HEI install question (wiring) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Slow Build · 05-30-2010, 04:32 PM

I know this has been somewhat covered, but it's a bit confusing to me.

Doing the swap to HEI distributor slowly. I was wondering if I could do the wiring like I have in the diagram. Remove the 2 wires from the old coil then run new 12 gauge wire from the run terminal of the starter solenoid (where the yellow wire was connected) to the Bat+ terminal on the HEI. It seems to me that since the battery is connected directly to the solenoid with large cable that this would be a good source of 12 volt supply or would I be possibly overloading the wiring inside the solenoid itself. Any thoughts?

raycow · 05-30-2010, 04:59 PM

The "R" on the solenoid terminal doesn't stand for Run. That terminal gets a full 12 volts only when the engine is cranking and is used to bypass the resistance wire used with the stock points system. The resistance wire is the one marked "20-P" on the diagram. You will need to feed your HEI from some point which is hot with the ignition switch on and does not go through the resistance wire.

Ray

Rich 5150 69 · 05-30-2010, 06:52 PM

I just run the pink wire from the ignition switch to the HEI.

Slow Build · 05-30-2010, 06:55 PM

I knew that was too easy. Electrical ain't my thing.

Rich 5150 69 · 05-30-2010, 07:00 PM

Its not mine either unless I have a boat load of instructs...LMAO
You`ll haqve two leads on the HEi one is for Tach, it should be marked on the dizzy cap...

geezer#99 · 05-30-2010, 07:01 PM

I just finished putting an HEI on my 230 six banger this afternoon. Disconnected the yellow wire off the solenoid and the wire off the coil and taped them up real good. Ran a new 12 gauge wire with a 30 amp in line fuse and connected it to an unfused connection on my fuse panel. Fired right up. Set the timing at 12 degrees and went for a spin around the block. Took about 2 hours.

fryer1979 · 05-30-2010, 10:21 PM

Every time I have done the swap I usually go to the fuse box and look for an alternated (12 volts with the ignition in the "on" position only) power source that is not shared with any other devices. Once I find an empty lead I just run a wire from that to the power terminal on the HEI. I don't know much yet about our generation trucks, but there should be a good place to get a good alternated power source at or near the fuse box. I've always been told to keep the power lead to the HEI as it's own source, something about attaching other leads causing electrical feedback. I don't know how true this is, but I have always followed this advice and I have never had an issue with any HEI system I instal (and I use them on everything).

**Chevy Fleetside** · 05-30-2010, 10:30 PM

Ran mine for over 4 years off of the pink wire from the ignition switch. I usually cut the wire off of a donor car/truck long enough to reach.

Slow Build · 05-31-2010, 12:29 AM

I should be able to figure it out. I have a few things to do before I stick the HEI in though (switching back to original mechanical oil pressure gauge). I need to put blinders on though. I see lots of stuff I need to do (you know the since I'm doing this I might as well do that syndrome).

Thanks for your help guys.

Joemomma1 · 05-31-2010, 12:31 AM

Quote:

Originally Posted by Chevy Fleetside

Ran mine for over 4 years off of the pink wire from the ignition switch. I usually cut the wire off of a donor car/truck long enough to reach.

I also used the pink wire but added a 10ga or 12ga wire to the engine harness. Works great.

raycow · 05-31-2010, 01:16 AM

Looking at your diagram, I would say the pink wire IS the resistance wire.

Ray

burbguy · 05-31-2010, 01:41 AM

hey rich bring it over and a six pack of coors light, and I'll give you a hand...

Slow Build · 05-31-2010, 01:50 AM

Quote:

Originally Posted by burbguy

hey rich bring it over and a six pack of coors light, and I'll give you a hand...

Too late. I already got my grubby hands on it. Thanks for the offer though Shawn.

Slow Build · 06-09-2010, 12:13 AM

Yes. I'm finally done with the HEI swap. Thanks for all your help guys. I thought I was never going to finish it. Between my daughter needing me so she could beat me on the Wii, my wife and her to do lists, my aching back and that syndrome I talked about earlier, it wasn't easy. I also ended up switching back to the stock gauges and senders, changing from an SP2P intake to a performer and re-routing some of the electical under the hood. Still have a little dialing in to do but it's back on the road again.

Again thanks to everybody for your help.

05-30-2010, 04:32 PM	#1
Slow Build Registered User Join Date: Sep 2009 Location: California Delta Posts: 2,163	HEI install question (wiring) I know this has been somewhat covered, but it's a bit confusing to me. Doing the swap to HEI distributor slowly. I was wondering if I could do the wiring like I have in the diagram. Remove the 2 wires from the old coil then run new 12 gauge wire from the run terminal of the starter solenoid (where the yellow wire was connected) to the Bat+ terminal on the HEI. It seems to me that since the battery is connected directly to the solenoid with large cable that this would be a good source of 12 volt supply or would I be possibly overloading the wiring inside the solenoid itself. Any thoughts? Attached Images __________________ Name: Rich Current Ride: 1964 C-10 Short Fleetside Daily Driver: 2005 GMC crew cab short fleetside /2001 Chevy Tahoe Past GM Trucks: 1959 GMC short stepside 1968 GMC short stepside-4x4 1973 Chevy short stepside 1989 Chevy short fleetside-reg cab 1993 Chevy short fleetside-Xcab 2002 Chevy short fleetside-Xcab Save the dinosaurs, use synthetic oil. Last edited by Slow Build; 06-08-2010 at 11:59 PM.

05-30-2010, 04:59 PM	#2
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: HEI install question (wiring) The "R" on the solenoid terminal doesn't stand for Run. That terminal gets a full 12 volts only when the engine is cranking and is used to bypass the resistance wire used with the stock points system. The resistance wire is the one marked "20-P" on the diagram. You will need to feed your HEI from some point which is hot with the ignition switch on and does not go through the resistance wire. Ray Last edited by raycow; 05-30-2010 at 05:05 PM.

