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  #16 (permalink)  
Old 11-24-2012, 02:22 PM
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When you replace a points type ignition that has 9.5V ballast wire and a 12V start wire , you must install a ballast resistor in the 12V start wire in order to drop the voltage from 12V to 9.5V when cranking. If you don't install a resistor in the start wire, after a few starts, you will burn out the Unilite infra red bulb. That happened to me once and I do not recall the instructions saying anything about it because Mallory knew they would not sell any of those systems if they mentioned installing a resistor.

I asked myself ... "Why install a high performance ignition system that runs the coil on 9.5V like it was originally?". I tossed the Mallory Infra Red Unilite ignition system and installed a Pertronix magnetic ignition system which starts the engine and runs on 12V without any light bulbs to get dirty or burn out.

One reason the Pertronix ignition systems were not so popular at that time was because they are not "drop in" systems. The distributor should be optimized to use the Pertronix system. Meaning, the thrust and the wobble must be taken out of the distributor shaft and weight plate. That is easy to do with shims and eyeball the wobble as you spin the distributor while you take out the wobble with a small lightweight hammer.

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  #17 (permalink)  
Old 11-24-2012, 07:52 PM
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Oingo boingo, i figured that the 12v hook up might have done er in, so thanks just wanted to make sure b4 i spend $90 on a new one.
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Old 11-25-2012, 04:59 AM
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the Accel module #2005 will interchange on the Unilite distributor.
it is also about half the price of the Unilite version.
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Old 11-26-2012, 09:28 PM
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Voltage v Current

According to Mallory the resistor cuts back current flow not voltage.
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Old 11-27-2012, 07:13 AM
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To successfully use a Mallory Unilite IR distributor or kit, a Mallory #700 1.5 ohm ballast resistor is required in the start and run wires in order to drop the voltage from 12V to 6V at the coil primary (+) .
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  #21 (permalink)  
Old 11-27-2012, 11:08 AM
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Quote:
Originally Posted by ABTS View Post
According to Mallory the resistor cuts back current flow not voltage.
Mallory is wrong. A Ballast resistor cuts back the voltage to the coil and therefore current. It simple ohm's law. I = E / R
R= Resistance
E = volts
I = current (Amps)
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Old 12-06-2012, 08:16 PM
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Mallory Problem

I can confirm first hand a battery charger killed the module in mine. Was working on the car and forgot to unplug it. I just switched to an Accel HEI and forgot about it.
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