use turn signals and hazard flashers come on?

Discussion in 'GMC Truck Forum' started by Hotboy, Jan 27, 2009.

  1. Hotboy

    Hotboy Full Member

    Joined:
    Jan 9, 2009
    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    0
    Occupation:
    contractor/cook
    Location:
    Murfreesboro,Tn
    Heres another weird issue that i have fellas, when i hit the right turn signal my hazard flashers come on on all four outer lights. when i use the left signal it works ok outside the truck but the indicator on the dash shows that the hazards are on. on the inside of the truck left or right turn signal, the hazard flashes thanks brothers much appreciated!!!!!
     
  2. crabtruck

    crabtruck Senior Member

    Joined:
    Jul 9, 2007
    Messages:
    5,566
    Likes Received:
    141
    Trophy Points:
    0
    Hotboy I'm a little confused by the description,maybe you can clarify.

    How close is this?
    1) No brake pedal,no haz,no turn = all lamps in and outside normal off.
    2) No brake pedal,no haz,left sig = Ft/Rr outside ok, L+R dash blink
    3) No brake pedal,no haz,right sig = 4way outside blink, L+R dash blink
    4) No brake pedal, haz on, no sig = didn't say
    5) brake pedal pushed, no haz, no sig = didn't say
    6) Brake pushed, haz on, right sig, left hand sig (with glove) = didn't say
    OK, don't really expect that last one :D

    Partly why I ask, is that I believe the dash blinkers and the front lamps
    are spliced together at the plug for the turn switch. That would mean
    they would show the same problems even though the rear differs.

    It sounds to me like metal inside the turn switch has broken loose and is shorting contacts inside it.
    You could do more in the way of trouble shooting, but I think you need a new turn switch.
    Seems like you should have noticed a problem with the stop lamps, but idk.

    These may help if you go digging...
    [​IMG]
    [​IMG]
     
  3. Hotboy

    Hotboy Full Member

    Joined:
    Jan 9, 2009
    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    0
    Occupation:
    contractor/cook
    Location:
    Murfreesboro,Tn
    Sorry to reply so late i work like 14hrs a day, the brakes dont affect it nor the headlights being on, its only when I hit the left or right turn signal, no hazards or brakes. and im sorry but it does it on both left and right signals this thing is pretty confusing someone asked on here for a wiring diagram for a 85 GMC 1500would that diagram also apply to my 86 GMC 2500 crewcab??
     
  4. crabtruck

    crabtruck Senior Member

    Joined:
    Jul 9, 2007
    Messages:
    5,566
    Likes Received:
    141
    Trophy Points:
    0
    A certain amount of delay is normal in any conversation on a forum.
    I think all those 73 to 87's had much the same set up.

    Key thing is whether the haz button is part of the turn switch combo.
    If your truck is set up like the drawing, the fronts should blink EXACTLY like the dash.
    That's because they are tied together inside the switch.
    The rears may behave differently. If this IS your setup, then it seems to me
    that the contact at the Haz switch has slipped and is shorting L & R fronts
    together, and sometimes the rears get connected.

    Two choices:
    if you're lucky and good at puzzles you could disassemble and try to fix Haz part of switch.
    Or just buy a new combo turn / haz switch.

    LMC Truck Parts says Part # 36-0616 TURN SIGNAL SWITCH $39.95 Each
    Site you may want to use for ref: LMC Truck Parts - Page 1
    Page with parts: LMC Truck Parts - Page 161
    They'll send you a free catalog or you can read on line for free.
    Others sites or local may be better to buy from.
     
  5. silverhairdeere

    silverhairdeere Senior Member

    Joined:
    Feb 15, 2008
    Messages:
    1,831
    Likes Received:
    33
    Trophy Points:
    0
    Occupation:
    disabled
    Location:
    land between the lakes tn
    hope this helps

    shd
     

    Attached Files:

  6. Hotboy

    Hotboy Full Member

    Joined:
    Jan 9, 2009
    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    0
    Occupation:
    contractor/cook
    Location:
    Murfreesboro,Tn
    Alright what do you recommend that I get??? I tried the hazard lights switch and they DIDNT work only when i used the left or right turn signal. its VERY crazy!!! Not touching the brakes pushed the hazards switch on and NOTHING!! Hit the left or right turn signal and hazards light up.. whatever i do no turn signal, do i replace them both or what i am LOST in the woods!?!?!?!
     
  7. crabtruck

    crabtruck Senior Member

    Joined:
    Jul 9, 2007
    Messages:
    5,566
    Likes Received:
    141
    Trophy Points:
    0
    #7 crabtruck, Jan 30, 2009
    Last edited: Jan 30, 2009
    Now I'm more convinced that your problem is the contact from the flasher switch
    has come free and is shorting the contacts for the turn signals.
    See the top of the drawing in post#2 ?
    That Haz bar is shorting to the left and right (lt blu and dk blu),
    just luck it is not hitting rear brakes (black) also.
    BTW the real brake wire is white not black.

    Like I said earlier, try to take apart - if you get lucky you can fix.
    Most likely you need to replace the switch.

    If you can live without Haz and money is too tight,
    take apart and remove that shorting bar.
    It's only for Haz and your problem should go away.
    Until you need the Haz of course.
     
  8. crabtruck

    crabtruck Senior Member

    Joined:
    Jul 9, 2007
    Messages:
    5,566
    Likes Received:
    141
    Trophy Points:
    0
    Actually you may be able to sneak the haz part out without replacing the turn.
    Get a parts blow up from a local store or dealer to check. Still the problem.
     
  9. Hotboy

    Hotboy Full Member

    Joined:
    Jan 9, 2009
    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    0
    Occupation:
    contractor/cook
    Location:
    Murfreesboro,Tn
    WOW you are awesome i kinda understand what you are saying and some of it sounds like spanglish! I get the jist dont need no hazards at all just them turn signals CRABTRUCK thank you and silverhaireddeere man yall are MASTERS at this!! so i need to get a FLASHER SWITCH, and i was thinkin while i was in there a TURN SIGNAL SWICTH and that would fix all my problems for good huh??!!??
     
  10. scavanger

    scavanger Full Member

    Joined:
    May 15, 2007
    Messages:
    1,780
    Likes Received:
    1,340
    Trophy Points:
    113
    Occupation:
    machinest working on retireing come June 2015
    have you checked your signal light bulbs ?
    I have seen bulb filements short between the signal and tail light and do very strange things.

    Scav.
    :)
     

Share This Page