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#1 |
YA YA
Join Date: Aug 2004
Location: Rockledge, Fl
Posts: 1,273
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Wiring Harness question
Is there any difference between a big block wiring harness and a 350 wiring harness? I'm speaking of both the underdash and the engine bay harnesses.
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Jimbo '72 SWB - 350 (frame-off resto in progress - donations accepted) '04 Chevy Avalanche '03 Cadillac CTS (wife's ride) Restoration progress - http://67-72chevytrucks.com/vboard/s...d.php?t=335707 |
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#2 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,946
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Under dash should be the same, it only changes with gauges or idiot lights and not engine type. Under hood stuff may be different for BB/SB...
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#3 |
YA YA
Join Date: Aug 2004
Location: Rockledge, Fl
Posts: 1,273
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Cool - I'm changing from idiot lights to gauges so that's works out. I'm hoping the engine harness is the same as well.
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Jimbo '72 SWB - 350 (frame-off resto in progress - donations accepted) '04 Chevy Avalanche '03 Cadillac CTS (wife's ride) Restoration progress - http://67-72chevytrucks.com/vboard/s...d.php?t=335707 |
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#4 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,946
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I bet you can make the eng harness work even if it is different, my old SB truck was originally a 292 and everything worked ok.
Even if your harness is beat up, the replacement and upgrade (HEI and internal regulator alt) harness are pretty cheap. I got both underhood harnesses from GMCPauls for around $250. That's cheap insurance to not have a short and possible fire.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#5 |
Senior Member
Join Date: Apr 2005
Location: Joppa, Maryland
Posts: 4,408
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I bought my engine harness from MotherTruckers and got the HEI upgrade with it. He's the least expensive I found, and the harness fit like a glove and looks great. I don't think there is any difference between SBC & BBC engine or dash harnesses. There is a difference between an auto or manual trans engine harness though. Mine was a manual and when I ordered the harness, was asked if it was a manual or auto trans.
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1997 GMC Sierra Ext 1965 Mustang |
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#6 |
Registered User
Join Date: Jul 2005
Location: DFW
Posts: 463
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Does anybody know where to get the terminals themselves? (The ones inside the firewall plugs?) About 13 years ago I built a 66 Dart, and it used the same terminals. I searched everywhere and finally found them at a local parts shop. That shop went of out business several years ago :/
I've drawn up a new pinout for completely new underhood harnesses. Buying them is so damn expensive, you're only getting about $20 worth of parts for $200+ ... I just can't do it :P My new harness integrates a pair of relays for the headlights, a rad fan relay, hei, internal regulated alt, and a remote starter solenoid. I'm ready to get it made but..I need those damn terminals! |
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#7 |
Senior Member
Join Date: Apr 2005
Location: Joppa, Maryland
Posts: 4,408
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1997 GMC Sierra Ext 1965 Mustang |
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#8 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Napa has them.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#9 |
Registered User
Join Date: Jul 2005
Location: DFW
Posts: 463
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Thanks for the link, they have them!!!! Sweeeet!!! I'm so glad...now I can rewire the entire truck with all the add-on goodies for $100 (actually might be less than that!!).
You guys rock! -Chris |
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#10 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Steve, thanks for that link!
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads Last edited by 70c10; 08-15-2005 at 07:54 AM. |
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