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Old 03-12-2017, 08:44 AM   #1
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International 3800 wiring nightmares

I know- I have several threads, but I'm desperate.
I've pulled EVERY fuse I can find and CANNOT get the right widow wiper to stop. Does anyone know ANYTHING about how to get the wiper to not run the entire time the bus is running?
I've got a TON of folks wanting to buy this thing, and it starts this BS.
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Old 03-12-2017, 08:47 AM   #2
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cut the wire going to the right wiper and connect it to the left wiper so they work off one switch
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Old 03-12-2017, 08:48 AM   #3
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They're on one switch, it has two knobs.
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Old 03-12-2017, 08:56 AM   #4
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when do you have "showings?" im planning to drive back to florida tonight / tomorrow.. I can bring my meter and such with me ..

do your wipers have auto return? meaning when you turn the wipers off do they stop in the middle of the windshield or do they stop at the bottom? (when they work right)..

auto return used to beat my ass on old GM cars.. sometimes i could rap on the side of the motor assembly with a wrench head and it would disengage the cam that forced the motor to run until the wiper hit bottom..
on others its a switch that sticks.. in the motor assembly
-Christopher
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Old 03-12-2017, 09:03 AM   #5
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when do you have "showings?" im planning to drive back to florida tonight / tomorrow.. I can bring my meter and such with me ..

do your wipers have auto return? meaning when you turn the wipers off do they stop in the middle of the windshield or do they stop at the bottom? (when they work right)..

auto return used to beat my ass on old GM cars.. sometimes i could rap on the side of the motor assembly with a wrench head and it would disengage the cam that forced the motor to run until the wiper hit bottom..
on others its a switch that sticks.. in the motor assembly
-Christopher
I've got three guys coming today (supposedly) one weds, and one friday.
The wipers are self-returning. They worked 100% fine until the day the CC, Radio, and wipers started to act crazy. Sometimes the radio works, others it wont.
The only constant now is that the right wiper goes full blast if the engine is running. The left one comes on if I touch either wiper knob, also, but it will stop after a few wipes. The right side is going apeshit all the time.
Is there some computer thing that senses we've "entered" it without authorization or something?
If I'd known enabling CC could possibly affect any of this I'd have not worried with it. Maybe its not that at all.
I'm an idiot for buying this thing.
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Old 03-12-2017, 09:41 AM   #6
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wipers

Sounds like it could be a stuck wiper relay.
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Old 03-12-2017, 09:45 AM   #7
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Sounds like it could be a stuck wiper relay.
Ok, thanks man. What do I do? replace it? hit it with a hammer?
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Old 03-12-2017, 09:56 AM   #8
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Ok, thanks man. What do I do? replace it? hit it with a hammer?


The hammer is an important diagnostics tool.




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Old 03-12-2017, 10:07 AM   #9
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Anyone know where that relay is? I'm looking...
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Old 03-12-2017, 10:08 AM   #10
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Look for the obvious first. Like remove the switch and check its connections. Then take an ohmeter and ring the switch out without any wires attached to see if it works properly. Maybe it is fed with a breaker if you can't find a fuse for it.
Isn't troubleshooting a blast?
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Old 03-12-2017, 10:10 AM   #11
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After reading through the School Bus Fleet forums, the "Body Controller" is often the culprit in this situation. Anyone know where that is?
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Old 03-12-2017, 10:21 AM   #12
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After reading through the School Bus Fleet forums, the "Body Controller" is often the culprit in this situation. Anyone know where that is?
That sounds a lot like blinker fluid to me.
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Old 03-12-2017, 10:25 AM   #13
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Roxy's telling me to just pull the CL ad, drive it to the dealer, spend a ton of $$, paint it, and OWN it. She's saying we could always relist it for even more money since we're already getting so many inquiries and offers already.
Maybe I could see about that service shop in Summerfield that's owned by that new member here.
Chris- if you can find any time in the next week or two, I'd much rather give you the money than the dealer.
I gotta get ALL the school specific junk out of it, and get rid of anything not necessary.
IDK. Kinda thinking out loud on all this, I guess I'm stressed a bit.
I'm gonna go ROLL MY OWN, and go deal with my roof raise project a bit.
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Old 03-12-2017, 10:27 AM   #14
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That sounds a lot like blinker fluid to me.
IDK, there's a "body control unit" computer thingy in this bus.
I'm starting to find out that bus wipers doing this is way more common than one would think.

If yall wanna paint that bus of yours sometime in the next day or so, that would make for a nice, fun diversion.
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Old 03-12-2017, 10:42 AM   #15
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dude calm down a bit first... take a break.. you can wave off the guy to look at it for today.. "I had to work" suffices.. call him..

dont spend big $$ at a dealer.. whats your schedule this week? lets see if we can trace it out and knock it down..

I dont think that bus is new enough to have a BCM..

im heading back to florida from ohio.. ill bring my meter..
-Christopher
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Old 03-12-2017, 01:27 PM   #16
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dude calm down a bit first... take a break.. you can wave off the guy to look at it for today.. "I had to work" suffices.. call him..

dont spend big $$ at a dealer.. whats your schedule this week? lets see if we can trace it out and knock it down..

I dont think that bus is new enough to have a BCM..

im heading back to florida from ohio.. ill bring my meter..
-Christopher
I borrowed a multimeter. I'm fairly clueless as to how to really use it much, but I'm calm man.
I've emailed the guy and told him I can't do it today.
I'm still not 100% sure I want to part with the bus. I'm sorry if I get frustrated, electronics are something I'm totally not good with.
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Old 03-12-2017, 03:09 PM   #17
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More info-
I pulled the dash panel back off, and there are two individual wiper switches.
The Right side is the one that's having the issues. Intermittent never worked and that side never parks all the way down.
How do I test this switch? Go easy on me, I'm admitting full ignorance up front when dealing with any of this.
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Old 03-12-2017, 04:23 PM   #18
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took the right side wiper switch off the panel, and took the wiper motor apart, everything looks new, no signs of any corrosion anywhere. The right side switch works perfectly in the "acc" position. Its only when the engine is running that the right wiper comes on.
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Old 03-12-2017, 04:39 PM   #19
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dude calm down a bit first... take a break.. you can wave off the guy to look at it for today.. "I had to work" suffices.. call him..

dont spend big $$ at a dealer.. whats your schedule this week? lets see if we can trace it out and knock it down..

I dont think that bus is new enough to have a BCM..

im heading back to florida from ohio.. ill bring my meter..
-Christopher
I work wed-fri 7-2. That's all my obligations for the entire week.

I can't find anything that looks like any damage to any of the wiring running to the wiper motor, both switches seem to be fine unless its running.
If anyone has any suggestions of what to check, I'm all ears. IDK what's what but every wire I follow seems a-ok.
There's a relay or something like that under the hood on the top of the firewall, it say module control relay or something like that. Is that something to look into?
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Old 03-12-2017, 08:46 PM   #20
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can you unplug the wipers at the switches and switch the wires to the opposite switch?
I am thinking if you can do that, then you can confirm if the problem is in the switch or elsewhere such as the motor itself or the wiring to that motor.
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