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Author
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Topic: Does a Mallory Unilite need a ballast resistor?
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f100cleveland
Gearhead Posts: 505
From: St. James, MN
Registered: Sep 2004
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posted 05-08-2005 07:34 PM
 
This weekend a buddy of mine installed a Comp 9000 distributor in his 400 and the truck wouldn't even start. So I tested the unilite module and it was bad, it was a constant voltage and didn't trigger. I had an extra module, so we put that in and the truck started right up. I got the timging set and the truck was running great and then it just shut off. It ran for maybe 5 minutes. Checked the module again and this time there was no signal at all coming out of it. The wiring and the module were hot. At the same time, he installed a Mallory Pro-Master coil. So, my question is, does the coil need the ballast or is there some other trick that can be done so it doesn't fry another module? I have two different vehicles that had the unilite system in them and neither of those had ballasts. Is there something that would cause it besides voltage spikes?------------------
1982 Ford F100 2wd Shortbox. Powered by a 357 Cleveland w/ closed chamber 4v's and a Funnelweb. Full Roller c-6 trans with Gear Vendors Overdrive and 4.86 geared Detroit Locker equipped 9" rear. 1982 F100 351c 4v 1977 F150 460 Burnout Truck
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Mpcoluv
Gearhead Posts: 1421
From: Charlotte NC usa
Registered: Apr 2001
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posted 05-08-2005 09:36 PM
I use the factory resistor wire in the harness for mine.
I think it does need a resistor.
Centuryperformance.com used to have a ton of mallory manuals and info on line.
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 05-08-2005 11:22 PM
No.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
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jsracingbbf
unregistered
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posted 05-09-2005 12:10 AM
I fried one last year. I found out Mallory makes a surge protector that you can buy from Jegg's that plugs in by the distrib. I bought one, just in case. 40 bucks heh.
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iskwezm
Journeyman Posts: 75
From: Rowland Heights,Ca
Registered: Apr 2005
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posted 05-09-2005 06:38 PM
I run the Unilite and a Crane coil,MSD Digital 6 with no ballast and never had a problem.
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f100cleveland
Gearhead Posts: 505
From: St. James, MN
Registered: Sep 2004
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posted 05-09-2005 06:42 PM
I found out that the module can't have anymore than 10 volts applied to it. They are fine if used with a 12 volt source if an igntion box is used. The box will cut the voltage down. Since this one was wired without an aftermarket box and was connected right to a 12v wire that isn't a factory resistance wire, it shorted out the module because of too much voltage. ------------------
1982 Ford F100 2wd Shortbox. Powered by a 357 Cleveland w/ closed chamber 4v's and a Funnelweb. Full Roller c-6 trans with Gear Vendors Overdrive and 4.86 geared Detroit Locker equipped 9" rear. 1982 F100 351c 4v 1977 F150 460 Burnout Truck
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iskwezm
Journeyman Posts: 75
From: Rowland Heights,Ca
Registered: Apr 2005
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posted 05-09-2005 10:17 PM
quote:
Originally posted by f100cleveland:
I found out that the module can't have anymore than 10 volts applied to it. They are fine if used with a 12 volt source if an igntion box is used. The box will cut the voltage down. Since this one was wired without an aftermarket box and was connected right to a 12v wire that isn't a factory resistance wire, it shorted out the module because of too much voltage.
I havent had my ignition box that long.Have I just been lucky?The Unilite is about 10 years old.
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