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    rpeAMP's Avatar
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    Amp won't turn on....

    Hey all,

    I have an Alpine MRP-M200 amp pushing 200W x 1 into my 2Ohm Boston Acoustics ProSeries 12.5LF subwoofer. Just this morning, after turning on the car, I noticed there was no bass. After making sure that the HU was set to NF ON, I went to the back and noticed that the light wasn't on (indicating the amp wasn't on). I tested the + and ground connections with a voltimeter, got a steady 12V with the car not on, and 13V with the car on. However, I got no voltage when testing the turn-on lead and the ground. Does this indicate that the turn-on lead is spliced or for whatever reason not sending the current?

    What other ways could I narrow down the problem?

    BTW- All fuses are good.

    Thanks in advance.



    1992 Toyota 4Runner SR5 4WD (5 Spd.)
    Pioneer DEH-P6500 Head Unit
    Boston Acoustics ProSeries 4.5 Components (Front)
    Boston Acoustics RX47s (Rear)
    JBL P-80.4 Amp (for front's and rear's)
    Boston Acoustics ProSeries 12.5LF 12" subwoofer
    Alpine MRP-M200 Power Amp (for subwoofer)




  2. #2
    F150Matt's Avatar
    F150Matt is offline Senior VIP Member



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    might want to check your ground, make sure it is still grounded off good. If your ground isn't grounded I would think it could keep the amp from turning on, but I'm no expert, I'm still learning too!



    Matt Sibley
    Dad, Electrical Engineer, MBA

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  3. #3
    fantomas's Avatar
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    try to trace your remote turn on wire back to your head unit for any bare wire that would be grounded before going to the amp. if all seems fine, then there might be something wrong with your head unit remote turn on ... in this case, do like i did and tap into something else that turns on when the ignition is on (avoiding the HU altogether) and then connect a switch so you can turn the amp on and off independantly from the HU. well this is what i did. i hope this helps....jsut ask if oyu need anything clarified. -scott




  4. #4
    CrazeFuol's Avatar
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    Just re-ground the wire... that was my problem before... now my bass works fine... the ground could of been lost.. something could of melted, never know...

    I mean that is just one area that I can propose to fix..




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