Re: Part needed, Ballast Resistor? no, radio noise suppressor

[farna@xxxxxxx]

Kim, that's a radio noise suppression condensor, not a ballast resistor. The ballast resistor will look like the one you mentioned on the coil. Your car should have the BID electronic ignition system unless it's been changed to points or a later model Ford or HEI electronic ignition or an aftermarket Pertronix Ignitor. The BID system has what looks like a double vacuum canister on the side od the distributor, but only one of the canisters has a vacuum line on it. That was original equipment in 1975. If you get the coil with the big ballast resistor on the side DO NOT connect the ballast resistor. It sounds like you're describing what's sold as a universal fit coil for older cars. They include the resistor because some pre 67 cars used a coil with a built in resistance, some an external ballast resistor. That coil will work fine with either, just take the original ballast resistor (or the one on the coil) out of the circuit. It's not a direct drop in. 67 and later AMCs (and m!
 ost others) use a resistance wire buried in the wiring harness. You wouldn't hook up the resistor for those either. With two resistors or if you have a resistor where one isn't needed, voltage to the ignition system is cut in half. The engine will run rough after the resistor gets hot. It passes a full 12V cold, but reduces voltage to 6V as it warms up. 


On August 18, 2005 mail@xxxxxxxxxxxx wrote:

> Just for reference, I have a ballast resistor on my '75 Gremlin X - at least according to Jerry's description of one it
> is. It is white ceramic with a copper fastener at each end and is connected to my coil. The "resistor" is fastened to
> the passenger side of the engine compartment beside what I believe to be my starter relay.
> 
> I have been looking to change my coil and ebay sells them with the ballast resistor attached to the coil.
> 
> Please feel free to correct me if this information doesn't seem correct.
> 
> Regards,
> Kim Bueler
> '75 Gremlin X 360 V8
> 
> 
> 
> > You're dead on Jerry, he's talking about a radio noise suppression condensor (most likely), but you WILL find those
> > ballast resistors in older AMCs (Ramblers) and some newer ones. 1965 and earlier AMC/Rambler V-8s used a ballast
> > resistor, sixes used a coil with built-in resistor. Resistance wires were used from 1967 on.
> >
> > Jeep used them at least in the late 80s on 4.0L engines, though not in that location or for the ignition. They use one
> > to cut voltage to the fuel pump when running at low speeds. It's the same 1.8 ohm resistor though.
> >
> > On August 17, 2005 Jerry Casper wrote:
> >
> > > --- R L <super70ty@xxxxxxxxxxx> wrote:
> > >
> > > > Hey all,
> > > > I am trying to get my 1977 Hornet Sportabout running
> > > > and while playing with
> > > > it, we noticed that the ballast resistor(?) had the
> > > > wire break off of it.
> > > > This is the cycilnder shaped part the bolts to the
> > > > ignition coil and
> > > > connects to the wiring harness. Is that the correct
> > > > term ballast resistor? I
> > > > am having a hardtime finding the part locally.
> > > > Anyone know where I can find
> > > > one?
> > > > Thanks
> > > > Ryan
> > >
> > >
> > >  Ryan, AMC didn't use normal ballast resistors,they
> > > used resistance wire - what you are descibing sounds
> > > like the radio noise suppressor capacitor put on coils
> > > to keep the ignition ticking out of the radio. Is it
> > > silver metal, with a braided wire coming out of it?
> > > Then it's a condenser, like in your points, NOT a
> > > ballast resistor - those are white ceramic, usually
> > > squarish, and get HOT. You'll never find an AMC
> > > ballast resistor like that <grin!>
> > >
> > > Jerry in Virginia
> > >
> > >
> > >
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> >
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