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11-10-2025, 11:25 AM
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#1 |
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Registered User
Join Date: May 2011
Location: Boise, ID
Posts: 95
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engine harness firewall pass through
looking for some ideas for a clean inconspicuous passthrough for ECM harness, hopefully mounting under the seat.
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11-10-2025, 03:09 PM
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#2 |
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Senior Member
 
Join Date: Dec 1999
Location: TX
Posts: 1,787
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Re: engine harness firewall pass through
Go through the floor under the seat. That is what I have done on 2 ls swaps...
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11-10-2025, 05:11 PM
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#3 | |
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Registered User
Join Date: May 2011
Location: Boise, ID
Posts: 95
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Re: engine harness firewall pass through
Quote:
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11-10-2025, 09:27 PM
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#4 |
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Registered User
Join Date: May 2011
Location: Long Island NY
Posts: 835
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Re: engine harness firewall pass through
Whose harness are you using? Terminator or something else? Did you need to get it extended to reach under the seat?
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11-11-2025, 11:38 AM
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#5 |
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Registered User
Join Date: May 2011
Location: Boise, ID
Posts: 95
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Re: engine harness firewall pass through
the supplied holley harness, it seems like it will be long enough
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11-11-2025, 05:16 PM
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#6 |
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Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,592
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Re: engine harness firewall pass through
I enjoy hiding wires. On my 68 C10 project I went thru the firewall just low enough to get it under the stock non-AC heater box.
I used a Howell engine/trans harness and GM ECM for a 2002 LS6. Couple of pics. |
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11-11-2025, 09:59 PM
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#7 | |
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Senior Member
Join Date: Nov 2015
Location: Pine City MN
Posts: 431
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Re: engine harness firewall pass through
Quote:
__________________
72 C10, Was a 350,M20, Brodix heads,Comp cam, Edelbrock intake&carb, Hedman hedders LWB. Project is now a 5.3(L33) w/PRC stage 2.5 CNC ported 243heads, FAST 102/102, FIC injectors,BTR RedHot cam,Holley Terminator X, T56 magnum. SWB, Boyd tank. 4.5/4 Drop http://67-72chevytrucks.com/vboard/s...My72c10project |
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11-12-2025, 04:31 PM
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#8 | |
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Registered User
Join Date: May 2011
Location: Boise, ID
Posts: 95
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Re: engine harness firewall pass through
Quote:
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