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Re: Ballast Resistor Yes or No?
[Re: Mattax]
#1717584
01/03/15 02:58 PM
01/03/15 02:58 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Yea the MSD type ign which is the multi-spark up to a certain rpm normally has both coil pos and neg hooked to the MSD control box as it controls the coil primary and can induce like 300 volts into the coil primary and most MSD type ign are designed not to use a ballast as they control the coil primary with their control box. Ron
Last edited by 383man; 01/03/15 02:58 PM.
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Re: Ballast Resistor Yes or No?
[Re: cjskotni]
#1717585
01/03/15 03:02 PM
01/03/15 03:02 PM
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Joined: Feb 2009
Posts: 892
Illinois
StrkrDart69
super stock
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super stock
Joined: Feb 2009
Posts: 892
Illinois
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Quote:
Yes, you should run a ballast with the OEM coil as well as most aftermarket coils. If you don't run it, the life of the coil will be greatly reduced as it will run much hotter and with nothing to limit current going to it.
FWIW, I tried to run my MSD Blaster II coil (Mopar chrome box ECU) with no ballast and it was searing hot after 5 minutes. I went to a .25 ohm ballast which dropped the voltage to the coil to 7-8V which kept it much cooler and with no discernable drop in output to the plugs (40-45kV).
Use the ballast. 
You have other issues. Ecu should not be getting hot. Also my coil does not run hot.
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Re: Ballast Resistor Yes or No?
[Re: goldduster318]
#1717589
01/03/15 07:12 PM
01/03/15 07:12 PM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,439
So Cal
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Quote:
Its protecting only the coil. If you check the wiring diagram, the ECU gets full battery voltage from the vehicle harness.
Depends upon the year...
Certain Mopars used a dual element ballast resistor, this connected to pin 5 of the ECU, protecting it. For early ECU systems, the Mopar engineers were concerned about max voltage to the ECU as to protect its power transistor..
Just my $0.02... 
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Re: Ballast Resistor Yes or No?
[Re: Supercuda]
#1717591
01/03/15 09:33 PM
01/03/15 09:33 PM
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Joined: Feb 2009
Posts: 892
Illinois
StrkrDart69
super stock
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super stock
Joined: Feb 2009
Posts: 892
Illinois
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Quote:
Quote:
Go ahead and keep using a ballast resistor. 
You wouldn't happen to be an electrician now would you?
No I am a yawner.
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Re: Ballast Resistor Yes or No?
[Re: StrkrDart69]
#1717593
01/05/15 09:47 AM
01/05/15 09:47 AM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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Quote:
Quote:
Yes, you should run a ballast with the OEM coil as well as most aftermarket coils. If you don't run it, the life of the coil will be greatly reduced as it will run much hotter and with nothing to limit current going to it.
FWIW, I tried to run my MSD Blaster II coil (Mopar chrome box ECU) with no ballast and it was searing hot after 5 minutes. I went to a .25 ohm ballast which dropped the voltage to the coil to 7-8V which kept it much cooler and with no discernable drop in output to the plugs (40-45kV).
Use the ballast.
You have other issues. Ecu should not be getting hot. Also my coil does not run hot.
My coil was running hot, not the ECU.
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