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Unread 02-27-2014, 12:43 PM   #1
lemmons1
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1984 CJ7 
 
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Location: Kingwood, TX
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Ignition module with Painless wiring install.

Hello!

This is my 1st post to the jeepforum.com, and I have been reading these threads for the last 4 months since I bought my CJ-7. So thank you in advance, many have helped me get through some questions.

I am at the point of wiring my ignition in my '84 CJ-7, and I have come across something I am confused about. Every forum, thread, etc that I have read mentions using the purple/ violet wire coming out of the ignition module and twisting it to the orange wire, which they both go to the distributor. I pulled the entire old wiring harness and emissions ECM out and have it for reference if needed. I cut the wires going from the distributor to the ECM with plans on running them to the ignition module. I have upgraded to a TFI coil and already have in place the adapter, cap and rotor for the Team Rush upgrade.

This is my question/concern. There is a 4 wire connector coming from the ignition module that has the orange, purple, green and black wires. My OEM wiring harness with the 4 wire female connection only has 3 wires coming from it. - The purple wire does not come out of that connection. It ran before I did the wiring harness swap, so what wires do I use at this point? Do I buy another 4 pin connector and run the purple/orange wires to the dist or what? Please note, there is not even a terminal in the OEM connector for the purple male connector to plug in to.

Any and all help/ advice/ wisdom and knowledge is GREATLY APPRECIATED.

Thank you.

module-connections.jpeg  

Last edited by lemmons1; 02-27-2014 at 12:47 PM.. Reason: Added the picture.
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Unread 02-27-2014, 12:52 PM   #2
John Strenk
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You have to extend the purple wire to the ICM.
Remember to twist the orange and purple wire around each other to cancel noise pickup.


This is what you had


The distributor pickup signal ran to the computer and was processed there. All the computer sent out was the modified pulse to the ICM. That was all it needed to fire the coil.

You need to add some wires now directly to the ECM like this:


I grabbed an old harness from an earlier jeep to make the change.
You can probably find a 4 wire connector on any old Ford truck that uses the DuraSpark system. I'm not sure if you can just buy the plug or not.

AutoZone is mighty proud of their harness for this:
http://www.autozone.com/autozone/acc...er=841834_0_0_

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Unread 02-27-2014, 01:11 PM   #3
lemmons1
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GREAT! Thank you sir. I can buy the 4 pin connector from O'Reilly; Dorman makes one. I do have another question though. Do I need to install the ancient ballast resistor shown in the wiring kit pictured in your reply? I have the old harness like I mentioned and I have read where there is a tracer wire (mine was red with green tracer) that could have been a resistance type of wire. There is not much resistance in it though, only 1.5 ohms. Is there an alternative to the ballast resistor or do I need to install it at all?

Thank you again!
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Unread 02-27-2014, 01:23 PM   #4
Mike Romain
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You need the ballast wire in for lowered voltage when in run.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 02-27-2014, 01:53 PM   #5
lemmons1
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Quote:
Originally Posted by Mike Romain View Post
You need the ballast wire in for lowered voltage when in run.
My original wiring harness did not have that installed on it, so I was wondering. Thank you, I appreciate it.
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Unread 02-27-2014, 06:34 PM   #6
John Strenk
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Quote:
Originally Posted by lemmons1
GREAT! Thank you sir. I can buy the 4 pin connector from O'Reilly; Dorman makes one. I do have another question though. Do I need to install the ancient ballast resistor shown in the wiring kit pictured in your reply? I have the old harness like I mentioned and I have read where there is a tracer wire (mine was red with green tracer) that could have been a resistance type of wire. There is not much resistance in it though, only 1.5 ohms. Is there an alternative to the ballast resistor or do I need to install it at all? Thank you again!
1.5 ohms is all you need. The wire running from the firewall to the ignition coil is the resistance wire that would take the place of the ballast resistor.

You don't need an additional ballast resistor. Sent from my iPhone using JeepForum

Your original wiring harness should have this resistance wire already in place.
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Unread 02-28-2014, 04:50 AM   #7
Mike Romain
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Quote:
Originally Posted by lemmons1 View Post

My original wiring harness did not have that installed on it, so I was wondering. Thank you, I appreciate it.
The original harness has a fat red/orange wire coming from the firewall area at a crimp connector that feeds the power in run. This is the ballast wire and this is one of the 'custom ignition' parts that doesn't come with the painless harness. My centech harness came with a ceramic ballast resistor to replace this.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 02-28-2014, 08:05 AM   #8
John Strenk
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Quote:
Originally Posted by Mike Romain View Post
The original harness has a fat red/orange wire coming from the firewall area at a crimp connector that feeds the power in run. This is the ballast wire and this is one of the 'custom ignition' parts that doesn't come with the painless harness. My centech harness came with a ceramic ballast resistor to replace this.
Here is the splice Mike is talking about with the resistance wire:



If there is ducktape on the splice then you know it's original...
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