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Old 09-26-2002, 05:37 PM
jmi jmi is offline
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Post No spark from coil

I have a Mallory unilight breakerless distributor and Mallory Promaster coil set up on my 355 sbc.
Ilost all power while driving the other day, no spark from coil , so I purchased another coil and still no spark. I see no lose or broken wires and the ground wire is ok. I turn on the key and put my test light to the positive side of coil and get a good bright light, I put the the test light on the negative side of coil and I get a weak light, I am no expert on electrical troubleshooting, any help will be appreciated. The engine turns over and I have electrical to headlights etc. needless to say I am clueless jmi

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Old 09-26-2002, 09:28 PM
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Red face

IT sounds like you have a bad breakerless module.
Go to the Mallory web site and go to their instruction pages. Click on the PDF link for testing the module.***Unilite Test Procedure***
It is very easy to test.
Do you have one of Mallory #700 ballast Resistors wired in to your system?? You will fry the module without it!

[ September 26, 2002: Message edited by: Redshiba ]</p>
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Old 09-27-2002, 02:15 PM
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Definately make sure if your using the ballast resistor. It might be too late for the old module(which can go out sometimes if you sneeze wrong), but im sure you dont want to buy more than 1 more of them any time soon

Also, did you pop open the distributor and see if there were any dangling wires? Just a thought..
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Old 11-04-2003, 11:55 PM
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Same problem, No spark from Coil

I went to the Mallory website and printed out the Magnetic_Brk_Test.pdf and the MA1185_MagneticBrkDist.pdf for my ProMaster Coil.

After hooking up the + lead on my digital VOM to the + terminal on the coil to I am getting 11.6 volts at first (test says supposed to be 6 volts)... then when I shorted between the pickup
and reluctor blade little happened. it fluctuated witch I suppose is good.

"The voltage should go up to 12
volts momentarily and then go back down to battery voltage. If it
does then the module is good."

Nowhere does it say if the voltage is too high (or is it?)

"(3) If the test results are as follows:
(a) Voltage does not go up, module is bad and must be replaced.
May have been caused by power surge, high resistance in
the plugs or plug wires, or improper ground. Possible charging
system load dump.
(b) Voltage always stays below 6 volts. Module has been spiked
by high voltage or amperage, lack of ballast resistor, or improperly
wired up."

I'm not looking forward to shelling out the $68 for the Part No. 609... Any Ideas?

and yes, I am using a ballast resistor (Figure 2 in the MA1185_MagneticBrkDist.pdf)

ANY advice would be greatly appriciated.
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Old 11-13-2003, 02:37 AM
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Bad 609 module

I broke down and ordered the 609 along with a new ballast resistor (never can be too careful). Doug Herbert had it cheep, but I never got it. So I finally got it from a local Car Quest.
He was unable to beat the price on the net, but beat Kragen, and had it for me the next day. $134.49 later my car was running.

You are speaking of the MAL - 605 but the end results are the same.

Ballast resistor MAL -700 is mandatory.
There is a year warranty on both 609 and 605.
and last but not least....
If your car stalls for no apparent reason. moving and at idle, or just wont start like it normally does... chances are the module is bad.

Mallory has excellent tech support. I left a short message and got a reply from there staff the same day with the end result of a bad 609 module.
Good luck to all
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