Advanced Design, where did you mount your ECM? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

50 Chevy LS3 · 01-19-2017, 03:05 PM

I'm in the process of laying out what holes I will need in the firewall, and where to mount my ECM, boxes. I have the F.A.S.T., controllers. Will also add the TCI trans. control for my 4L60E.
I'm thinking about putting everything under the original bench seat. The battery will remain in the original, under floor location. Then running the main harness underneath the cab and to the engine. F.A.S.T. says to run their supply and ground wires directly to the battery, and they already have fuses in line.
The rest of the trucks elec. system will be from a fuse box under the dash, and through the firewall, as original. I'm using American Autowire, Classic Update for that.
Any ideas or advise, appreciated.

**mongocanfly** · 01-19-2017, 03:54 PM

Absolutely you're on the right track...under or behind the seat..

65Gregg · 01-19-2017, 10:19 PM

Mines routed along the driver side frame rail, thru the floor to the back of the cab.

50 Chevy LS3 · 01-20-2017, 09:56 AM

OK, Thanks, guys. I was thinking about making a raised mounting platform to mount them flat about an inch off of the floor.
After laying out the main harness, it appears, running it along the right frame rail to near the starter would be best.
Then, possibly hide as much of the engine harness behind the fuel rails.

Anyone else have pictures?

solidaxel · 01-20-2017, 10:46 AM

Quote:

Originally Posted by 65Gregg

Mines routed along the driver side frame rail, thru the floor to the back of the cab.

How long is the "trunk-tail" from the back of the manifold to the ECM location where you have it mounted?
How many inches, feet did you add to the harness?

01-19-2017, 03:05 PM	#1
50 Chevy LS3 Registered User Join Date: Feb 2014 Location: Indiana Posts: 40	Advanced Design, where did you mount your ECM? I'm in the process of laying out what holes I will need in the firewall, and where to mount my ECM, boxes. I have the F.A.S.T., controllers. Will also add the TCI trans. control for my 4L60E. I'm thinking about putting everything under the original bench seat. The battery will remain in the original, under floor location. Then running the main harness underneath the cab and to the engine. F.A.S.T. says to run their supply and ground wires directly to the battery, and they already have fuses in line. The rest of the trucks elec. system will be from a fuse box under the dash, and through the firewall, as original. I'm using American Autowire, Classic Update for that. Any ideas or advise, appreciated. __________________ Steve. 1950 Chevy, 3100, built in Norwood Ohio, USA. My build thread, http://talk.classicparts.com/showthread.php?t=19110

01-19-2017, 03:54 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,592	Re: Advanced Design, where did you mount your ECM? Absolutely you're on the right track...under or behind the seat..

01-19-2017, 10:19 PM	#3
65Gregg Registered User Join Date: Jul 2006 Location: Willis, Texas Posts: 754	Re: Advanced Design, where did you mount your ECM? Mines routed along the driver side frame rail, thru the floor to the back of the cab. Attached Images __________________ 65Gregg Blue long bed White TBSS 61 Impala “The two most important days in your life are the day you are born and the day you find out why.” Mark Twain

01-20-2017, 09:56 AM	#4
50 Chevy LS3 Registered User Join Date: Feb 2014 Location: Indiana Posts: 40	Re: Advanced Design, where did you mount your ECM? OK, Thanks, guys. I was thinking about making a raised mounting platform to mount them flat about an inch off of the floor. After laying out the main harness, it appears, running it along the right frame rail to near the starter would be best. Then, possibly hide as much of the engine harness behind the fuel rails. Anyone else have pictures? __________________ Steve. 1950 Chevy, 3100, built in Norwood Ohio, USA. My build thread, http://talk.classicparts.com/showthread.php?t=19110



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