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Old 11-01-2014, 06:06 PM   #1
papsoldblue72
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Question wiring HEI

Is there any good wiring diagrams for changing over to a internal regulator alternator and HEI distributor ??? All I am finding is ones with original equipment..... Please help ...
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Old 11-01-2014, 07:30 PM   #2
VetteVet
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Re: wiring HEI

These should help.


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..........http://67-72chevytrucks.com/vboard/s...d.php?t=417872
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Old 11-01-2014, 11:35 PM   #3
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Re: wiring HEI

Also, if you search the FAQ's there are a couple of good write ups. Try one by member "shifty" it has instructions and part # for the connector that go in the bulkhead fitting. You can run a new wire and have it terminate like stock. It's written for a six but is the same.
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Old 11-01-2014, 11:40 PM   #4
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Question Re: wiring HEI

Ok now I'm really confused and I still don't see the alternator part of the wiring..... I still need more details......... But thanks VetteVet.....
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Old 11-01-2014, 11:43 PM   #5
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Re: wiring HEI

Quote:
Originally Posted by PanelDeland View Post
Also, if you search the FAQ's there are a couple of good write ups. Try one by member "shifty" it has instructions and part # for the connector that go in the bulkhead fitting. You can run a new wire and have it terminate like stock. It's written for a six but is the same.
Ok thanks PanelDeland I will check into it....
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Old 11-02-2014, 01:34 AM   #6
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Re: wiring HEI

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Originally Posted by VetteVet View Post

There are a couple of ways to do this. Look at the picture below and you'll see a
cloth looking covered wire in the firewall block. It was originally a white/ orange/ purple wire and it comes from the key switch as a pink ignition wire. It joins a yellow wire that comes from the starter R terminal. This wire is a resistance wire that drops the battery voltage to the coil down to 9 volts to protect the coil from burning up during normal running. The yellow wire is a jumper to send a full 12 volts to the coil for a hotter spark while the starter is turning. This facilitates easier starts and after the starter kicks out the coil gets power from the resistor wire.

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Starter wiring.

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Engine wiring diagram for the factory trucks, note the O/W/P
wire on the right side going to the coil from the firewall.

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You can split the firewall block and remove the O/W/P wire and run a new 12 gauge red wire to the HEI distributor to the BATT terminal, see the above diagram in my first post. Also look at the thread that PanelDeland posted, by SHIFTY.


OR
You can do what most guys do and just run a 12 gauge red wire from the fuse panel where it says HEI UNFUSED out to the HEI distributor to the BATT terminal. It tells you that at the bottom of the diagram I posted in my first post.

Did you see the link I posted under the diagram in my first post and click on it?.......... It's in the quoted part of this post.

I'll try to find Shifty's thread for the conversion to HEI.
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Old 11-02-2014, 02:00 AM   #7
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Re: wiring HEI

Here it is.

.....http://67-72chevytrucks.com/vboard/s...d.php?t=148346
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Old 11-02-2014, 02:37 AM   #8
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Re: wiring HEI

The charging system (alternator) is one circuit. The ignition system (HEI) is another circuit.

Don't confuse the two and don't try to change both circuits at the same time. Learn about one system and the changes you need to make and make sure it is fully functional before you move on.
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Old 11-02-2014, 07:43 AM   #9
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Re: wiring HEI

Add a heavy enough hidden kill switch in the HEI wire is a good idea while you are at it.
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Old 11-02-2014, 11:41 AM   #10
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Re: wiring HEI

Thanks everyone and special thanks to VetteVet that helped a lot... I think I can get with all the info I have now .... thanks again....
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