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  #1  
Old June 19th, 2015, 12:38 AM
gwmckee
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George
1994 NAS D90 #1919
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Turn Signal Help

Hi All,

I have been struggling for a week now trying to figure out why my turn signals flash rapidly. All four bulbs are working. The hazard lights work just fine. Any suggestions on how to trouble shoot this?

Thanks in advance.
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  #2  
Old June 19th, 2015, 12:41 AM
javelinadave
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You have LED bulbs in them
or
the flasher is about to die
or
a bad ground
or
A bad bulb

I think that should cover it but if I missed something somebody will be along shortly with another idea.
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  #3  
Old June 19th, 2015, 01:01 AM
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Mack Crouch
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Is the bulb for the turn signal indicator on the dash display still good?
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  #4  
Old June 19th, 2015, 07:24 AM
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Quote:
Originally Posted by JSBriggs View Post
It's a feature. Helps to get other drivers attention.

-Jeff
Don't listen to him he drives with the hazards on ...always!!
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  #5  
Old June 19th, 2015, 07:27 AM
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A quick flash indicates less resistance in the system, thus a bulb being out. (or less resistance from using LED bulbs) If all three lights are working on each side then I would zero in on the flasher, however it still could be a ground as mentioned above. Have a look at the hazard switch also making sure both wires on the back side, as well as the main connector, are making a good contact. Once you have checked those things and you still have the problem it may be in the turn signal itself.
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  #6  
Old June 19th, 2015, 08:06 AM
gwmckee
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George
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Boy, you guys are fast!

To give everyone a more complete picture...
- Bulbs are conventional
- All four bulbs are working
- The indicator light on the dash is working
- Being that this is an AA Yellow D90, I have no problems getting other driver's attention

Thanks again for all the help.

------ Follow up post added June 19th, 2015 08:08 AM ------

Dave - when you say "the flasher is about to die", do you mean the hazard unit on the dash? The relay? Something else?
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  #7  
Old June 19th, 2015, 09:58 AM
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Quote:
Originally Posted by gwmckee View Post
Boy, you guys are fast!

To give everyone a more complete picture...
- Bulbs are conventional
- All four bulbs are working
- The indicator light on the dash is working

Dave - when you say "the flasher is about to die", do you mean the hazard unit on the dash? The relay? Something else?
There are 7 bulbs in the flasher system - 4 corners, 2 repeaters, 1 indicator in dash

most likely the hazard switch is the culprit, pull off, contact cleaner and reinstall

next candidate is the flasher relay - same treatment as above (then replace)
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  #8  
Old June 19th, 2015, 10:08 AM
gwmckee
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Well, now you've stumped me on the repeaters. Are the front side markers supposed to flash with the turn signals? All four on my side markers are static.
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  #9  
Old June 19th, 2015, 10:11 AM
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Quote:
Originally Posted by gwmckee View Post
Well, now you've stumped me on the repeaters. Are the front side markers supposed to flash with the turn signals? All four on my side markers are static.
NAS repeaters in the bumper?

ROW trucks have side-markers repeaters
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  #10  
Old June 19th, 2015, 10:28 AM
gwmckee
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There you go. I don't have any repeaters in my bumpers. Any way I can wire it up to fix the quick blinking?
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  #11  
Old June 19th, 2015, 10:30 AM
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Quote:
Originally Posted by gwmckee View Post
There you go. I don't have any repeaters in my bumpers. Any way I can wire it up to fix the quick blinking?
Did you check the front side markers - verify they are reflectors only?

Is this a new phenomenon or has always been this way?
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  #12  
Old June 19th, 2015, 10:56 AM
gwmckee
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I've only had the truck for about three weeks and it has always been this way. The side markers have bulbs in them and come on when I put the lights on. I replaced the right rear side marker wiring harness because the one that was in there was corroded and didn't work. None of the side marker lights worked when I got the truck but after removing all the bulbs and spraying the connections with WD-40, they came back to life.
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  #13  
Old June 19th, 2015, 11:07 AM
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Quote:
Originally Posted by gwmckee View Post
I've only had the truck for about three weeks and it has always been this way. The side markers have bulbs in them and come on when I put the lights on. I replaced the right rear side marker wiring harness because the one that was in there was corroded and didn't work. None of the side marker lights worked when I got the truck but after removing all the bulbs and spraying the connections with WD-40, they came back to life.
Harness is then likely wired for the bumper repeaters 1995 NAS 90?

- there are a few options to fix.

1. Add repeaters (swap marker-light circuit with turn-signal circuit into sidelights up front or install into bumper if still in place)
2. Add resistors (plug into repeater circuit on both sides)
3. Swap to a flasher relay with potentiometer (IE adjustable relay like used in LED application)
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  #14  
Old June 19th, 2015, 11:12 AM
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It used to have an ARB front bumper with the blinkers in it - are they still wired?
__________________
Quote:
I am talking purely from an aesthetics standpoint.
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  #15  
Old June 19th, 2015, 11:14 AM
gwmckee
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George
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Option one seems to be ideal. I'll start on it today. Thanks again for the help.
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  #16  
Old June 20th, 2015, 02:24 PM
gwmckee
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George
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I'll check and see. Lots of cut wires on her.
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  #17  
Old July 2nd, 2015, 12:19 AM
gwmckee
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George
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Quote:
Originally Posted by rijosho View Post
It used to have an ARB front bumper with the blinkers in it - are they still wired?
Hey Josh - the front bumper doesn't have any allowance for repeaters... as far as I can tell, the wires for the repeaters have been cut (red/orange and black). I am thinking that this would essentially create infinit resistance and the system would think a bulb was out. I put a resistor on them but that didn't solve the fast blinking. Is there anything else you can suggest? FYI, I did take the connectors apart on the hazard switch and clean them.
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