Need HEI Conversion Wiring Help - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > Need HEI Conversion Wiring Help

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed Line~Artec JK 1 TON SWAP~Advance Adapters SYE Kits

Reply
Unread 11-13-2009, 05:15 PM   #1
guysnydr
Registered User
1983 CJ7 
 
Join Date: Aug 2007
Location: Pennsylvania
Posts: 170
Need HEI Conversion Wiring Help

Hi all, I am strongly considering an HEI swap on my 79 CJ7 258 6. Couple of questions. Do I still need the icm box that's on the DS inner fender or can I get rid of that with the swap? Also, what existing wires will go where on the HEI? I have a stock distributor now with some wires coming out of it and also of course the + and - leads on the coil. If someone could let me know I would sure appreciate it. Thanks in advance! - Guy Snyder Trout Run, PA

guysnydr is offline   Reply With Quote Quick reply to this message
Unread 11-13-2009, 08:00 PM   #2
Tager705
Registered User
1983 CJ7 
 
Join Date: Jan 2009
Location: Lincoln, NE
Posts: 61
All you need is a good +12 volt lead, I used the wire off my old coil, and a plug salvaged from a old GM pick up in the junk yard. You will need to move your dipstick a little and remove the old coil, and to adjust stuff if you still have stock air filter assembly it will need to be taken off while you adjust stuff. Also I found the distributor fits better with the vacuum advance parallel and closest to the fire wall. which requires the wires be about 180 degrees from their position on the AMC distributor. I will try to post a photo of mine in the morning.
__________________
83 CJ7 258 AMC TF999 Dana300
It Idles now :D
http://www.jeepforum.com/gallery/data/4/PIC-0294.JPG
Tager705 is offline   Reply With Quote Quick reply to this message
Unread 11-14-2009, 06:12 AM   #3
JeepHammer
Running On Empty...
1973 CJ5 
 
Join Date: Aug 2007
Location: South West Indiana
Posts: 10,204
The factory feed wire to the ignition coil has a resistor in line.
This will limit the effectiveness of the HEI ignition.
The factory wiring is undersized for the HEI ignition also.

The 'Easy' way to feed the HEI is with a Power Relay.
With a Power Relay, you will be able to feed the HEI with a CLEAN power source,
And you will be able to supply it with proper gauge wire so it works at well as any HEI can.

All new car ignitions use power relays to the ignition because of these facts.

If you need diagrams for this conversion, let me know and I can provide them.
JeepHammer is offline   Reply With Quote Quick reply to this message
Unread 11-14-2009, 11:20 AM   #4
Tager705
Registered User
1983 CJ7 
 
Join Date: Jan 2009
Location: Lincoln, NE
Posts: 61
Here Are the photo's of how mine is oriented, I heard that the original coil wire has a Resistor in it but as near I can tell , mine runs great off the stock coil wire. There was a resistor on the old plug off the GMC pickup going from one pole to the other I cut it out and it works fine.


I just zip tied the old distributor wires to the fire wall.

Allot of people upgrade the feed with 10 gauge wire.

Mine runs fine on the stock wire I was out playing in a mud pit with it and it never missed a beat.
__________________
83 CJ7 258 AMC TF999 Dana300
It Idles now :D
http://www.jeepforum.com/gallery/data/4/PIC-0294.JPG
Tager705 is offline   Reply With Quote Quick reply to this message
Unread 11-14-2009, 11:56 AM   #5
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,565
I would use the stock coil power wire to turn on a relay to give full power to the HEI. Stock the coil only gets 9 or 10 volts when the engine is running. I think the hotter spark boosts gas mileage. I have a hot coil and get 21 mpg highway.
__________________
Mike
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)
Mike Romain is offline   Reply With Quote Quick reply to this message
Unread 11-14-2009, 06:33 PM   #6
guysnydr
Registered User
1983 CJ7 
 
Join Date: Aug 2007
Location: Pennsylvania
Posts: 170
Thanks a million for all this good info. Also, can I just unhook and get rid of the original icm box then?
guysnydr is offline   Reply With Quote Quick reply to this message
Unread 10-06-2012, 10:14 AM   #7
Schzap
Registered User
1984 CJ7 
 
Join Date: Sep 2012
Location: Blue Springs, Mo
Posts: 28
Ugh I feel so behind the curve here..im still working on getting my amc360 into my 84 cj7...i see many prefer the hei and it seemed cheaper than relpacing all the other "who knows if its good" parts, im aware ill need to change the gear..check...now about these wires... the hei has two..rocket science now..one is ground since i dont think any wiring on this is "switched ground" now the other i assume is 12 volts (ok so 11-13.8 depending on altenator) now...if you were me... which wire would you grab to hook it into this? i see no plugs that will slip into the plug hole on the hei..i assume i will need to use a couple of spade connectors and use some wires from the previous system.
oh heck..this may get me bumped but while here...which wires should i grab to run back for a fuel pump? my 360 has the mechanical pump plated off and i dont care to open that can o worms... i assume a swithced 12v, and just ground really close to the pump (say the holes i have to drill to mount the bugger?)
im not an idiot, but treat me like one please? more info is way better than missing some key component. like..."oh use a clutch alignment tool to get things straight before attempting to put the engine in...THAT would have saved me 3 days and about a quart of useful red blood cells....

or if by chance anyone is within driving distance of my home town...i will provide booze for help/advice. (this always works in the movies)
Schzap is offline   Reply With Quote Quick reply to this message
Unread 10-06-2012, 12:13 PM   #8
Dngrs1
Registered User
1979 CJ7 
 
Join Date: May 2009
Location: Mohave Valley,AZ
Posts: 804
Quote:
Originally Posted by Schzap View Post
im not an idiot, but treat me like one please?
Reviving a 3 year old thread when all the info you want is in the sticky's?
The HEI has an internal ground; the second wire is for a tach.
__________________
I would rather have a tool I don't need, than need a tool I don't have.
Dngrs1 is offline   Reply With Quote Quick reply to this message
Unread 02-19-2013, 07:29 AM   #9
Schzap
Registered User
1984 CJ7 
 
Join Date: Sep 2012
Location: Blue Springs, Mo
Posts: 28
I'm an electronics tech...with little background in vehicle maintenance so the magical secret grounds on my CJ were a mystery. Now that everything not a wire is now ground things became much more clear...like gauges with only one wire...thank you to all here who put up with noobs lost in a sea of information. John Strenk had the gauge info. That's a cool dude.
Schzap is offline   Reply With Quote Quick reply to this message
Unread 02-19-2013, 07:45 AM   #10
brownbagg
Registered User
1930 MK Compass 
 
Join Date: Feb 2010
Location: pearl, la
Posts: 2,458
pertronix makes an electronic pickup that replaces the points in an old distrubor, I myself have the gm hei but the pertronix would have no wiring modification or looking for a junkyard distrubor
brownbagg is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.