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Old 09-09-2022, 05:32 PM   #1
Mini-Skoolie
 
Join Date: Sep 2020
Location: Paragon, IN
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Year: 2005
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Chassis: Saf-T-Liner HDX
Engine: CAT7
Rated Cap: 56
Turn Signal Issues - 2005 Thomas HDX

Howdy everyone,

I've been having issues with my turn signal and need some troubleshooting help (or some schematics). My bus is a 2005 Thomas Saf-T-Liner HDX.

The right turn signal works. Hazards work. Left turn signal...does not work.

I've replaced the turn signal switch and it did not fix the issue (of course it must be something more complicated).

Below are the voltages I'm getting at the turn signal switch:

YEL BLU RED ORN GRN
Hazards
0 0-12 0-12 0-12 0-12
Right
0 0-12 0 0.03 0-12
Left
12 0 0 0.03 0


On the main harness, I have three wires with 0.03, 12, and 0 V.

I don't have any bad fuses from what I can tell. Maybe I should check relays, but I am unsure which ones I should replace.

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Old 09-09-2022, 06:04 PM   #2
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are your lights grounded by the screws holding them on or do you have a return ground wire?
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Old 09-10-2022, 04:38 PM   #3
Mini-Skoolie
 
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Engine: CAT7
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Not the lights

Quote:
Originally Posted by Jolly Roger bus 223 View Post
are your lights grounded by the screws holding them on or do you have a return ground wire?
I don't think it is an issue with the lights grounding because the hazard lights work for both the left and right sides. That is why I was thinking it was the switch and replaced it.

Perhaps it is a relay or something? I can't find schematics or electrical drawings for the turn signal/hazards, so I don't know what to replace/fix next.
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Old 09-11-2022, 07:12 AM   #4
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https://drive.google.com/file/d/132c...w?usp=drivesdk

This is for my 2001 HDX.
might help.

Dave
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Old 09-11-2022, 02:58 PM   #5
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Quote:
Originally Posted by Meathead View Post
https://drive.google.com/file/d/132c...w?usp=drivesdk

This is for my 2001 HDX.
might help.

Dave
I posted some Thomas manuals over in THIS THREAD, hope you find what you need there!

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Old 09-11-2022, 02:59 PM   #6
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Quote:
Originally Posted by sealguy77 View Post
I don't think it is an issue with the lights grounding because the hazard lights work for both the left and right sides. That is why I was thinking it was the switch and replaced it.

Perhaps it is a relay or something? I can't find schematics or electrical drawings for the turn signal/hazards, so I don't know what to replace/fix next.
Loose and/or rusted connections can cause voltage fluctuations.
I would also check the light sockets for rust/corrosions and also the grounding points for each light too!
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Old 09-11-2022, 03:21 PM   #7
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ewo1.
where do you find your manuals at?
i know i am not that good with a computer?
i am not needing bus specific stuff but stuff for work likee old boilers and chillers and steam equipment and i always have to wade through all the manuals lib. and all manuals stuff when the manufacturer doesnt support there stuff anymore?
do you have a secret spot or i just have to figure it out?
it is raining here so no bus stuff so i was looking into an old boiler i have to work on tomorrow and the manufacturer or whoever only has the owners manual not the install or troubleshoot manual and a phone call revealed that there engineers that knew this model have aged out and now i get young engineers that dont know this model?
i can work on most old ones with no problems but someone before me has played with all kinds of things and i am almost suprised that it is still running?
now i have been hired to make it run efficiently with half the safety switch wiring cut loose and at least they didnt get rid of the releif valve but the idiot/whoever did put a valve in it because it kept leaking? on a steam boiler?
already know its not burning correct? have been told it was converted to natural gas from fuel oils 6-years ago. friday i found the orifice and springs were never changed?
air mixture aint right?
my company got called because the owners were tired of smelling gas in there business
and there maintenance man says i have been taken care of this and i didnt know they called you?
now the owner says the maitenance man needs to stay away and dont talk to him?
i will call BS on that all day.
there man needs to be there to know what in the hell it takes to make this one right that way he knows where his maintenance is lacking.
sorry stuff in my head for tomorrow?
another week ahead.
didnt meen to hijack athread.
hope everyone is safe at work this week.
and i will never forget 9/11/01 OOHRAH.
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Old 09-11-2022, 04:47 PM   #8
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Quote:
Originally Posted by Jolly Roger bus 223 View Post
ewo1.
where do you find your manuals at?
i know i am not that good with a computer?
.....
do you have a secret spot or i just have to figure it out?
.
In my previous profession I had to do alot of investigative type of work, people, info...etc...
I was lucky enough to attend a couple of OSINT classes which basically teaches you how to find what they call "actionable intelligence" which is nothing more that cookie crumbs that when you collect enough of them it begins to paint some sort of picture. The picture I try to create is what i call a "Path". once you have a path believe it or not information just starts jumping out at you!

When you search on google, it all about how to play with the words. Yes you can ask google =- service manual for xyz widget" and google will then spit some results.
I look at those results and then I try to find key words that will hopefully alter that original result into something else. I also use the words PDF or DOC alot.

There alot of different methods, not one works for everything but results will show up.

