77 Wiring Differences For Aftermarket Harness
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Cruising
Joined: Nov 2020
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From: Utah
77 Wiring Differences For Aftermarket Harness
Looking at aftermarket wiring harnesses for a '77 project I'm interested in getting and notice all the direct fit aftermarket harnesses are only good for up to '76. I know that in '77 a couple gauges changed and the dimmer switch was moved to the column but were there more substantial changes than that to the wiring? Wondering if buying a direct fit harness and modifying a couple pieces would be easier install or if it's different enough to just save the money and get a universal harness? Any advice is much appreciated, thanks!
Race Director
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From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
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just to throw a spin on it for you. in 77 there are early and late harnesses. and different for manual and Auto. 4 different harnesses. and not certain where your looking. but they are available. first, look into what you have , an early or a late. then look a little further.
Race Director
Joined: Nov 2006
Posts: 13,282
Likes: 7,862
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
I just looked at Zip Corvettes site. they have them. and I am certain others will as well. lots of differences between 76 and 77. and 77 and 78. do yourself a favor. get the right one.
C3. 427, 4-link, c7 z06
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From: Virginia
I am going to start my 76 American Autowire install soon. It has the restomod circuits with spade fuses. Apparently you need the $150 crimp tools too so adding $1100 for the harness it wasn’t cheap. It took 6-7 weeks to get it from summit even though it was listed as in stock.
Ill post a progress update to my thread once I get more done. I have just done a few steps with the vintage air and power wires for the battery disconnect switches. I know this isn’t exactly what you are doing but I’ll keep checking your thread as well and maybe we can learn from each other
Ill post a progress update to my thread once I get more done. I have just done a few steps with the vintage air and power wires for the battery disconnect switches. I know this isn’t exactly what you are doing but I’ll keep checking your thread as well and maybe we can learn from each other
Race Director
Joined: Nov 2006
Posts: 13,282
Likes: 7,862
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
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not certain exactly what type of mods your running. I can say on my 77. I am running headlight relays, EFI , and electric fans. I run a stock harnesses but with an additional fuse panel mounted on the front side of the passengers footwell. a 4 gauge cable run to it. and wiring to high output alternator, EFI, headlight power, and fans fused through this extra panel. more than one way to skin a Cat.
