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Thread: Electrical Gremlin

  1. #1
    Join Date
    May 2009

    Electrical Gremlin

    The Thunderbird God is sending me a signal perhaps.
    89 Sc with 80,000 kms, no mods other than a ripper. On my way to work all of a sudden hard brake pedal, brake warning lights come on,firm ride light goes out as does arc,vmm dark,signal lights non functioning. Otherwise running normal but I pulled over after a minute. Will get a code reader this wknd. I have 4 mn12s so probably should have one. Any ideas? Realised I have to renew my membership so I can get at more info.
    Thanks in advance.

    In my haste I forgot to mention on restart everything went back to normal.
    Last edited by black V8; 06-08-2017 at 01:03 PM. Reason: Added info

  2. #2
    Join Date
    Dec 2007
    Pacific Rim

    Most likely ABS needs a fresh accumulator, but could also come down to relay(s), ABS hydraulic pump motor, ABS pressure switch and/or the multi-wire ignition switch on the side of the steering column (just did that to cure the same symptoms), inside the dash. Tons of existing threads, including one very recent, so be sure to search.

    Not sure a code reader is called for in this example, but yes, good to own regardless.

    Good luck.

    Last edited by KMT; 06-08-2017 at 01:02 PM.

  3. #3
    Join Date
    Apr 2002
    Greenville, IN
    It's very likely your ignition switch needs replaced.
    Matt Haub
    Shootouts: '09 SS 1st | '10 Mod1 2nd | '11 Bracket 3rd | '12 Bracket 1st | 2013 | '14 Bracket 3rd | 2015 | '16 Bracket 1st & Mod2 2nd | 2017 |
    Black '89 5spd - 281K miles, MPx, E85, Alky-Inj RWHP: ? RWTQ: ? Best 1/4mi:12.521, MPH:107.23mph
    35th Anniversary Auto 46k miles | Red '93 Auto 186k miles
    My Garage

  4. #4
    Join Date
    May 2002
    Dallas, TX
    Concur. The switch case expands (metal fatigue) over time until they start making loose contact. Thats when things shut off for no apparent reason.
    You can tighten the switch case up with zip ties, bailing wire, etc. or just replace it.

    Another hack is to rock the key back/forth slightly when this happens to see if it will clear up long enough for you to get home and work on it.

  5. #5
    Join Date
    May 2009
    Thanks for the replies guys, It's definitely the ignition switch. I'll get a new one and swap it out tomorrow.

    Cheers Tom

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