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Fuse problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Tall_Girl, Dec 25, 2001.

  1. Tall_Girl

    Tall_Girl Registered Member

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    I'm in trouble!

    A fuse called T/L CTSI (???)blows out every time. Me rear lights are dead, though the turn and brake lichts work. Also my dashboard lichts are dead. Are those on the same fuse?

    XXX
    Lana

    6'5" tall Dutch girl, just bought a 88 K5, and about to dump the jeep.
     
  2. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    That fuse leads to your light switch. You've got a dead short somewhere. Might just be the switch itself. Does it blow even when the lights are off? If it's not the switch, time to trace some wires. You can find a set of schematics <a target="_blank" href=http://www.customtruckshowcase.com/forum/showthread.php?s=&amp;threadid=663>here</a> if you need them (courtesy of 77Chev).

    Good luck.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  3. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    BTW, I think that stands for "tail lights and courtesy lights"

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  4. Tall_Girl

    Tall_Girl Registered Member

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    it blows when I switch the lichts on. But is the failure of the dash lichts the same problem?

    XXX
    Lana

    6'5" tall Dutch girl, just bought a 88 K5, and about to dump the jeep.
     
  5. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Yep.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  6. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Hmm, I thought that was on the same circuit but it looks like (schematic) that the cluster has it's own 6 amp fuse. Souding more like a bad switch I think. That's where I would start.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  7. POWERMAD

    POWERMAD 1/2 ton status

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    I had the same problem in mine awile ago and the tail lights and dash lights would go out when the fuse would blow.
    I found a wire that had been poorly spliced for trailer lights grounding on the frame.
    The wiring harness will have yellow, green, brown and white wires.
    The brown one is the tail light wire.
    These wires will go along the frame all the way to the firewall.
    I would start from the rear and work my way to the front and inspect the wiring for a place that has rubbed through.
    If the rig has been wired for trailer lights I would start there first.
    9 times out of 10 that is where the problem will be.


    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  8. Tall_Girl

    Tall_Girl Registered Member

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    Well, it's dark now. tomorrow I'm going to look into it. I will post back to you then.

    XXX
    Lana

    6'5" tall Dutch girl, just bought a 88 K5, and about to dump the jeep.
     
  9. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    You know, I thought I remembered them going out together on that one fuse. Then I saw the schematic showing the 6 amp "inst lps" fuse. I though "just my faulty memory or changes in the late 80s". Well, I looked at it again and actually ran it down. That "inst lps" fuse goes (dk grn) to the switch and then to the radio (brn) and "front roof lights". Sheesh. Oh well, should have looked closer before assuming I was wrong.

    Anyway, hopefully you'll see some problem right off. Look for butchered wiring (cheap crimp connectors, electrical tape globs, hanging wires, etc.) since those areas are more suspect. Obviously look for burnt or otherwise damaged wires under the dash (around the switch) or under the truck going along the drivers frame rail to the back (including trailer lights as PowerMad suggested). If it is not obvious, and it is not the switch, you can be in for a long search with a multi-meter to find the short.

    Good luck.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  10. michaelm

    michaelm 1/2 ton status

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    the tail ights and instrument lights are on the same circuit.
    it is a safety device to let you know when you have no tailights.
    amazing how many people are un aware of that.
    thanks for the credit baddog
     
  11. Tall_Girl

    Tall_Girl Registered Member

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    sounds logical! Wonder why european and japanese car makers didn't think of that!

    XXX
    Lana

    6'5" tall Dutch girl, just bought a 88 K5, and about to dump the jeep.
     
  12. chvyhs

    chvyhs 1/2 ton status

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    I had a similar problem with my '77 K5. It ended up being exposed wiring shorting out on the frame under the bed. Good luck.

    <a target="_blank" href=http://community.webshots.com/user/chvyhs>WebShot Pics</a>
     
  13. Skigirl

    Skigirl 1/2 ton status

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    If you don't see any obvious bad wire, there is a piece of electrical test equipment called a short finder. Has 2 wires with clamps and a meter, one end installed in place of the fuse, then then other end moved along the wiring, and the meter will tell you where the short is. Can save a lot of time if it's a short. You could probably find one online.
     
  14. michaelm

    michaelm 1/2 ton status

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    first read i thought this was a typo, "lichts", turns out I can read some dutch! who knew?
     
  15. Tall_Girl

    Tall_Girl Registered Member

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    Problem fixed. Sammy had a trick. We took the fuse out and put wires into the sockets. To these wires we connected a lightbulb. If the light lits, there is a short. But because it is a bulb, the wires won't melt or anything. So as soon as the light goes out, the shortcirquit is gone.

    Well, end of the story was a short in the radio. Who thought of that.

    Everyone thanks for there input.

    XXX
    Lana

    6'5" tall Dutch girl, just bought a 88 K5, and about to dump the jeep.
     
  16. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Radio is a VERY common point for trouble especialy an aftermarket radio. You have installer error there that is the sorce for many problems. Big screw up is for people to try to use the lead for the dash lights (the factroy radios dial dims with the dash lights) for power. When installing a after market radio it's best to go dirrectly to the fuse box. The top section of the fuse box has about a dozen open terminals for adding accessories.

    Women dig dents and flat paint!
    coloradok5.com/gallery/Grim
    75 Jimmy, Dollar
    Grim-Reaper
     

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