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Thread: HELP Power cutting off semi-randomly OPUS 250W

  1. #1
    Variable Bitrate rijndael's Avatar
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    HELP Power cutting off semi-randomly OPUS 250W

    Car:
    '05 Civic

    Hardware:
    Opus 250W
    Power reqs for system WELL below 250W
    the rest is in my signature

    rough wiring description: (nothing was changed from when I took the computer out to now...just unhooked the molex to the PSU)

    3x ground wires wired to trunk at same spot as my amp.
    3x constant power wires (yellow wires) connected to battery +
    1x red cable attached to ACC line
    2x remote lines not used due to PS never actually timing the amp turn-on correctly so i now use the DTR pin from the serial port with AMP CTRL.

    All connections are tight, the only thing I have not done is sodder the connections or use any metalic grounding paste (i forget what it's called)

    I had to yank out my system from my car about a year and a half ago when I went to Afghanistan. I came back, my wife let my car sit the entire time I was gone. I had to replace my battery, and I upgraded my alternator to a 140A HO from Ohio Generators. New battery is at 12.37v with car idle, and 14.2v when i press the gas pedal down (that was at a stand-still though, not on the road). the alternator is installed correctly with an extra 4AWG cable running to the + on the battery (as per Ohio Generators install instructions). Anyways...back on topic. Ever since I put my system back in my car, it shuts off randomly. the pin settings for the power switch cable from the Opus 250 are correct, yet when the system shuts off randomly (mostly noticed from shifting gears, taking a sharp turn, hitting a bump, or even driving in a straight line on a flat highway ) the Opus blinks 2 blinks first then blinks 4 blinks for the error code. Those tell me that the issues lie with the power switch cable from the J9. When the computer is on and I turn off the ignition, it does put the computer in hybernate without issues within 3-5 seconds of shutting off the car.

    I wasted $40 and took the car to a shop yesterday to check out the wiring, everything seems fine, even if the wires are jiggled. They only mentioned what a mess it is in my trunk with wires (fire hazard... )

    Anyone have a clue as to what is going on that would just shut the power off.
    Trouble deciding on car speakers? Clicky Clicky
    Speakers: DLS Ultimate Iridium 6.3 Link
    Subwoofer: removed
    Amplifier#1 (Front Stage): DLS Ultimate A4
    Amplifier#2 (Sub) removed
    Carputer: Removed for tablet install

  2. #2
    Maximum Bitrate kegobeer's Avatar
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    Put a meter on the power going to the power supply, and monitor it while driving. It sounds like the voltage is dropping below the minimum required for the Opus, so it's shutting down (to prevent the Opus from drawing more current from the battery, causing it to be too low to start the car). There's a jumper on the Opus that you can change to allow for a lower voltage level, which might fix your problem.
    1999 Mercury Grand Marquis GS with: ASRock E350M1 w/4GB RAM, 80GB Intel SSD, Opus DCX3.120, Visteon HD Radio + HDR-USB, PL-18N wifi, OBDLink Scan Tool, BTA6210 BT, BU-353, Win 7 Ultimate, CF 4.0, Alpine MRP-F240 + MRP-T220, RF Punch 1572s, Kicker 8" Comp.

  3. #3
    Variable Bitrate rijndael's Avatar
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    I will try that sometime this week. Thanks. The jumper has been completely removed though for the past year and a half so it would shut down if it reached 10.5v.


    Thanks again...i'll keep you posted if it works.
    Trouble deciding on car speakers? Clicky Clicky
    Speakers: DLS Ultimate Iridium 6.3 Link
    Subwoofer: removed
    Amplifier#1 (Front Stage): DLS Ultimate A4
    Amplifier#2 (Sub) removed
    Carputer: Removed for tablet install

  4. #4
    Low Bitrate Strgazr's Avatar
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    Check and clean the battery terminals and connections. I was recently having the same symptoms. Turned out after 4 yrs the connections at the battery had some buildup on them and weren't making good contact. A good cleaning and tightened back down and it's like brand new again.

  5. #5
    Variable Bitrate rijndael's Avatar
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    I have located the issue. Call me a dumb@55 if you want, but i never added extra ground wires from the engine to the chassi to account for the extra power that the alternator was supposed to be putting out. i didnt know...and I was never told nor thought to add them...and i didnt have any noise caused by grounding issues... with that said, I added 2x 4awg wires from the engine block to the chassi and i havent had an issue since (been 3 days now). Now I can focus on finally being able to put back in my sub amp and sub box, and finishing my project (at least the stereo/fabrication aspect)

    Thanks guys for your help...you gave me ideas to test out and I found the problem.

    WORDS OF ADVICE FOR THOSE STUMBLING TO THIS THREAD:

    If you add more power to your car (alternator or such)...make sure you also upgrade your ground wires (dont remove...just add extra). A loss of ground also means loss of power and can have very similar side-effects. (You can thank Butch @ Glen Burnie Generator and Carbeurator for that statement)
    Trouble deciding on car speakers? Clicky Clicky
    Speakers: DLS Ultimate Iridium 6.3 Link
    Subwoofer: removed
    Amplifier#1 (Front Stage): DLS Ultimate A4
    Amplifier#2 (Sub) removed
    Carputer: Removed for tablet install

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