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Thread: Mismatch between electrical diagram, fuse identifiers and my car

  1. #1
    Senior Member nkemp's Avatar
    Join Date:  Jun 2011

    Location:  Buffalo MN

    Posts:    619

    My VIN:    897 5 spd,

    Mismatch between electrical diagram, fuse identifiers and my car

    I thought I had a brake light problem ... but the problem was that my car does not match the wiring diagram(s) which does not match the fuse diagram/legend. And I'm sure the PO did not rewire the car.

    The diagrams show the brakes powered via an always on power source via fuse #18 (my #18 is empty ... and I have VIN 897 so supposedly there is an inline fuse which probably isn't there (or I cannot find it or it is too late for the inline fuse )). Instead my brake lights are powered through a ignition switch activated relay and fuse #4. Most fuse panel diagrams show that #4 includes the "directional indicator and stop Switch" and #18 as the "stop lamps". Since there is no indicator that the brake lights (stop lamps?) go through a relay, this just seems wrong.

    Supposedly the turn signals are fused by #6 per the wiring diagram and not #4 as indicated in the fuse legend. I've not checked that one yet.

    That begs the question of what circuits are protected by what fuses and what other discrepancies there are.

    So if you are doing some electrical chasing channel a bit of Pirates of the Caribbean " ... the code is more what you'd call "guidelines" than actual rules" Or in the DeLorean world "The wiring diagram is more what you'd call "guidelines" than actual wiring representation".

    An aside ... it is amusing how the loads are distributed amongst the fuses. Really ... a fuse that appears to only protect the reverse lights.

    That's my frustration vent for today.
    Nick
    - No matter how many people believe in a dumb idea ... it is still a dumb idea!
    - Some cars look fast. Some cars look faster than time!
    - The question is not "where did the time go" but rather "where to go in time".

  2. #2
    Administrator Ron's Avatar
    Join Date:  Jun 2011

    Location:  North GA

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    Club(s):   (SEDOC) (DCUK)

    I'm guessing yours is like several I've seen:
    Image1.jpg




















    (Directional "indicator" may/not mean "lamp"/"lights" on different schematics/charts, which sux ....)

    The brake/stop lamp fuse was inline, located near the brake pedal (Green wire...maybe a stripe?) and was hot all times on this D. (Many are.)

  3. #3
    Senior Member nkemp's Avatar
    Join Date:  Jun 2011

    Location:  Buffalo MN

    Posts:    619

    My VIN:    897 5 spd,

    Quote Originally Posted by Ron View Post
    ...The brake/stop lamp fuse was inline, located near the brake pedal (Green wire...maybe a stripe?)
    On mine, the wires from/to the brake switch go to the harness within about 6 inches (and I doubt there is a inline fuse buried farther in the harness). And when I pull the #4 fuse, I lose brake lights.
    Nick
    - No matter how many people believe in a dumb idea ... it is still a dumb idea!
    - Some cars look fast. Some cars look faster than time!
    - The question is not "where did the time go" but rather "where to go in time".

  4. #4
    EFI'd dn010's Avatar
    Join Date:  Jul 2011

    Location:  Florida: Pinellas County

    Posts:    1,571

    My VIN:    5003

    Club(s):   (DCF)

    I've found the wiring to be different between very early vins compared to others. I am sure your front wiring harness that goes to the fuel pump and radiator etc. is also different from the diagram. I had some wiring from vin 712 and it did not match my car 5003.
    -----Dan B.

  5. #5
    Senior Member Patrick C's Avatar
    Join Date:  May 2011

    Location:  Northern Michigan

    Posts:    1,002

    My VIN:    1880

    Club(s):   (DCO) (DCUK)

    There is an extra set of wires by the brake light switch in 1880. Those wires are only powered when the key is turned. The other set of wires are always live and are what I have hooked up to the brake light switch. There is also a nylon fuse holder with a glass fuse that powers those always-live brake light switch wires down under the dash in 1880. This is all factory. I would guess your VIN is the same way.
    Patrick C.
    VIN 1880
    Modifications done to my car can be seen in this video: https://youtu.be/ncMjW2pI2e4

  6. #6
    Administrator Ron's Avatar
    Join Date:  Jun 2011

    Location:  North GA

    Posts:    4,585

    Club(s):   (SEDOC) (DCUK)

    Quote Originally Posted by nkemp View Post
    On mine, the wires from/to the brake switch go to the harness within about 6 inches (and I doubt there is a inline fuse buried farther in the harness). And when I pull the #4 fuse, I lose brake lights.
    Yeah, JimJam's is like that.

    Quote Originally Posted by Patrick C View Post
    There is an extra set of wires by the brake light switch in 1880. Those wires are only powered when the key is turned. The other set of wires are always live and are what I have hooked up to the brake light switch. There is also a nylon fuse holder with a glass fuse that powers those always-live brake light switch wires down under the dash in 1880. This is all factory. I would guess your VIN is the same way.
    1669 was like 1880 ie had both.

    A while back Dennis and I came up with 3 or 4 different harnesses, iirc.
    There was one that had an extra TTS plug (WR & UB wires) near the firewall.

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