Wiring Ignition - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1971Stepside** · 01-24-2019, 05:31 PM

Gentleman. I am very close to turning the key for the first time on my LS. My goal is to fire her on my 50th birthday next month. I found my original ignition and key in a box and would like to use it to start the motor. Keep in mind I have the cab sitting on the frame, but basically we have a rolling chassis without any wiring in the cab. How would I go about wiring up the ignition to work? I know i need to go to the starter, but what else and if you have a diagram of the pins I would really appreciate it.

**mongocanfly** · 01-24-2019, 05:56 PM

All you'll need from the switch to the LS ecm is switch on power...other than that the switch works just like it would on any engine...

**1971Stepside** · 01-24-2019, 06:37 PM

Well that sounds simple enough, but I took this thing apart so long ago that I don't remember what wire went to where on the ignition. I can a lot of mechanical work, but wiring just throws me.

**1971Stepside** · 01-24-2019, 06:55 PM

I guess to clarify:

Purple wire = Starter Terminal
Red Wire = To Battery
Brown Wire = Acc Wire (do I need to hook this to anything now?)
Brown/White Wire = Alternator Reg (I assume I don't need)
Pink Wire = Ignition Coil (can I use this one for the ECM?)
Tan Wire = Brake Warning to Dash (don't need now)
Green Wire = Temp Sender to Dash (don't need now)
Dashed Purple Wire = Neutral Start Switch (don't need now)

Is this correct? Thank you in advance.

**mongocanfly** · 01-24-2019, 08:02 PM

the wire that went to the coil/hei is the one I used for my switch on power....I think it is pink

cebra · 01-25-2019, 10:00 AM

This is how mine is wired anyways:

Purple wire = Starter Terminal (Needed to Start)
Red Wire = To Battery (Needed to Feed Power to Switch)
Pink Wire = Ignition Coil (Yes, Goes to Pink/Black on my Harness to Power ECU)
Brown Wire = Acc Wire (Not Needed Now)
Brown/White Wire = Alternator Reg (Not Needed Now)

**1971Stepside** · 01-25-2019, 10:16 AM

Thank you cebra and mongocanfly. Looking forward to this.

**1971Stepside** · 01-25-2019, 01:23 PM

Just confirming...does this look correct?

TA_C10 · 09-20-2019, 02:52 PM

Stepside I just ran across this thread again. I am starting to plan out my power protection plan and bulkhead/PCM harness wiring. Did you wire your alt to the starter? What did you do if I may ask? I'm trying to figure out what size circuit breakers to use and where.

This is something similar to what I am thinking.

01-24-2019, 05:31 PM	#1
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Wiring Ignition Gentleman. I am very close to turning the key for the first time on my LS. My goal is to fire her on my 50th birthday next month. I found my original ignition and key in a box and would like to use it to start the motor. Keep in mind I have the cab sitting on the frame, but basically we have a rolling chassis without any wiring in the cab. How would I go about wiring up the ignition to work? I know i need to go to the starter, but what else and if you have a diagram of the pins I would really appreciate it. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-24-2019, 05:56 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,592	Re: Wiring Ignition All you'll need from the switch to the LS ecm is switch on power...other than that the switch works just like it would on any engine... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

01-24-2019, 06:37 PM	#3
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Wiring Ignition Well that sounds simple enough, but I took this thing apart so long ago that I don't remember what wire went to where on the ignition. I can a lot of mechanical work, but wiring just throws me. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-24-2019, 06:55 PM	#4
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Wiring Ignition I guess to clarify: Purple wire = Starter Terminal Red Wire = To Battery Brown Wire = Acc Wire (do I need to hook this to anything now?) Brown/White Wire = Alternator Reg (I assume I don't need) Pink Wire = Ignition Coil (can I use this one for the ECM?) Tan Wire = Brake Warning to Dash (don't need now) Green Wire = Temp Sender to Dash (don't need now) Dashed Purple Wire = Neutral Start Switch (don't need now) Is this correct? Thank you in advance. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-24-2019, 08:02 PM	#5
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,592	Re: Wiring Ignition the wire that went to the coil/hei is the one I used for my switch on power....I think it is pink __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

01-25-2019, 10:00 AM	#6
cebra Registered User Join Date: Jan 2018 Location: Durham, North Carolina Posts: 782	Re: Wiring Ignition This is how mine is wired anyways: Purple wire = Starter Terminal (Needed to Start) Red Wire = To Battery (Needed to Feed Power to Switch) Pink Wire = Ignition Coil (Yes, Goes to Pink/Black on my Harness to Power ECU) Brown Wire = Acc Wire (Not Needed Now) Brown/White Wire = Alternator Reg (Not Needed Now) __________________ My Daily Driver Build: http://67-72chevytrucks.com/vboard/s...d.php?t=755668

01-25-2019, 10:16 AM	#7
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Wiring Ignition Thank you cebra and mongocanfly. Looking forward to this. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-25-2019, 01:23 PM	#8
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: Wiring Ignition Just confirming...does this look correct? Attached Images __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-20-2019, 02:52 PM	#9
TA_C10 Registered User Join Date: Jun 2018 Location: Texas Posts: 1,353	Re: Wiring Ignition Stepside I just ran across this thread again. I am starting to plan out my power protection plan and bulkhead/PCM harness wiring. Did you wire your alt to the starter? What did you do if I may ask? I'm trying to figure out what size circuit breakers to use and where. This is something similar to what I am thinking. __________________ TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". Last edited by TA_C10; 09-20-2019 at 03:17 PM.



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