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Fuse box question 85 qv

Discussion in 'Technical Q&A' started by barcheta, May 21, 2004.

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  1. barcheta

    barcheta F1 Rookie

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    #1 barcheta, May 21, 2004
    I just installed the black fusebox in my car. It looks identical to the one I pulled out. I know I correctly plugged everything back in. Now, on one of the terminals, next to radiator fan fuse terminal seems to run as a constant power source. I can start the car but I can't turn it off. Circuit is open? Any thought before I separate the three leads that are joined on the back? Should I do this or is it something else?

    thanks,
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #2 Steve Magnusson, May 21, 2004
    Jim -- "It looks identical to the one I pulled out" has got to include that the riveted interconnection straps on the backside are the same as the original:

    If you need to modify your new fusebox straps to match the old one, you've got the wrong new fusebox.

    If they match, your problem has to be elsewhere (so it wouldn't make sense to modify it).

    Are the straps on the back the same or not?
     
  3. Steve King

    Steve King F1 Rookie

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    #3 Steve King, May 21, 2004
    You may have installed it backwards . It looks the same from the front . Or you have the wrong fuse block. You got the right one instead of the left one.
     
  4. BigTex

    BigTex Seven Time F1 World Champ
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    #4 BigTex, May 21, 2004
    I have replaced both the white and black one.

    I recall I needed one line side jumper even though I had the box listed for my car, to get everything working! HTH
     
  5. barcheta

    barcheta F1 Rookie

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    #5 barcheta, May 21, 2004
    it is exactly the same. The terminal that controls the instrument lights, radio etc will come on (without turning the key to accessory) with the new box but does not with the old one. I guess it may be possible that I might have switched a wire at the top. I don't have wire scematic to tell me what colors indicate what circuits though. does anyone know what terminal connects to what wire?.... just so I'm clear.... I'd appreciate it
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #6 Steve Magnusson, May 21, 2004
    Jim -- I believe the 308QV schematic (with wire color labels) is shown in the back of your OM -- if you can't download it from the Owners site, shoot me a PM with your email address plus year/model/version confirmation (1985, 308QV, US version?) and I'll send it.

    However, if the boxes are the same, I like Steve King's suggestion to also ensure that you don't have top/bottom reversed (but you'll probably need the schematic to figure that out as well since you've now "lost" being able to check the originial orientation -- the schematic also shows how the strap are oriented).
     
  7. barcheta

    barcheta F1 Rookie

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    #7 barcheta, May 21, 2004
    The two terminal connections are along the bottom, single on the top. A color schematic would be nice since I don't have the original o.m. thanks
     
  8. barcheta

    barcheta F1 Rookie

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    #8 barcheta, May 21, 2004
    ok... i'm at a complete loss.... Both black fuse boxes are exactly the same... with one difference. the second terminal in on the right (which is the left radiator fan fuse) has melted slightly on the original. I was replacing it not so much because it was bad but more for piece of mind. Everything has been working as it should before that with out any heat resistance issues. I hooked everthing back up as before and the car starts and stops fine. As soon as I plug the new fusebox in the exact same terminal that holds the fuse and wires for the instruments, radio and clock, it powers on as if it had current running through it. What gives? It doesn't matter if anything else is plugged in or not. As soon as I put that wire on that particular terminal it acts lkike it has power to it. Same goes for the wire next to it that controls the light circuit. My lights come on and wont go off. Has anyone else had this happen with a new fusebox? I have it mounted the exact same way as the original and everything
     
  9. Steve King

    Steve King F1 Rookie

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    #9 Steve King, May 21, 2004
    When you looked at the back of the new block was it the same as the old block. Check the 2 terminals adjacent to each other and see if you have continuity. You may also have a wire in the wrong location. Maybe someone here with a QV can post a picture of the fuse block to see what color wires are on each terminal.
     
  10. barcheta

    barcheta F1 Rookie

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    #10 barcheta, May 21, 2004
    A picture would be mighty helpful... The thing is on the old fusebox, I have no issues whatsoever. The new one appears to be exactly the same. All my wire connections are in exactly the same place as on the old one. Maybe I do have a wire out of place. BUT why do I not have a problem on the old one? This new one is the issue. I've set everything up exactly the same way I did on the old one. Something is acting as a constant power source when I plug in the wire to this particular terminal. It does not do this on any other terminal...
     
  11. ferrarifixer

    ferrarifixer F1 Veteran
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    #11 ferrarifixer, May 21, 2004
    You need to triple check by looking at the BACK of the fuse box, that you have all the same BRIDGING pieces. ie, some of the terminal positions are joined to the next by brass strips. The front of the box and the terminal layout may appear the same, but the BRIDGES on the back make it work differently.
     
  12. theunissenguido

    theunissenguido F1 Rookie
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    #12 theunissenguido, May 22, 2004
    To find out if the new box is the problem, put the old box back, just for control and see if the problem stay or disappear.
    Guido
     
  13. barcheta

    barcheta F1 Rookie

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    #13 barcheta, May 22, 2004
    I done one better. I've look at this thing 6 different times... it is exactly the same. All the bridges are exactly the same. Same size, location, grouping... This is the black box not the white one. The old one works fine... guess I'll just have to solder the rivets to guarantee no issues.
     
  14. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #14 Steve Magnusson, May 22, 2004
    Jim -- I'm not sure that you need to add/fix connections yet (IME an "open" at one of the rivets would disable a function, not add an unwanted new one -- but I'm not going to study the 308QV schematic to really confirm/deny that;)). It's bizarre that they appear to be the same visually but are not the same functionally. My advice would be to first measure (and record in a table) the DC resistance from each terminal to every other terminal for the two fuse boxes (with no wires attached and no fuses installed) -- that will tell you if any of the connections need repair or if you've somehow got some unseen unwanted connection (although it's not hurtful to solder the connections arbitrarily -- if you don't damage the plastic).

    I think we can officially promote this issue from "problem" to "gremlin" :(
     
  15. barcheta

    barcheta F1 Rookie

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    #15 barcheta, May 22, 2004

    Agreed!
     

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