05-30-2010, 06:52 PM	#3
Rich 5150 69 Registered User Join Date: Nov 2009 Location: Galt, Calif Posts: 2,437	Re: HEI install question (wiring) I just run the pink wire from the ignition switch to the HEI. __________________ `64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip

05-30-2010, 06:55 PM	#4
Slow Build Registered User Join Date: Sep 2009 Location: California Delta Posts: 2,163	Re: HEI install question (wiring) I knew that was too easy. Electrical ain't my thing. __________________ Name: Rich Current Ride: 1964 C-10 Short Fleetside Daily Driver: 2005 GMC crew cab short fleetside /2001 Chevy Tahoe Past GM Trucks: 1959 GMC short stepside 1968 GMC short stepside-4x4 1973 Chevy short stepside 1989 Chevy short fleetside-reg cab 1993 Chevy short fleetside-Xcab 2002 Chevy short fleetside-Xcab Save the dinosaurs, use synthetic oil.

05-30-2010, 07:00 PM	#5
Rich 5150 69 Registered User Join Date: Nov 2009 Location: Galt, Calif Posts: 2,437	Re: HEI install question (wiring) Its not mine either unless I have a boat load of instructs...LMAO You`ll haqve two leads on the HEi one is for Tach, it should be marked on the dizzy cap... __________________ `64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip Last edited by Rich 5150 69; 05-30-2010 at 07:01 PM.

05-30-2010, 07:01 PM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,712	Re: HEI install question (wiring) I just finished putting an HEI on my 230 six banger this afternoon. Disconnected the yellow wire off the solenoid and the wire off the coil and taped them up real good. Ran a new 12 gauge wire with a 30 amp in line fuse and connected it to an unfused connection on my fuse panel. Fired right up. Set the timing at 12 degrees and went for a spin around the block. Took about 2 hours.

05-30-2010, 10:21 PM	#7
fryer1979 Redneck Hillbilly Join Date: Jan 2010 Location: Backwoods Posts: 1,307	Re: HEI install question (wiring) Every time I have done the swap I usually go to the fuse box and look for an alternated (12 volts with the ignition in the "on" position only) power source that is not shared with any other devices. Once I find an empty lead I just run a wire from that to the power terminal on the HEI. I don't know much yet about our generation trucks, but there should be a good place to get a good alternated power source at or near the fuse box. I've always been told to keep the power lead to the HEI as it's own source, something about attaching other leads causing electrical feedback. I don't know how true this is, but I have always followed this advice and I have never had an issue with any HEI system I instal (and I use them on everything).

05-30-2010, 10:30 PM	#8
Chevy Fleetside Registered User Join Date: Sep 2006 Location: San Francisco Posts: 4,781	Re: HEI install question (wiring) Ran mine for over 4 years off of the pink wire from the ignition switch. I usually cut the wire off of a donor car/truck long enough to reach. __________________ "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

05-31-2010, 12:29 AM	#9
Slow Build Registered User Join Date: Sep 2009 Location: California Delta Posts: 2,163	Re: HEI install question (wiring) I should be able to figure it out. I have a few things to do before I stick the HEI in though (switching back to original mechanical oil pressure gauge). I need to put blinders on though. I see lots of stuff I need to do (you know the since I'm doing this I might as well do that syndrome). Thanks for your help guys. __________________ Name: Rich Current Ride: 1964 C-10 Short Fleetside Daily Driver: 2005 GMC crew cab short fleetside /2001 Chevy Tahoe Past GM Trucks: 1959 GMC short stepside 1968 GMC short stepside-4x4 1973 Chevy short stepside 1989 Chevy short fleetside-reg cab 1993 Chevy short fleetside-Xcab 2002 Chevy short fleetside-Xcab Save the dinosaurs, use synthetic oil.

05-31-2010, 01:16 AM	#11
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: HEI install question (wiring) Looking at your diagram, I would say the pink wire IS the resistance wire. Ray

05-31-2010, 01:41 AM	#12
burbguy Registered User Join Date: Mar 2009 Location: Livermore,Ca. Posts: 114	Re: HEI install question (wiring) hey rich bring it over and a six pack of coors light, and I'll give you a hand... __________________ Shawn 1966 short fleet 230 I-6 three in the tree (daily driver) 1966 short fleet big block th400 (building slowly) 1972 c10 3 door suburban 350 th350 (building faster than slowly) 2004 F250 power stroke (not dependable enough to be a daily driver) 2005 Kenworth T-800 Heavy Haul tractor (that's my true daily driver)

06-09-2010, 12:13 AM	#14
Slow Build Registered User Join Date: Sep 2009 Location: California Delta Posts: 2,163	Re: HEI install question (wiring) Yes. I'm finally done with the HEI swap. Thanks for all your help guys. I thought I was never going to finish it. Between my daughter needing me so she could beat me on the Wii, my wife and her to do lists, my aching back and that syndrome I talked about earlier, it wasn't easy. I also ended up switching back to the stock gauges and senders, changing from an SP2P intake to a performer and re-routing some of the electical under the hood. Still have a little dialing in to do but it's back on the road again. Again thanks to everybody for your help. __________________ Name: Rich Current Ride: 1964 C-10 Short Fleetside Daily Driver: 2005 GMC crew cab short fleetside /2001 Chevy Tahoe Past GM Trucks: 1959 GMC short stepside 1968 GMC short stepside-4x4 1973 Chevy short stepside 1989 Chevy short fleetside-reg cab 1993 Chevy short fleetside-Xcab 2002 Chevy short fleetside-Xcab Save the dinosaurs, use synthetic oil.



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