The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain > LSx Swaps

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 10-08-2020, 09:25 AM   #26
ewoody625
Registered User
 
ewoody625's Avatar
 
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
Re: 4L60E Trans only shifts 2 and 3

Quote:
Originally Posted by ls1nova71 View Post
OK, so now we're getting somewhere. Do you have 12v on both sides of that fuse? I would think you wouldn't since you did a continuity test on the wire. If you do have power there, then you almost have to have a break in that wire somewhere between the fuse and the trans plug. It's possible that by moving the wires around to test them, it's making contact again however. Have you tried to drive it again? If the short is intermittent, then your best bet is going to be to replace the wire from the fuse to the trans plug since finding the short in the harness with it in the truck will be pretty difficult.
I have half of the wiring out/disconnected. I'll continue to trace the wire back and see which one it is. There are 4 pink wires going to that 10a fuse. I will also check to see how many volts I have there at the fuse.
__________________
Eric

70 CST10 long bed in pieces also factory air and cruise(the project)

18 Silverado crew cab 5.3 4x4

My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166
ewoody625 is offline   Reply With Quote
Old 10-08-2020, 02:35 PM   #27
ewoody625
Registered User
 
ewoody625's Avatar
 
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
Re: 4L60E Trans only shifts 2 and 3

I have 12.6 volts on the left side of the fuse and 0 on the right.
__________________
Eric

70 CST10 long bed in pieces also factory air and cruise(the project)

18 Silverado crew cab 5.3 4x4

My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166
ewoody625 is offline   Reply With Quote
Old 10-08-2020, 03:51 PM   #28
ewoody625
Registered User
 
ewoody625's Avatar
 
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
Re: 4L60E Trans only shifts 2 and 3

I'm still tracing this pink pin E wire but I've gone past where they split off to go to the fuse block. So this wire has to go to the ecm. It goes to pin 63 on the green ecm plug.
__________________
Eric

70 CST10 long bed in pieces also factory air and cruise(the project)

18 Silverado crew cab 5.3 4x4

My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166

Last edited by ewoody625; 10-08-2020 at 04:08 PM.
ewoody625 is offline   Reply With Quote
Old 10-08-2020, 06:15 PM   #29
ls1nova71
Registered User
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,117
Re: 4L60E Trans only shifts 2 and 3

Quote:
Originally Posted by ewoody625 View Post
I have 12.6 volts on the left side of the fuse and 0 on the right.
You've found your problem right there. If you have power on one side of the fuse but not the other, then either the fuse is blown or its not making a good contact in the fusebox. Fix that and you should be good to go.
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 10-08-2020, 06:34 PM   #30
ewoody625
Registered User
 
ewoody625's Avatar
 
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
Re: 4L60E Trans only shifts 2 and 3

Quote:
Originally Posted by ls1nova71 View Post
You've found your problem right there. If you have power on one side of the fuse but not the other, then either the fuse is blown or its not making a good contact in the fusebox. Fix that and you should be good to go.
Wow.... I feel like an idiot lol. It looked good when I checked it before. I just looked at it again and it's blown. Well now I need to replace that fuse and get everything hooked back up and see if I'm back in business. Thanks for guiding me along.
__________________
Eric

70 CST10 long bed in pieces also factory air and cruise(the project)

18 Silverado crew cab 5.3 4x4

My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166
ewoody625 is offline   Reply With Quote
Old 10-08-2020, 06:38 PM   #31
ls1nova71
Registered User
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,117
Re: 4L60E Trans only shifts 2 and 3

Quote:
Originally Posted by ewoody625 View Post
Wow.... I feel like an idiot lol. It looked good when I checked it before. I just looked at it again and it's blown. Well now I need to replace that fuse and get everything hooked back up and see if I'm back in business. Thanks for guiding me along.
If you have the harness out, Double check it for any bare wires. You need to find the cause of the blown fuse.
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 10-09-2020, 08:24 PM   #32
ewoody625
Registered User
 
ewoody625's Avatar
 
Join Date: Jan 2009
Location: valparaiso,in
Posts: 730
Re: 4L60E Trans only shifts 2 and 3

It's shifting now. I still have a flashing check engine light but no codes. I'll have to keep an eye on that. Thanks for the help!
__________________
Eric

70 CST10 long bed in pieces also factory air and cruise(the project)

18 Silverado crew cab 5.3 4x4

My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=402166
ewoody625 is offline   Reply With Quote
Old 11-19-2020, 03:11 PM   #33
Duck1
Registered User
 
Join Date: Dec 2018
Location: San Bernardino
Posts: 71
Re: 4L60E Trans only shifts 2 and 3

Quote:
Originally Posted by ewoody625 View Post
I have 10.6v at the pink wire on the big round trans plug. That is what I am currently tracing back to see where my voltage drop is coming from. I do not have the tcc wire hooked up, I was told that is optional. To clarify, the tcc gets power from the brake switch? Or it goes to the brake switch and to a power source? I'm at the end of my rope on this. Ready to pull it all out and put my 350 back in. I appreciate the information.
And spend money on a drive shaft. Worst gas mileage. Instead of fixing the problems
Duck1 is offline   Reply With Quote
Old 11-19-2020, 07:10 PM   #34
ls1nova71
Registered User
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,117
Re: 4L60E Trans only shifts 2 and 3

Quote:
Originally Posted by Duck1 View Post
And spend money on a drive shaft. Worst gas mileage. Instead of fixing the problems
????
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:32 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com