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Old 11-23-2022, 06:26 PM   #1
62c30
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Join Date: Jan 2017
Location: Derby Kansas
Posts: 203
LS firewall harness routing

I'm doing a clean up on my 61 firewall and am looking for a stock cleaned up look not a custom look. I have already filled in multiple holes and drilled a new hole for the chassis wiring harness and am wanting to put the hole in for the engine harness. I have a stock truck 5.3 with a BP swap harness. The cab isn't on the frame and the frame is at another location. I am wanting to put the computer under the seat. Anyone have any pictures on where they ran the harness through the firewall?
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Old 11-23-2022, 11:28 PM   #2
norcalcap
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Join Date: Apr 2018
Location: NorCal
Posts: 45
Re: LS firewall harness routing

For me, this seamed like the most natural spot as all the wires in my harness came together at the rear passenger side of the motor. FWIW, I installed the comp under the dash, to the right of the column.
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Old 11-24-2022, 11:34 AM   #3
MT65
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Join Date: Sep 2020
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Re: LS firewall harness routing

Mounted my ecu on back of the cab, wire bundle under cab to back of the engine….
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Old 11-24-2022, 11:57 AM   #4
62c30
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Re: LS firewall harness routing

Thanks for the replies. The back wall would be a good place to mount if I have enough length, I think the harness extends 4' from the back of the intake.
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Old 11-24-2022, 12:29 PM   #5
MT65
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Re: LS firewall harness routing

Quote:
Originally Posted by 62c30 View Post
Thanks for the replies. The back wall would be a good place to mount if I have enough length, I think the harness extends 4' from the back of the intake.
That’s the usual length, had my “custom “ built, most all the harness guys don’t want a special order…if I remember correctly my head length is 6’
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