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Thoughts on electrical issue

Discussion in 'Terminator Talk' started by efnfast, Feb 25, 2018.

  1. efnfast

    efnfast Active Member Established Member

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    04 cobra, ~200k miles.

    Sometimes when I key off the car the gauges will start to sweep to zero but freeze and the odometer will flash dashes (which I think means it lost connection with PCM).

    At the same time when this started happening, every month or two (i.e., very infrequently) when I try to start the car I"ll hear a loud CLICK and then I'll lose all power to the car (everywhere, for example, no power windows or trunk, etc...). If I pull the key out of the ignition I hear a loud TICK TICK TICK coming from underneath the driver dash. If I stick the key back in the TICKing will stop, and resume if I remove the key. The only way I can get power back to the car is to disconnect the battery, wait a minute, then hook it back up. Then everything works perfectly, at least until it happens again.

    I kinda think CCRM because of the odometer flashing dashes at me, but I don't think the CCRM would explain losing all power in the car when I try to start it. I kinda think something with the starter, like maybe it's shorting itself and that causes a circuit breaker to blow, but then it should be a consistent problem, not one that happens every month or two.
     
  2. MG0h3

    MG0h3 Well-Known Member Established Member

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    I would check main bat. power and grounds. A weak connection can "fail" when stressed (cranking).

    No comment on the clicking...
     
  3. 02JoeGhost

    02JoeGhost Boost it hard Established Member

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    Also check connections at the fuse panel under the dash.
     
  4. hotcobra03

    hotcobra03 Well-Known Member Established Member

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    grounds on radiator support.

    I've had issues with the rings cracking and had issue with ground wire burning up inside casing..

    I did replace ground wire from battery to support with a larger size battery wire..

    the oem battery terminal' also wear after time..
    if they have been replaced..like mine have..
    these get dirty fast..and need a ot more cleaning than most..

    I've had bad alts,bad batterys,these issues have only set battery light
     
  5. efnfast

    efnfast Active Member Established Member

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    I've replaced the battery so it can't be that. I did a voltage drop test on the connections and they seemed okay. Visually connections seem okay but I guess I shuld give them a cleaning, couldn't hurt.
     
  6. MG0h3

    MG0h3 Well-Known Member Established Member

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    visual doesn't work. I'd have a multi meter on hand and test during failure.
     
  7. 03SonicVert

    03SonicVert Ford Junkie since 1996 Established Member

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    Do a visual on the ignition switch! The 2 halves start to separate and the internal contacts start to separate as well causing all sorts of weird issues. At that mileage grab a Motorcraft Ignition switch and replace the original.

    SV
     
  8. jbou91

    jbou91 Active Member Established Member

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    Chicago, IL
    Had an issue like this. Ended up being a loose ground in the trunk connecting to the FPDM.
     

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