Thread Tools Display Modes
Old 11-22-2017, 05:35 PM   #1
Here to learn's Avatar
Join Date: Oct 2017
Location: Northeast
Posts: 38
Year: 1999
Coachwork: Amtran
Chassis: 3800
Engine: dt466
1999 International 3800 wiring Diagram for Interlock

Hello All, First post. I am just starting my conversion. I studied for quite some time before attempting this but still screwed something up with the interlock. I did get ahead of myself removing wires and now have to remove the interlock to get it to run again.

Does anyone have a wiring diagram for a 1999 navistar international 3800? (not that it matters but it has a dt466.

I tried following the instructions at and found the relay or solonoid or whatever you would like to call it. On my bus, I have two pink wires coming off the rear panel with the emergency exit. The bar lock is connected with two pink wires designated as 58 and 5 and the slide lock is connected by two pink wires 75 and 5. the pink wire #5 i had left alone and is one of the three pink wires running to the buzzer. #75 runs up the wall and ends in a single connector that does not run anywhere. As far as i know i did not remove this wire as i saved every wire i removed and i dont have it and it also does not appear at the wiring box. Now for the craziness....

#58 is one that i did cut but had the wire and reconnected it. It runs to the front to the relay or solonoid. Attached image 0124. I tried replacing that wire with a ground wire like here and it still didnt work. I removed the wires from both sides of the relay, held them together and grounded them against a bolt and it cranked finally but did not turn over. It has only been sitting for less than a week. Batteries are fully charged. I connected the wires again to the relay and reconnected the wire to the rear, and nothing. Tried grounding again and still nothing.

Also another crazy issue is my batteries died after i parked it and while i was removing stuff. Probably left the rear door open too long or something. I charged them and when i attach them to the bus, as soon as i put the power wires on and beeping starts going off even with the key not in. Any ideas?

I looked at the buzzer and on one side there are three pink wires going to the emergency windows, the escape hatch and the rear door. On the other side are three black wires, one disappearing into the mess under the dash, the other connecting to the radio harness and the last as the middle wire on a second relay / solonoid. The wires on either side of that are going to the base of each fuse block. Should that wire also be removed and i attempt to ground that relay as well?

Any help would be greatly appreciated. God Bless, Clint
Attached Images
File Type: jpg IMG_0124.JPG (113.7 KB, 8 views)
File Type: jpg IMG_0125.jpg (235.7 KB, 9 views)
File Type: jpg IMG_0128.jpg (127.5 KB, 8 views)
File Type: jpg IMG_0130.jpg (196.2 KB, 8 views)
File Type: jpg IMG_0131.jpg (224.0 KB, 9 views)
Here to learn is offline   Reply With Quote
Old 08-13-2019, 06:54 PM   #2
New Member
Join Date: Jul 2019
Posts: 1
Same issue

My husband and I are having the same problems on our 92 International. Did you resolve it?
Greenbetty is offline   Reply With Quote

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 01:18 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.