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second.flood
Top Member
USA
640 Posts |
 Posted - 03/04/2009 : 3:56:42 PM
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1998 Thomas/International conventional.
AM mechanic opened the lot and saw a bus with the marker/running lights on. He entered the bus to turn off the lights, the light switch was off and there was the smell of hot/burnt wires. The blue wire #62 was hot to the headlight switch.
First correct guess of the cause or fix wins a prize!
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Mechan1c
Top Member
USA
853 Posts |
Posted - 03/04/2009 : 5:17:02 PM
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| Diode |
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second.flood
Top Member
USA
640 Posts |
Posted - 03/04/2009 : 6:22:55 PM
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quote:
Originally posted by Mechan1c
Diode
The lights stayed on even with the switch disconnected. |
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bwest
Administrator
United States
3820 Posts |
Posted - 03/04/2009 : 6:45:14 PM
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| Day time running light relay stuck on? |
Bryan |
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second.flood
Top Member
USA
640 Posts |
Posted - 03/04/2009 : 7:13:36 PM
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quote:
Originally posted by bwest
Day time running light relay stuck on?
The headlights weren't on... just marker/running lights.
No DRL, but good thought. |
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bwest
Administrator
United States
3820 Posts |
Posted - 03/04/2009 : 7:38:34 PM
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| This is good. Making me think. Don't give us the answer keep us guessing (thinking). |
Bryan |
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Bassman
Top Member
USA
558 Posts |
Posted - 03/05/2009 : 03:59:40 AM
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| Melted headlight switch connector allowing wires to touch. |
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second.flood
Top Member
USA
640 Posts |
Posted - 03/05/2009 : 04:35:37 AM
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quote:
Originally posted by Bassman
Melted headlight switch connector allowing wires to touch.
That would be too easy!  |
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bbird66
Top Member
USA
881 Posts |
Posted - 03/05/2009 : 05:36:14 AM
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| I've seen a lot of those headllight switches in the Int's go bad. Seems like their not built "heavy" enough... as are many other things in a bus.. prone to a lot of dirt, dust, .."greenie weenies" lol. |
Were gonna miss you "Brent"..Good luck in "Heidi land"
"I know you miss the Wainwrights Bobby, but they were weak and stupid people...and that's why we have wolves and other large predators" .. The Far Side
"On a two hour delay when will my child be picked up??"
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Harrison Fire
Senior Member
United States
175 Posts |
Posted - 03/05/2009 : 09:28:41 AM
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The wires to the "Master Switch" relay and switch stay hot always as does the drivers dome light switch, the warning light switch (on some) and lets not forget a 12 volt outlet for accessories. Rubbed through or barbecued these wires could energize the light circuit.
HF |
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Thomasbus24
Administrator
USA
4547 Posts |
Posted - 03/18/2009 : 2:46:02 PM
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Alright alright GIVE IT UP!!! Please tell us!
And I want the prize for the fix---just unhook the batteries and send it to the junkyard |
Edited by - Thomasbus24 on 03/18/2009 2:46:50 PM |
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IBTMech
Top Member
USA
973 Posts |
Posted - 03/18/2009 : 4:42:00 PM
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| After ruling out the headlight switch, I'd be inspecting the backside of the fuse panel to the left of the headlight switch for toasted wires and terminals and pulling related fuses. Next I'd be inspecting the main unswitched bus to that fuse panel for shorts. |
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years. |
Edited by - IBTMech on 03/18/2009 4:42:54 PM |
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thomasguy
Active Member
Canada
21 Posts |
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Thomasbus24
Administrator
USA
4547 Posts |
Posted - 04/26/2009 : 05:43:20 AM
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| Come on second.flood! What was up? |
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bwest
Administrator
United States
3820 Posts |
Posted - 04/26/2009 : 11:29:59 AM
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| I think he forgot about us!! |
Bryan |
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second.flood
Top Member
USA
640 Posts |
Posted - 04/26/2009 : 8:05:56 PM
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bwest, you said "This is good. Making me think. Don't give us the answer keep us guessing (thinking)."
Actually, I did forget.
I'll tell you soon.
Think dash... |
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Thomasbus24
Administrator
USA
4547 Posts |
Posted - 04/27/2009 : 1:38:13 PM
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| Ohh...yeah I never even considered the dash, but that's a good lead. Now time to attemt to remember what wire to the dash would be live full-time. hmmmm. |
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second.flood
Top Member
USA
640 Posts |
Posted - 04/30/2009 : 4:32:59 PM
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The ammeter circuit (#26) shorted to the dash light circuit (#62) in the left third printed circuit in the dash.
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Interesting Diagnosis...
