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Old 04-19-2019, 11:27 PM   #1
Mini-Skoolie
 
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Headlights stay on all the time. 1998 International/Thomas 3800

My headlights stay on all the time now. A while back, the headlights would flicker or turn on at random (while parked-ignition switch off).
I now have to disconnect the battery cable to kill the lights. I'm assuming a relay has gone bad somewhere, but I don't know which relay to check.
Does anyone have a wiring diagram and/or recommendations on where to start looking?
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Old 04-20-2019, 01:08 AM   #2
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I can't remember if there is a relay, or the power just goes through the switch. Also, does your bus have automatic daytime headlights? That module could be responsible too. Mine has/had the ADRL (I pulled the fuse for it).
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Old 04-20-2019, 02:00 AM   #3
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Yes, it has either the ADRL or just a constant on when you turn the ignition switch to run (not sure if there is a difference).

Where would I find the module and the fuse? Do you have a pic of the fuse panel schematic?

I pulled the connectors off the back of the ignition switch and the lights stayed on. I pulled the connectors off of the headlight switch and the lights stayed on.

The headlight switch is the push-pull type with dimmer.
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Old 04-20-2019, 09:02 AM   #4
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I really think it is a relay somewhere, but I can't tell you where...
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Old 04-20-2019, 09:45 AM   #5
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A faulty dimmer will cause this condition. pretty sure no relay is involved in headlight circuitry.


Not an easy fix if dimmer is on the steering wheel.



Good luck.


John
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Old 04-20-2019, 10:11 AM   #6
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The daytime running lights in my bus use a relay, methinks.... But mine's a BlueBird.
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Old 04-20-2019, 10:40 AM   #7
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Quote:
Originally Posted by JBird152 View Post
Yes, it has either the ADRL or just a constant on when you turn the ignition switch to run (not sure if there is a difference).

Where would I find the module and the fuse? Do you have a pic of the fuse panel schematic?

I pulled the connectors off the back of the ignition switch and the lights stayed on. I pulled the connectors off of the headlight switch and the lights stayed on.

The headlight switch is the push-pull type with dimmer.

My IH/BlueBird has a similar headlight switch. The ignition switch isn't (as far as I am aware) tied to the headlights, but the fact that you disconnected the headlight switch and still had lights helps me a lot.


I'm not sure where the ADRL module is but I remember there was a fuse for mine (which I pulled). I'd like to remove my ADRL module, since pulling the fuse seems to have caused my parking brake indicator to stop working (the bulb has been checked and replaced). I'm not sure where it is, though, or what it looks like. Anyone?


Quote:
Originally Posted by BlackJohn View Post
A faulty dimmer will cause this condition. pretty sure no relay is involved in headlight circuitry.


Not an easy fix if dimmer is on the steering wheel.

The dimmer has to be getting voltage from somewhere. If the headlight switch is off, then I'm not sure where it would be getting voltage from.


Quote:
Originally Posted by Mountain Gnome View Post
The daytime running lights in my bus use a relay, methinks.... But mine's a BlueBird.

Uses a relay, likely, but where's the ADRL module? I'd like to remove mine and restore function to the parking brake light.
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Old 04-20-2019, 12:11 PM   #8
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Quote:
Originally Posted by BlackJohn View Post
A faulty dimmer will cause this condition. pretty sure no relay is involved in headlight circuitry.


Not an easy fix if dimmer is on the steering wheel.



Good luck.


John



So there is no misunderstanding, my wording wasn't the best, sorry.


I had said dimmer switch when in reality it should be the hi-lo beam selector switch. Can be on the floor or steering column that is why I mentioned it is a tough job on the column.


Gnomer, hear ya on the DLR's but think the circuits aren't connected at all off the top of my head, no diagram to prove it unless someone else can post one.


Happy 420


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Old 04-20-2019, 12:24 PM   #9
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A thomas I'm looking after did that. The DRL module was bad. Disconnected it.
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Old 04-20-2019, 12:26 PM   #10
Mini-Skoolie
 
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Quote:
Originally Posted by BlackJohn View Post
So there is no misunderstanding, my wording wasn't the best, sorry.


I had said dimmer switch when in reality it should be the hi-lo beam selector switch. Can be on the floor or steering column that is why I mentioned it is a tough job on the column.


Gnomer, hear ya on the DLR's but think the circuits aren't connected at all off the top of my head, no diagram to prove it unless someone else can post one.


Happy 420


John
John,

Thanks for the clarification. The hi-lo selector is on the column. The selector switch still turns the high beams on and off.
Are you saying that the switch may have failed on the low side and could be causing the issue?
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