TR - HEI wiring scematic - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 04-15-2002, 12:56 AM
**DONOTDELETE**
Guest
 
Posts: n/a
TR - HEI wiring scematic

TR can you please post the scematic and or any suggestions to installing a HEI unit with the coil in cap. I know your veiws on the external coil, but I already have the HEI in and want to check the way that it is wired (factory to HEI). BTW when is your website going to be up? Thanks for the info.
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 04-15-2002, 02:07 AM
 
Join Date: Sep 1999
Posts: 5,383
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: TR - HEI wiring scematic

I'm suffering through a host server that after all this time, the tech guys say the server is too slow...
I couldn't tell you, I'm completely host literate.
They have been promising 'Two weeks...' for five months...

One problem, we got hacked two days after we got the T-1 line, and the Chinese hackers really did a number on the system.
We've had to pretty much start from scratch again.
<hr>
As for the HEI...
Not my first choice, but here is the run down, please find your year vehicle...

If you are switching from a Motorcraft ignition ('78 to '90)
I think you are doing your self a disservice.
With just tune up parts you can kick the GM HEI's butt with the Motorcraft ignition, and not change anything but cap, rotor, wires and coil.

The feed wire in the '78 to '90 service is not large enough unless you strip back to the 10 Ga. fee wire.
You will start at the DuraSpark module Red wire, and strip back to the splice where it connects to a 10 Ga. wire.
Connect that 10 Ga. wire to your GM HEI, and your ignition should work pretty well to about 3,500 RPM, tach should work.
Behind this splice will give you a 10 Ga. source with no resistor in line.
Leave the other wires in the splice, and tape over the factory coil connections.
You will have to run a 10 Ga. wire from the 'I' terminal of the starter solenoid to the feed for the HEI (where you attach the connector for the HEI to the Splice is fine).
Disconnect the wire that is factory attached to the 'I' terminal, it's no longer needed.

(All stock GM HEI distributors become unstable around 3,500 RPM (or below), but a custom module and a remote coil will help with that)
---------------

I have nothing against the HEI for an upgrade from Prestolite. ('74 to '77)
I'd use a relay for the power wire, but if you strip the Prestolite module White wire back to the three way splice, and start from that wire, you should be fine, and your tach will work also.
---------------

If you have Delco points, ('73 &amp; older) you will need to find the positive feed wire to the coil.
You will have to use a relay to feed the GM HEI.
If you have this points system, post back and I'll give you a diagram.
<hr>

I assume you are installing in a 258 CID I-6.
If so, you might want to look into using the distributor cap and remote coil from a '76 Chevy 250 CID I-6.
Moving the coil from the cap is a BIG plus, and with the stock Chevy parts, it's only a two wire connector and a coil wire away.
Get it running and consider this later. It's just tune up parts, and it does make a difference.
Junk Yard Genius is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome