Reply
 
Thread Tools Display Modes
 
Old 02-11-2018, 10:46 AM   #1
Bus Geek
 
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
Interlocks - A slightly different question

Nope, I haven't pulled the wiring.

Yes, my bus still starts.

As I understand it, the usual interlocks should prevent the bus starting if the emergency doors are either locked, or open. The normal running condition being closed but unlocked.

Mine is behaving slightly differently, and I'm asking because I am at the point where I am removing all the wiring we will not need.

If I lock the emergency doors (A sliding bolt with a micro-switch), the buzzer(s) sound when I turn on the ignition. The same thing happens if I turn on the ignition with any of those doors open. So far, normal.

But here is the thing ... Neither condition prevents the engine starting, and it doesn't cut out when I select 1st gear.

That is ... the interlocks sound (loud) buzzers, but they do not seem to be tied to the ignition system.

Is this something people have come across before? It seems that I can simply remove all the switches, wiring and buzzers to no effect other than not getting warnings .... or I could leave it all in.
__________________
Steve Bracken

Build Thread
Twigg is offline   Reply With Quote
Old 02-11-2018, 10:59 AM   #2
Traveling
 
Join Date: Nov 2015
Location: Midwest
Posts: 2,573
Year: 2003
Coachwork: BlueBird
Chassis: TC2000
Engine: 5.9L Cummins
Rated Cap: '00
Subscribed.
Rusty is offline   Reply With Quote
Old 02-11-2018, 11:45 AM   #3
Bus Nut
 
Join Date: Jun 2016
Location: Orange County, CA
Posts: 832
Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
Was you bus originally a school bus or was it something else (a SPAB or a transit bus?) If it never was a school bus, maybe that's why you only have alarms and no interlocks? Mind you, my bus was a school bus, an it never had any interlocks, just some very strident alarms for the emergency door and window, so who knows? I guess the electrical schematic will tell you.

If your buzzers are only for an open door/window, why not keep them? It's not a bad thing to be reminded that something's open or unlocked before driving away.

John
Iceni John is offline   Reply With Quote
Old 02-11-2018, 12:08 PM   #4
Bus Geek
 
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
Quote:
Originally Posted by Iceni John View Post
Was you bus originally a school bus or was it something else (a SPAB or a transit bus?) If it never was a school bus, maybe that's why you only have alarms and no interlocks? Mind you, my bus was a school bus, an it never had any interlocks, just some very strident alarms for the emergency door and window, so who knows? I guess the electrical schematic will tell you.

If your buzzers are only for an open door/window, why not keep them? It's not a bad thing to be reminded that something's open or unlocked before driving away.

John
It was owned by a school district and used as an activity bus. It is yellow, has all the warning lights and stop sign, but the stop sign was fixed closed (they didn't use it).

It was traded by the district against a newer bus, and I bought it from the dealer via auction.

I could keep them, but I don't want buzzers when the doors are locked, only when they are open. Shorting the micro-switches should accomplish that.
__________________
Steve Bracken

Build Thread
Twigg is offline   Reply With Quote
Old 02-11-2018, 01:38 PM   #5
Bus Geek
 
o1marc's Avatar
 
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 7,198
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
Quote:
Originally Posted by Twigg View Post
It was owned by a school district and used as an activity bus. It is yellow, has all the warning lights and stop sign, but the stop sign was fixed closed (they didn't use it).

It was traded by the district against a newer bus, and I bought it from the dealer via auction.

I could keep them, but I don't want buzzers when the doors are locked, only when they are open. Shorting the micro-switches should accomplish that.
Technically activity buses are not allowed to be painted yellow or have the flashing lights and stop signs. Only buses used to transport students to school and back daily are to be painted yellow.
o1marc is offline   Reply With Quote
Old 02-11-2018, 01:42 PM   #6
Bus Geek
 
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
Quote:
Originally Posted by o1marc View Post
Technically activity buses are not allowed to be painted yellow or have the flashing lights and stop signs. Only buses used to transport students to school and back daily are to be painted yellow.
This just isn't true.

Vehicles that transport students from home to school MUST comply with federal regs.

There is NOTHING to stop those same buses being used for activities. The only buses exempt from the color and lighting regs are those that were never intended to run routes.

We do it all the time. We also have three buses that are vinyl wrapped with school colors and logo that are only used for trips. The Band often travels in regular route buses, and we have spare buses that are fully compliant yet they only run trips.
__________________
Steve Bracken

Build Thread
Twigg is offline   Reply With Quote
Old 02-11-2018, 01:54 PM   #7
Bus Geek
 
Robin97396's Avatar
 
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
My first bus interlock system was as you described. I got my framing hammer and followed the sound until I found the buzzer then adjusted the noise level with the hammer with a few indelicate taps.

That half an interlock system confused me too. I agree, I don't like to travel with the doors unlocked.
__________________
Robin
Nobody's Business
Robin97396 is offline   Reply With Quote
Old 02-11-2018, 02:02 PM   #8
Bus Geek
 
o1marc's Avatar
 
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 7,198
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
Quote:
Originally Posted by Twigg View Post
This just isn't true.

Vehicles that transport students from home to school MUST comply with federal regs.

There is NOTHING to stop those same buses being used for activities. The only buses exempt from the color and lighting regs are those that were never intended to run routes.

We do it all the time. We also have three buses that are vinyl wrapped with school colors and logo that are only used for trips. The Band often travels in regular route buses, and we have spare buses that are fully compliant yet they only run trips.
So you agree with me. Then it's a school bus used for activities also. If it is being purchased as a MFSAB, it must meet federal regs. except for the control lights and stop bars and sign and paint.
Just because your school system does something does not mean it is legal.
o1marc is offline   Reply With Quote
Old 02-11-2018, 02:18 PM   #9
Bus Geek
 
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
Quote:
Originally Posted by Robin97396 View Post
My first bus interlock system was as you described. I got my framing hammer and followed the sound until I found the buzzer then adjusted the noise level with the hammer with a few indelicate taps.

That half an interlock system confused me too. I agree, I don't like to travel with the doors unlocked.
Thanks Robin.

I think I'll re-wire to remove the switches on the locks, and leave the buzzers active on the "open door".

Either way, it looks like I am spared the "Help, my bus doesn't start and I don't know how to search the forum" post
__________________
Steve Bracken

Build Thread
Twigg is offline   Reply With Quote
Old 02-11-2018, 02:47 PM   #10
Bus Geek
 
Robin97396's Avatar
 
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
Steve, that is completely lacking the excitement of our usual interlock issues.
__________________
Robin
Nobody's Business
Robin97396 is offline   Reply With Quote
Reply

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 11:17 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.