacking the Lucas P/N or
> specifics on the coil.
>
> Here's are the downsides of any combination:
>
> - use of new coil and resistor may mean a weaker spark at high RPM as the
> "charge" time of the coil will be longer.
>
> - use of the coil without the resistor could cause premature point
> failure.
>
> I have driven 100's of miles in American cars with a jumpered out failed
> resistor.
>
>
>
>
>
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>
> Recommended format for your email subject lines:
>
> Model # [Model Letters] Year Subject
>
> Examples:
>
> 505 88 V6 Mileage
>
> 405 Mi16 89 Ignition Coil source?
>
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