Another thing I like to play with, lets say I find a PDF on a particular server...I look at the web address of that server file then I begin to delete words from that web address. First that goes is the actual file name along with the extension. If nothing happens I delete again from the web address untill the next backslash and try again.

You will be surprised to find out how many times you can drill down to and enter a file server this way.

Then my favorite, the "Wayback Machine" Internet archive. You would be shocked to learn that many times you can still download a file from a site that is no longer active just because the Internet archive has it saved somewhere on there servers !!!

In the end, it all luck and perseverance!

Send me info on your boiler, I would like to see what I can ..or cannot find!

Example: I just googled this " steam boilers maintenance manual pdf "

Cut n paste that into google and take a look at how many PDF came back.
Next search I change some search words, or try to look into their servers by deleting words on the web address of the file I am looking at!

Another play on words, " obsolete steam boilers repair manual pdf:' and I found this...!

https://www.weil-mclain.com/products...inued-products
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Old 09-11-2022, 05:52 PM   #9
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Engine: 8.2
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yes sir i can close my eyes and do weil mclaine without google?
its they crazy stuff i get into that google fu or whatever else"?
got it my experience keeps this boiler from blowing.
yes sir and thank you i already have those in hard copy?
my wifes library is different then mine.
mine is vehichle stuff heavy equipment stuff and boilers and chillers and then steam powered stuff because the bases are trying to get away from steam but they are trying.
i know the system and there people dont?
i still do install that is getting tore out before i ever finish it?
our govt at it best?
couldnt fund the project it had already allocated money for because of covid?
now its because of ukraine?
wait its because of the f-35 which we have already given to other countries?
i live and work in a military community.
who is gonna BS WHO?
airforce recall the osprey
but 300 still fly here.
i am not mission assistant?
marines aint scared and they use more the the AIRFORCE.
which one has a pucker?
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Old 09-11-2022, 06:15 PM   #10
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i am sorry this has nothing to do with your issue.
EWO is dang good.
and i vented in wrong place.
my fault and once again am sorry that i was out of place.
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Old 09-11-2022, 08:04 PM   #11
Bus Crazy
 
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Year: 1999
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Engine: DT466E HT 250HP - Md3060
Quote:
Originally Posted by Jolly Roger bus 223 View Post
i am sorry this has nothing to do with your issue.
EWO is dang good.
and i vented in wrong place.
my fault and once again am sorry that i was out of place.
LMAO...it's all good...heck after 2,000 posts I think your allowed to vent at least once !

I remember as a young kid growing up in the Bronx, steam radiators everywhere! And boy those things can burn you!!!

Steam boilers is an art of the past, you would do very well if you did some instructional videos...not for free of course!

Anyway, back to to the thread!
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Old 09-29-2022, 05:31 PM   #12
Mini-Skoolie
 
Join Date: Sep 2020
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Chassis: Saf-T-Liner HDX
Engine: CAT7
Rated Cap: 56
Quote:
Originally Posted by ewo1 View Post
Loose and/or rusted connections can cause voltage fluctuations.
I would also check the light sockets for rust/corrosions and also the grounding points for each light too!
Right, but if the lights work with the hazard switch on, wouldn't that be an indication that it is not an issue with the lights, but an issue with the left turn signal circuit?
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Old 09-29-2022, 05:34 PM   #13
Mini-Skoolie
 
Join Date: Sep 2020
Location: Paragon, IN
Posts: 25
Year: 2005
Coachwork: Thomas
Chassis: Saf-T-Liner HDX
Engine: CAT7
Rated Cap: 56
Quote:
Originally Posted by Jolly Roger bus 223 View Post
i am sorry this has nothing to do with your issue.
EWO is dang good.
and i vented in wrong place.
my fault and once again am sorry that i was out of place.
You are all good! Forums are meant to be organized by topics, but I think it's okay to deviate occasionally! Especially a senior member like youself.
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Old 09-29-2022, 11:44 PM   #14
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Join Date: Sep 2019
Location: Northern Virginia
Posts: 563
Year: 2001
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Chassis: MVP ER
Engine: CAT 3126
Quote:
Originally Posted by sealguy77 View Post
I don't think it is an issue with the lights grounding because the hazard lights work for both the left and right sides. That is why I was thinking it was the switch and replaced it.

Perhaps it is a relay or something? I can't find schematics or electrical drawings for the turn signal/hazards, so I don't know what to replace/fix next.
If you want, DM me your email address. I recently received a PDF service manual from my local Thomas dealer that seems to date to around 2003 or 2004. It's definitely for the HDX tho.

A pity it's not relevant to my bus, but hopefully you or someone else here can make use of it.
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Old 09-30-2022, 12:56 AM   #15
Mini-Skoolie
 
Join Date: Sep 2020
Location: Paragon, IN
Posts: 25
Year: 2005
Coachwork: Thomas
Chassis: Saf-T-Liner HDX
Engine: CAT7
Rated Cap: 56
Quote:
Originally Posted by Truthseeker4449 View Post
If you want, DM me your email address. I recently received a PDF service manual from my local Thomas dealer that seems to date to around 2003 or 2004. It's definitely for the HDX tho.

A pity it's not relevant to my bus, but hopefully you or someone else here can make use of it.
You're awesome! Thanks. Will send. Sorry it didn't work out for your bus.

Also, curious, is your handle based on Terry Goodkind's "The Sword of Truth"?
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