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Original Engine wiring conv. to hei schematic?

Need diagram of Original 65 engine, convesion to newer HEI ignition system.

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  • Cars & Trucks Master
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Dead simple. Old system used a resistor wire between ign. switch and coil. HEI does not need this so you need to run a 10 or 12 guage wire from the ignition switch "ON" position to the new coil with no resistor in between. This also means you no longer need the extra wire from the starter to the coil which was used to bypass the resistor wire in the old system to provide full 12 volts for starting car. The reason for the resistor wire in the circuit was to reduce the voltage to the coil once running so the amps in the spark would be higher to burn more thoughly and increase fuel mileage.

Posted on Apr 23, 2015

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1 Answer

1955 olds 88 hei ignition wiring to key and ignition system


Original system has a resistor wire between coil + and ignition key, to reduce voltage and thus increase amps to give fatter spark and increase fuel mileage. For HEI system, this resistor wire must not be used, so run new primary wire straight from switch "run" to coil +. There should already be a wire from the starter solenoid to the coil + to supply full 12 volts when cranking to give higher voltage spark to plugs to help jump the gap better for use while starting. The MSD web site has much more info.

Jul 05, 2016 | Cars & Trucks

1 Answer

INSTALLING HEI IGNITION AND NEED HELP


i have no issues WITH CAPS, used to have a home computer in 70s with ASR33 printing terminal that did all caps..... all the time.
Is this a 1990 jeep? and what engine? you never stated the engine
4.2 L AMC straight-6 engine?

what distributor are you running off what engine, and what year.
is it with full mech, advance and vacuum advance , pre 1986?
the nutter bypass, 4.2L
it cuts the ECU out of spark controls.

this means ECU advance is killed, on now only the dumb
module runs advance.
the stock system had a ballast resistance wire. and the
start wire to the the coil bypasses this wire. for full coil power.
this is not used in HEI.
infact there are many HEI setups. which one. 7wire. ?

here is 7
http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual_files/ew7hei.gif


if i had your rig, it upgrade it to MSD. sure would. done many.
by doing that , all the mystery of parts, that works ends.
if you need help, spec out your set up, including, schematic
and BOM, parts used, p/n of parts used.

here are 3 HEI ( 4,5,7 pin)

http://brianesser.com/tech/wiring/msd/WDTN_pn9615_Page_030.jpg

The biggest issues is spark timing curves.
getting them right for those Webers.
and standalone spark controls win here.

the right way
http://www.jegs.com/p/MSD-Ignition/MSD-Ignition-Controller-for-GM-EFI-Carbureted-LS-Engines/758329/10002/-1

You tune the spark advance for YOUR engine and setup.
not that funky stock spark box and nutter mod.

my guess, is you burned up the ballast when it hit the real
inside distributor coil primary, that is totally the wrong coil
for a ballast. I hope it dont burn up a good coil,,,,,,,
The coil and all wiring for EFI must be correct
and the bypass for starting , is useless. for that distrubutor
because it runs 12v all the time, so if the ballast did stay good
the HEI would be running way too low , at 8v. running.
and would fail.
here is a great HEI page, under dev. but is good.

http://www.crankshaftcoalition.com/wiki/Hot_rodding_the_HEI_distributor

this link above shows how to get HEI right on a carb car
but fails to show the benefits of true spark advance tuning.
Great fuel economy can be attained under light loads
with large spark advance. and then less under full load.
(no pinging too)
The spark advance , allows the flame front to start at the correct time
to take advantage of piston rod angles.... and not send unburned fuel out the exhaust.
Id put an MSD in there and tune it carefully, I would. (webers a given)_

Feb 03, 2014 | 1990 Jeep Wrangler

1 Answer

No spark to ignition


First, check the HEI distributor for extreme wear, and have the HEI module tested. Then, if you can do it, you need to check the crank sensor, and then the Engine Control Module.

Dec 23, 2011 | 1991 Buick Park Avenue

1 Answer

WHAT IS HEI ?


GM has offered High Energy Ignition (HEI) systems on vehicles starting with selected '74 models. HEI was standard on '75 and newer vehicles.

Check HERE for additional details.

Hope this helps (remember to rating this answer).

Oct 10, 2011 | Cars & Trucks

1 Answer

What do the symbols P and S stand for on terminals of the tachometer? 1978Chev.305 gas engine with distributor and coil.......jn my boat


tach hook up for chevy with hei distribitor is 1)white wire ; 12volt source 2)red wire -12 volt ignition switch (+) 3)black wire -battery ground (-) green wire ; to tach terminal on dist. / if it not hei with points just put green wire to neg. (-) side of coil

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1 Answer

Wiring for a small block 350


need to know if its a HEI cap and rotor or not. HEI caps have the coil built into them , an all in one ignition as compared to a external cylindrical coil.
you need to know that. either the distributor cap is a huge hurken thing (HEI) or it has an external coil somewhere or the cap has a ninth distributor hole in the middle of the cap to put a coil. wire.
after you figure out which one it is then you have to either go to www.autozone.com and study chevy wiring or buy a haynes manual for the similar vintage engine. for the external coil I would try a chilton manual for a chev truck before 1972. for HEI anytime thereafter. I may be off by a few years on the age of the engine. but hopefully you got an idea of what to do, or just google chev engine wiring? and study away.
good luck

jm

Jul 27, 2010 | 1980 Chevrolet Corvette

2 Answers

Replacement chevrolet distributor


Hei distrubitor with vaccum advance. Only real wire needed should be the power to your coil needs to go in on power on HEI. Might need a ground too not sure. Other then that it's optional. Like tach etc. Should slide right into place of the orginal. Just have to line up rotor an then time it. If you can work on the old system, the HEI's are ten times easier with the basic principals

Feb 18, 2010 | 1998 Chevrolet Tahoe

2 Answers

Late for everything...


Do you have any idea what ignition system it has, as there were 2 or 3 used in around those years on the AMC products. If it's the HEI system, I'd suspect (1) pickup coil in distributor, or (2) module in distributor. If it's not HEI, let us know and we can help further.

Nov 10, 2009 | 1983 AMC American Motors Eagle

1 Answer

Hei distributor on old L6 engiune won't fire coil


'56 engine was likely a "blue flame" engine that had a points type ignition system. If someone installed a HEI setup in there, you need to know what year vehicle it came from. The old system used a hot wire from the ignition switch to the (+) side of an external coil...the (-) lead went to the points. The most common conversion uses the same (+) wire but it then connects to the "batt" terminal on the distributor cap.(coil is inside) There are no other wires involved except for the short harness that goes directly into the distributor that connects the coil, pickup coil and control module to each other..

Sep 18, 2009 | 1999 GMC Sierra 3500

1 Answer

Need wireing diagram to change 72 nova over to hei distributor


Hey , just take the positive wire from the coil you are removing and feed it to the + terminal on the HEI dist. cap.the other terminal under there is for your tachometer. If you are mounting a master kill switch in the bumper for drag racing- attatch the kill wire to the tach terminal also.
Thats it you just plug the three wire pigtail from the dist. base(pickup) to the cap and you are off.
Remember firing order is 18436572 in a clockwise direction. to find #1 remove #1 plug and have someone"bump" the engine over while holding your finger over the hole-carefull. then line up the slotted mark on the crank pulley with the big notch on the timing indicator. Good luck

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