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#1 |
Registered User
![]() Join Date: Sep 2013
Location: Sioux Center IA
Posts: 184
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Ignition Switch Wiring
I am using a wiring harness, ECM, & TBI engine out of a 1987 R20 in my 66 C20. I want to use the ignition switch from the 66 and integrate it into the wiring harness of the 87. I have looked at both diagrams and am a bit confused on a couple.
66 Switch----------Function------------87 Harness Connector Red----------------Battery + ------------Red - 2qty Purple-------------Starter Solenoid------Purple Pink---------------Distributor or ECM----Pink Dark Green-------Ground- gauges?-----Tan/white - brake switch ground? Brown/White-----Accy- Fuse box-------Brown and Orange? ![]() |
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#2 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Ignition Switch Wiring
You are going to need a later model higher amp capacity switch to carry the load like come with the American auto wire kits. The stock switch will not carry the load.
Jimmy
__________________
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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#3 | |
Registered User
Join Date: Nov 2013
Location: Green Bay, WI
Posts: 435
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Re: Ignition Switch Wiring
Quote:
(on the 30->87 circuit)
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1966 C10 SWB Fleet 5.3L LM7 Vortec / 4L60e Swap 1966 C10 w/ 5.3L/4L60e Build Thread 2012 GMC Sierra 5.3L 4x4 CCSB |
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#4 |
Registered User
![]() Join Date: Sep 2013
Location: Sioux Center IA
Posts: 184
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Re: Ignition Switch Wiring
Good call PgSigns. I never thought about the amps. Since my ignition key also works the doors I might have to look into a relay like 66Lsx mentioned. Do I have the connecting wires correct?
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#5 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Ignition Switch Wiring
X2 on the relay.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#6 | |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Ignition Switch Wiring
Quote:
Yes, it looks like you've identified most of the wires correctly. Just to expand on things a bit: The 87 wiring is likely to have a yellow wire (instead of purple) running from the ignition switch "SOL" terminal to the neutral safety switch. It should transition to a purple wire for the section that runs from the neutral safety switch to the starter solenoid though. The dark green and tan/white wires are both switched to ground to illuminate the "TEMP" and "BRAKE" warning lights as a "bulb check" feature when cranking the engine. Dark green is for the temp light and will not be needed if your truck has a temperature gauge instead of a light. Tan/white is for the brake warning light and will only be needed if you're adding one of these lights to your 66 cluster. The brown/white wire is the alternator "exciter" wire and is a special resistance wire. If the 87 harness came from a truck that had factory gauges then it should have a similar brown/white resistance wire connected to the same terminal as the orange wire. But if it came from an 87 that had a warning light cluster then it will have the alternator "exciter" wire routed through the alternator warning light. You may or may not need this circuit depending on the alternator you'll be using. |
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#7 |
Registered User
![]() Join Date: Sep 2013
Location: Sioux Center IA
Posts: 184
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Re: Ignition Switch Wiring
Thanks for the great info! I did not know about the alternator exciter. I learn something new every day!
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#8 |
Senior Member
![]() Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Ignition Switch Wiring
I would have to sit down with the wiring diagrams for both trucks. That I don't have time for. You can get the switch you need and the connectors for it from AAW. I would do that over relays to keep it simple. Cost would be about the same. Your headlight switch is gonna be that same way. Gonna need a late model switch or the one out of the donor.
Jimmy
__________________
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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#9 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Ignition Switch Wiring
You're welcome!
And a bit more info on that alternator "exciter" wire ... Most of the stock ones are a section of 2Ω per foot resistance wire that's about 5 feet long (for a total of about 10Ω). That's good if you're using a 10SI or 12SI internally regulated alternator. You'll need to add more resistance to the circuit if you're using a newer CS alternator though. And you won't have to worry about that wire at all if you're using a "1 wire" alternator. |
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