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#226 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
My wiring harness for the LS is just a birds nest of extra wire. I have the ECU mounted under the dash being the glove box. I put the cab back on the chassis and made a bracket that comes off the back of the motor and in through the firewall to the ECU. This gives me the exact location where the harness plugs in. With that done I pulled the cab off. I pulled each wire out of the plug, back through the birds nest to its source, rerouted it the way I wanted back to the plug, cut it to length and crimped a new pin on it. Just have to get some braided loom to dress it up and protect it now.
[IMG] ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() I think I am going to run all the power wires to a relay/fuse box under the hood |
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#227 |
Moderator
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Location: China Spring, TX
Posts: 7,280
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Re: 66 GMC Long to Short LS Swap
Now that's pretty ingenious. Should work out better than most.
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#228 |
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Join Date: Aug 2020
Location: Braunschweig, Lower Saxony, Germany
Posts: 782
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Re: 66 GMC Long to Short LS Swap
I agree, damn clever.
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------------------------------------------- Greetings Harald My 62 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=829782 |
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#229 |
I'm just glad to be here!
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
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Re: 66 GMC Long to Short LS Swap
Great idea. I'm going to have to use that someday.
__________________
Karl ![]() 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square |
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#230 |
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Join Date: Jul 2016
Location: West Kelowna, BC, Canada
Posts: 204
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Re: 66 GMC Long to Short LS Swap
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#231 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
I keep walking away and working on other things after every failed attempt. I have a big collection of doors now. I feel like I will have the whole truck complete and still be working on getting door skins on!
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#232 |
Moderator
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Location: China Spring, TX
Posts: 7,280
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Re: 66 GMC Long to Short LS Swap
Ya but when your done you'll be the best door fixer upper around.
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__________________
Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#233 |
Registered User
Join Date: Aug 2020
Location: Braunschweig, Lower Saxony, Germany
Posts: 782
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Re: 66 GMC Long to Short LS Swap
On my '62, I changed the entire door skin and the bottom on both doors, it's a challenge until all the gaps in the Cap fit again.
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------------------------------------------- Greetings Harald My 62 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=829782 |
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#234 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
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#235 |
I'm just glad to be here!
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
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Re: 66 GMC Long to Short LS Swap
Harness and the undercoating on the inner fenders and firewall look great. Nice progress.
__________________
Karl ![]() 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square |
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#236 |
Registered User
Join Date: Aug 2020
Location: Braunschweig, Lower Saxony, Germany
Posts: 782
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Re: 66 GMC Long to Short LS Swap
Looks great.
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------------------------------------------- Greetings Harald My 62 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=829782 |
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#237 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
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#238 |
Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,228
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Re: 66 GMC Long to Short LS Swap
I like the white hoop wheels
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, boosted-LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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#239 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
I got the seals installed on the inner fenders. I used stainless safety wire and bent them into staples, worked pretty well.
![]() ![]() ![]() Got to do some final assembly with freshly painted parts. Bolted up the inner fenders, core support, and the battery tray. Installed the radiator and battery. With the inner fenders in I now had a place to put a waterproof fuse/relay box. I wired up all the power for the motor and ecu, as well as the fan. Also built a bracket to house a fuse block on the fire wall inside the cab. It sits right on top of the Tac Module for the drive by wire. ![]() ![]() ![]() ![]() ![]() Wired power to the ignition switch and turned the key, engine would crank but not start. Spent 2 days trouble shooting only to find out that the "acc" terminal on the ignition switch that I used to signal the main power relay loses power when you turn the key to crank the starter. Switched the signal wire over to the ignition terminal and it fired right up. I wired up the OBD2 port so I could hook up my laptop with HPTuners to monitor oil pressure and coolant temp. I let the motor run until it hit 108 degrees celsius to confirm the ecu would trigger the fan relay. It takes a long time for it to hit 108! Fan kicked in, so all engine wiring is now complete. Still need to run some heavier ground and power cables from the battery. |
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#240 |
chevy truck fan
Join Date: Mar 2005
Location: Gilbert, arizona 85298
Posts: 1,989
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Re: 66 GMC Long to Short LS Swap
very nice!!... wiring looks really good, you indicated that you wired up the OBD2 port? I am in the process of getting mine dialed in (obd2 port) and in need of adding a 120ohm resistor... did you have to do this? if so, would you be willing to elaborate on the process (steps) that you did??...
really nice build! |
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#241 | |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
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#242 |
chevy truck fan
Join Date: Mar 2005
Location: Gilbert, arizona 85298
Posts: 1,989
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Re: 66 GMC Long to Short LS Swap
hhmmm..ok... I just added a 120ohm resistor to my OBD2 port end. It was a bit nerve racking as those data wires are pretty delicate! ..LOL! I get a good ohm range now: 62.3-62.5 at the port. the god thing is now my DD das BIM appears to be working (communicating with ECM) now!
by chance did you do anything related to your pedal wires? |
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#243 | |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
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#244 |
chevy truck fan
Join Date: Mar 2005
Location: Gilbert, arizona 85298
Posts: 1,989
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Re: 66 GMC Long to Short LS Swap
duncan, thank you for the reply, I am wondering if you have a "plan of attack" related to the pedal wires? I swapped a '13 into my '86 and have used all the factory harness & connector(s) IE: X109 connector which includes the pedal wires. I am curious to see what others are doing related to the pedal wires.
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#245 | |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
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#246 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
I re-sprayed the interior after getting the colour tweaked a bit. Painted the glove box lid, heater control, ash tray and the steering column at the same time. Painted the pedal assemblies, e brake handle and a pile of other small parts as well. Got everything installed in the interior.
![]() ![]() ![]() Under the hood I got the steering, brakes and transmission linkage reassembled with all the newly painted bits. Bolted up the hood hinges as well. ![]() ![]() Made up a spring stretcher so I could sandblast and paint the hood hinge springs ![]() ![]() |
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#247 |
chevy truck fan
Join Date: Mar 2005
Location: Gilbert, arizona 85298
Posts: 1,989
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Re: 66 GMC Long to Short LS Swap
duncan, thanks for the reply. your routing and tideness looks very nice! wondering... so are your pedal wires continuous from the ECM to the tac/pedal conn.? when you lengthened them did you use same gauge and color or ???
thank you again for your time ![]() |
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#248 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Yes, they are continuos. I used the same gauge wire, but all one colour, spliced right in the middle of the harness
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#249 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Its been ridiculously cold here the last week which makes staying warm in the shop very inviting. Got some time to do a little machining project. Made some brake line clamps out of aluminum. Had to replace a leaky T fitting on the back axle for the rear brake lines. Secured the lines down the frame rail with the new brackets and got everything bled.
![]() ![]() ![]() ![]() ![]() ![]() My front passenger fender had a big long flat spot all the way down the top of the front half. My hammer and dolly skills aren't that great yet so I decided it would be easier to just replace the damaged section. I found a fender with a good front half, chopped them up and made to into one. ![]() ![]() |
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#250 |
chevy truck fan
Join Date: Mar 2005
Location: Gilbert, arizona 85298
Posts: 1,989
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Re: 66 GMC Long to Short LS Swap
nice job!!! good progress
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