Need help with Mallory Uni-Lite distributor/ProMaster Coil combo

[bobcowan]

The ballast resistor is just that, a resistor. When the gap is open in the distributor, you'll get full battery voltage. When the gap is closed you should between 7-12 volts. To test the resistor, use an ohm meter, not a volt meter. In theory, the ballast resistor is designed to be either open or closed. It works or it doesn't. Voltage passes through or it doesn't.

If you're not getting a spark, it's probably the Mallory module. They have a nasty habit of failing; and it doesn't take much. I went through about 4 of them before I finally figured out it was the main battery switch. I know it's expensive, but replace it anyway. If that's not the problem, you'll have a spare. Eventually you'll need it.

Do you have circuit protection for the distributor? If not, you should install one. It's cheap and it works.

http://www.summitracing.com/parts/maa-29351/overview/

[YerDugliness]

Originally Posted by bobcowan

If you're not getting a spark, it's probably the Mallory module. They have a nasty habit of failing; and it doesn't take much. I went through about 4 of them before I finally figured out it was the main battery switch. I know it's expensive, but replace it anyway. If that's not the problem, you'll have a spare. Eventually you'll need it.

Do you have circuit protection for the distributor? If not, you should install one. It's cheap and it works.

http://www.summitracing.com/parts/maa-29351/overview/

Bob, is the item in your attached photo the Mallory version of a ballast resistor, or is it a different item with a different function?

I have no problem with spending the $$ it will take to make the system operational and my primary goal is reliability...my area of TX has quite a few National Forest areas and the car is used frequently for jaunts in areas where there is little in the way of civilization or help, so I am motivated to make sure the repair is durable.

I am convinced the control module needs replacing. I think I will replace the ballast resistor, too, and if the item in your post is a different item with a different purpose I will install one of those, too.

I want to fix it once...have no interest in short cutting the repair process or skimping on quality.

Thanks!!!

Dugly

[bobcowan]

Originally Posted by YerDugliness

Bob, is the item in your attached photo the Mallory version of a ballast resistor, or is it a different item with a different function?

Completely different function. It protects the circuits in the distributor from spikes and surges.

From Mallory: "These Mallory Active Power Filters are designed for Unilite ignition systems that experience failures with ignition modules from voltage spikes. Voltage spikes are clamped and regulated by the Active Power Filters, keeping them from damaging the Unilite ignition modules."