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No Brakelights

Discussion in 'Early CJ5 and CJ6 Tech' started by Boyink, Oct 14, 2005.

Page 2 of 2
  1. Oct 14, 2005
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    Diodes are like a one way check valve for electricity. They allow current to flow one direction, but not the other. Reason for them in this application is to keep the tow vehicles power from back feeding throughout the wiring of the vehicle and causing "crazy lights" which are lights that flash or come on when you don't want them to.

    Nickmil.
     
    nickmil, Oct 14, 2005
    #21
  2. Oct 14, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
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    Dec 30, 2004
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    605
    Thanks, I learned something new.
     
    dohc281, Oct 14, 2005
    #22
  3. Oct 15, 2005
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
    Joined:
    Sep 20, 2002
    Messages:
    6,197
    So I stared at the wiring a bit....and the diodes can't be the issue.

    There are 3 wires heading to the back of the Jeep. One for taillights, one for the left turn signal/brakelight, and one for the right turn signal/brakelight.

    Remember - I have working taillights and turnsignals yet. So the diodes (and all the related wiring) must be fine, otherwise I'd lose both brakelights *and* turn signals as they share the same wire.

    Soooo......it has to either be the wiring between the brake light switch and turn signal housing, or the turn signal switch itself.

    Stan Day has a great Flash piece (the we really should get linked into our tech pages, BTW - mental note to self) that shows how the turn signal works:

    http://home.comcast.net/~sday77/binky/7-Wire.html

    What I can't figgire yet is how the station wagon's brakelight fuse going out has to do with the Jeep...technically the diodes should have isolated the Jeep's turn signal unit from being affected by any shorts in the rest of the wiring while being towed....
     
    Boyink, Oct 15, 2005
    #23
  4. Oct 15, 2005
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    Check the dimmer switch on the floor for bad or rusty connections. I just went through the same issue a few weeks ago.

    Edit: No headlights was my problem, not brakelights.....too early in the morning to be posting :rofl:
     
    Project71-5, Oct 15, 2005
    #24
  5. Oct 15, 2005
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
    Joined:
    Sep 20, 2002
    Messages:
    6,197
    Got it.

    There was a loose connection under the dash....there's a little tri-angular connection between the turn signal harness and the firewall..and the brake light wire had pulled out.

    So brake lights are working, but now I notice that I don't have a right front turn signal...and when in parking light mode it's shining brigher than the left, so must still be some things hooked up wrong.
     
    Boyink, Oct 15, 2005
    #25
  6. Oct 15, 2005
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
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    4,275
    Sounds like you have the turn & parking light wires reversed on the right front.
     
    w3srl, Oct 15, 2005
    #26
  7. Oct 15, 2005
    tgregg

    tgregg Member

    Oak Hills, CA...
    Joined:
    Apr 14, 2005
    Messages:
    529
    What are diodes for? I'm totally electronically illiterate
     
    tgregg, Oct 15, 2005
    #27
  8. Oct 15, 2005
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
    Joined:
    Sep 20, 2002
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    6,197
    Thats what I thought too...so tried reverseing them and now don't have any turn signals up front...:rofl:

    At any rate...it's too danged nice to be working on it...rather drive it.

    On the diodes..read back as their purpose was explained...
     
    Boyink, Oct 15, 2005
    #28
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