Volts to Coil with a Mopar Electronic Ignition
#946559
03/08/11 09:04 PM
03/08/11 09:04 PM
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Joined: Feb 2005
Posts: 2,709 NJ central
Scamp408
OP
master
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OP
master
Joined: Feb 2005
Posts: 2,709
NJ central
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What are we looking for as a # with a orange box and the supplied ballast key on no run? How much of a difference if we use the coil neg as per grounding the meter to motor?
Last edited by scamp408; 03/08/11 09:07 PM.
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Re: Volts to Coil with a Mopar Electronic Ignition
[Re: Scamp408]
#946560
03/08/11 11:27 PM
03/08/11 11:27 PM
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Joined: Oct 2010
Posts: 606 Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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The ballast/ coil combo in original stock form is pretty much the same on an ECU or points. What this means is that the coil half of the ballast works the same, and ..........not running.........
You have battery supply coming in from the ign switch, through the bulkhead, to the resistor (blue) to the coil + and through the coil to ground.
The coil is going to be drawing current with points closed OR ECU, so you have a HUGE VOLTAGE DROP through the resistor. This voltage drop is going to DEPEND ON
the condition of the wiring harness from the battery, through the bulkhead, ammeter, ignition switch (and connector) back OUT the bulkhead, and to the resistor and the connector there.
I have not checked this lately, but in "no run" I might expect as low as 4-5 volts, 9-12 in run, depending on RPM with system running at 14V.
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Re: Volts to Coil with a Mopar Electronic Ignition
[Re: Scamp408]
#946562
03/09/11 08:25 AM
03/09/11 08:25 AM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
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master
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Indiana
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""put 2 resistors in line""
When you put two ballast resistors in line, this equates to more voltage to the coil. I ran two MP 1/4ohm ballasts for two years with a FBO coil, and the coil voltage went up two volts. The FBO coil is a good one and the two ballasts did not hurt it. That coil was designed for 11.5 volts. I would not attempt this on a stock type coil.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Volts to Coil with a Mopar Electronic Ignition
[Re: TooMany62s]
#946565
03/09/11 01:03 PM
03/09/11 01:03 PM
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Joined: Feb 2005
Posts: 2,709 NJ central
Scamp408
OP
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OP
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Joined: Feb 2005
Posts: 2,709
NJ central
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12 volt into the first one and 8 coming out, 8 going into the sec than 5 coming out.That is with meter grounded to engine. Does he need the sec resistor?
Last edited by scamp408; 03/09/11 01:04 PM.
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Re: Volts to Coil with a Mopar Electronic Ignition
[Re: YO7_A66]
#946566
03/09/11 03:48 PM
03/09/11 03:48 PM
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Joined: Oct 2010
Posts: 606 Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
""put 2 resistors in line""
When you put two ballast resistors in line, this equates to more voltage to the coil. I ran two MP 1/4ohm ballasts for two years with a FBO coil, and the coil voltage went up two volts. The FBO coil is a good one and the two ballasts did not hurt it. That coil was designed for 11.5 volts. I would not attempt this on a stock type coil.
NEGATIVE. You must have put two resistors IN PARALLEL to do that. Two resistors "inline" (in series) results in MORE voltage DROP and LESS voltage to the LOAD
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Re: Volts to Coil with a Mopar Electronic Ignition
[Re: Yancy Derringer]
#946568
03/09/11 04:08 PM
03/09/11 04:08 PM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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Yancy,
""You must have put two resistors IN PARALLEL to do that.""
Correct, They were wired in parallel.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Volts to Coil with a Mopar Electronic Ignition
[Re: Scamp408]
#946572
03/09/11 11:58 PM
03/09/11 11:58 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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How about this, we're sidetracked. Take the leads off of the coil and the ballast & ohm them (1) ballast (2)coil pri to pri (3)coil, either pri to center secondary on X 1000 (K) scale & post what you get. The nominal (listed) spec on the ballast supplied w the orange box kit is 1.25 ohms though there is some wiggle room there (less ohms=hotter spark shorter coil life & vice versa). lets see if we can ID what you have & almost forgot you have 2 ballasts so ohm each one & connect em in parallel and ohm the T'd ends again.
live every 24 hour block of time like it's your last day on earth
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Re: Volts to Coil with a Mopar Electronic Ignition
[Re: RapidRobert]
#946573
03/10/11 12:33 AM
03/10/11 12:33 AM
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Joined: Oct 2010
Posts: 606 Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
How about this, we're sidetracked.
I'll say, look, you just don't get it. You are measuring something that is not legitimate. There is no published spec anywhere that relates to a CONDUCTING coil with the engine off. Moreover, it depends on what I mentioned earlier---the entire voltage drop across the harness, starting with the battery, ---through the bulkhead (twice) through the ign switch and it's connector, etc etc etc.
What you want to do is either determine WHAT your coil "is" or buy one that you think will perform (aftermarket) and then follow the manufacturer's destructions as to what resistor to use.
The other thing that you cannot do anything about, is the incredibly poor quality of some of the late ECU boxes we keep hearing about. It just might be that due to poor QC in the internal circuitry, you don't get the full output of the coil that you should
ONE BIG FACTOR in that equation is the "CONDENSER." (Capacitor) Just exactly like a points system, an Mopar ECU has a condenser (cap) inside the box. IF THIS CAP is poor quality, or over or under capacity according to the coil, you won't get the spark that you'd expect.
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