HELP!!! I need help identifying wires….

[Joeturtle]

I bought a 1989 C2500 5.7 liter 2WD 4 speed automatic. The previous owner tried to replace the horn with an aftermarket horn from auto zone. Now the wiring is all jacked up!!! I remove his “handy” work but now my truck doesn’t start!‍. I noticed how he didn’t it but don’t know why or what the wires he spliced into are.
Can someone please help me identify the wires? In the back right side of the engine bay there’s a bigger wiring harness, he cut the RED wire and white wire spliced them together and introduced a aftermarket, red wire, running along the back of the firewall to an aftermarket blue wire that was spliced into the alternator plug, and then runs under the dashboard which plugged in the fuse box.

My questions is what do the red and white wires do? And why won’t it start now?

 

[Erik the Awful]

You're going to have to dive into the manual.

ST-375-89-EDD_1989_T400_CK10-30_Chevrolet_Wiring_Manual

MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.

www.mediafire.com

 

[LTC_]

Those look just like the wires going to the throttle body. Having those cut would explain the no start. Not sure.what all the previous hackery involved though.

 

[Joeturtle]

Those look just like the wires going to the throttle body. Having those cut would explain the no start. Not sure.what all the previous hackery involved though.

You were 100% correct sir! Thank you so much, you just saved me so much money.

 

[LTC_]

You were 100% correct sir! Thank you so much, you just saved me so much money.

Glad to help in any way

 

[Dizz420]

You're going to have to dive into the manual.

ST-375-89-EDD_1989_T400_CK10-30_Chevrolet_Wiring_Manual

MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.

www.mediafire.com

do you have that maunal for the 99 suburban 5.7 i really neec it bad

 

[Schurkey]

do you have that maunal for the 99 suburban 5.7 i really neec it bad

Maybe it's in the thread with all the other links to .pdf manuals. If it's not listed in the first post, it may be listed in a later post.
www.gmt400.com/threads/88-98-service-manuals.43575/

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com