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Author Topic: What is a Ballast Resistor?  (Read 1774 times)
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Senior Member
Posts: 198

Looking a lot better

« on: 20 June, 2010, 08:41:42 PM »


Want to buy a new coil for my 1968 1298cc Fulvia Sport Zagato, just need some advice.

What is a Ballast Resistor? is it the thing straped to the side of the coil?

This is a picture of my coil at the moment, is it fitted with the resister? and is it 1.6 Ohms?

Sorry to be stupid, I just donít know much about the ignition.



Series 1, 1.3 Fulvia Zagato 1969
« Reply #1 on: 21 June, 2010, 09:12:01 AM »

Ballast resistor reduces current to the coil.
You use a 9 volt coil with a resistor or 12 volt without.
Most accessory shops will keep them.

Original idea was that on starting a feed from the starter would bypass the
resistor and send 12 volts to the coil to give an extra boost, once started
the coil would then be fed 9 volts via the resistor. On a lot of Lancias they
didn't bother with the boost circuit and simply ran 9 volt coils with the resistor.

Bit pointless really, it's possible that's what was available at the time.

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