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#1 |
Registered User
Join Date: May 2015
Location: Richland, WA
Posts: 128
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66 Wiring help for HEI
I have added an HEI distributor and need some help on the wiring.
I have the two yellow wires that used to go to the points distributor a green wire and a black wire with a rubber connector. There are another set of wires that have been taped up prior so I'm thinking not important yet.... Anyone have ideas with the colors described before I start testing? Thank you. |
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#2 |
Registered User
Join Date: May 2015
Location: Richland, WA
Posts: 128
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Re: 66 Wiring help for HEI
OK, after cleaning and removing the harness tape here is what I have found.
Dark Green Light Green Blue (w/ rubber connector) Yellow White(braided) The white(braided) wire is connected to the yellow with a spade terminal that I think went to the old distributor. Thanks. |
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#3 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: 66 Wiring help for HEI
For the HEI you will want to run a new wire from the fuse box. There should be a terminal that is only hot with the key on. Run a new wire off that. That way you don't have a resister wire running to it.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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#4 |
Registered User
![]() Join Date: Sep 2006
Location: San Francisco
Posts: 4,780
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Re: 66 Wiring help for HEI
Tape up all the old wires from the coil. You can also use the pink wire going to your ignition switch. If you can go to a bone yard and cut a wire from an HEI as long as you can. I believe you can buy them also. Here http://www.summitracing.com/search/p...wer%20Pigtails Get the two wire if you are going to run a Tach.
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"A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536 |
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#5 |
Registered User
Join Date: Apr 2014
Location: calgary alberta
Posts: 1,248
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Re: 66 Wiring help for HEI
one hot off your key and another for your tach is all the hei needs
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#6 |
Registered User
Join Date: Oct 2012
Location: Philly, PA
Posts: 537
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Re: 66 Wiring help for HEI
Make sure to pull that white braided wire and toss it as far from your truck as possible, then find it and toss it a again. That resistor wire is a major pain in the @ss if hooked up to the HEI.
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My truck ain't dead, it just smells funny. |
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#7 |
Registered User
Join Date: May 2015
Location: Richland, WA
Posts: 128
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Re: 66 Wiring help for HEI
So dont just replace the braided wire. Run a new wire from the fuse block to the hei?
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#8 |
Registered User
Join Date: Oct 2012
Location: Philly, PA
Posts: 537
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Re: 66 Wiring help for HEI
Here's a good HEI swap thread that covers wiring ... http://67-72chevytrucks.com/vboard/s...d.php?t=599564
I'm also throwing in a shot of the wiring harness for a 6 cylinder with dummy lights. If I recall correctly, it uses type 56 terminals. BTW, it's a pic prior to swapping out to an HEI ...
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My truck ain't dead, it just smells funny. |
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#9 |
Registered User
Join Date: Sep 2012
Location: oceanside CA
Posts: 706
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Re: 66 Wiring help for HEI
as stated above find a switched power source on the fuse box use red color run it from that source to the terminal for it i believe it says batt on it but don't quote me the other terminal is for a RPM Tach so it you run one hook it up there and if not then don't worry about it .. now as for the old wiring its all useless but and im not bashing anyone . i just feel like maybe you would like to know why it is useless and i saw that it was not explained yet . so here it is in simple terms .. the points distributor can only handle so much voltage going to the points so they put that white braided wire AKA resistor wire in line to reduce the voltage so that your points wont cook ... a common mistake lots of people make when changing over to HEI is they use that wire and it will start and run but it runs badly because the HEI is not getting full voltage . so you get popping and sputtering under a load .. next im not sure if this is your 1st HEI Swap or not or even what engine your doing it in but lets just say if its a V8 after stabbing in the HEI go to your local parts store and buy a HEI re curve kit and fallow the directions on the package for your weight of vehicle and re curve it for that this is so that your new HEI Swap is tuned to your truck and engine a good match . this is done because some people will go pull a HEI out of a car lets say and put it in a bigger heaver car or truck and now the HEI isent giving optimal timing advance ... after this re curve kit is done simply set the initial timing at 12 to 13 degrees and your done should only take you about a Hour for the whole thing ... Happy Truckin
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#10 |
Registered User
Join Date: Aug 2013
Location: sumterville, florida
Posts: 914
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Re: 66 Wiring help for HEI
an easier way is to use the existing coil wire to trigger a bosch relay and run the hei power from b+ on the starter. use a 16 gauge fusible link off the starter connection.
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#11 |
Registered User
Join Date: Jan 2013
Location: Columbia, SC
Posts: 1,927
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Re: 66 Wiring help for HEI
Don't use just any gauge wire to the HEI. Make sure it's a 10 gauge.
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My 65 C10 build: www.lugnutz65chevystepside.weebly.com Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild. |
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#12 |
Registered User
Join Date: Aug 2013
Location: sumterville, florida
Posts: 914
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Re: 66 Wiring help for HEI
10 gauge is fine. so is 12 but if you use a fusible link don't run a 10 gauge link
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#13 |
Registered User
Join Date: May 2015
Location: Richland, WA
Posts: 128
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Re: 66 Wiring help for HEI
Thank you all for such great info. Im going to hit it today and see if I can get everything running.
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