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Recently my sub has stopped woking due to not having enough power i have checked all the fuses and tested the amount of volts running through and found that when the head unit was on the power was decreasing from the sub i think it is something to do with the remote cable but not sure hope you can help thanks

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The remote cable only brings a low current 12v trigger supply to turn on the amplifier,because it is remotely mounted with out any on / off switch or its own . Use heavy cables for the Power + and power - of the sub woofer. And make sure the + red wire of the Sub module is directly connected to the battery terminals of the car and the - black wire is bolted well to the body of the car ( make sure the nut is not painted or insulated ).

Posted on Mar 14, 2011

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Posted on Jan 02, 2017

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I own a 1999 pontiac grand am gt. I was hooking an amp up to a set of subs and got everything to work. When I finished and put my dash back together it all stopped working. My head unite (alpine cdm-7871)...


Get a multimeter cheap on ebay ,and test the red (positive wire from the radio with the key tuned to on position. should read 12v.. Key off should have 0 volts. Then check the yellow wire, should read 12 volts continuous with the car on or off. If you don't get a reading from yellow wire, you can run it from the battery into the car. Red, you would have to run from the fuse box and should only have electricity with acc on (key in ignition) If both red and yellow wires read 12v. you could have grounding issues. Use the black wire from the head unit and wire it to metal. These are the only 3 wires you have to worry about.

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I have just recently replaced the battery on my MR2 and the car was driving fine and after a week I noticed that the voltage meter was reading almost half way rather than the normal three quarters. I kept...


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1) Computer isn't working, due to the Processor isn't working, due to a bad Power Supply.
Weak voltage power rail.

Enough power perhaps to light LED lights, and maybe spin fans, but not enough power to turn the Processor on.

Computer Power Supply's are rated in Wattage.
Volts times Amperes = Watts.
(Average computer power supply in a fairly new computer, is rated at around 300 Watts)

A) ALL of the LED lights combined, use less than 1 Watt of power.
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FIRST THING TO CHECK. BATTERY VOLTAGE IT SHOULD BE 12.5 VOLTS.IF NOT HAVE IT CHARGED AND TESTED.IF CHARGED AND GOOD. CHECK ALTERNATOR ALTERNATOR OUT PUT.IT SHOULD BE 13.5 TO 14.5 VOLTS WITH CAR RUNNING IF NOT.HAVE ALTERNATOR REMOVE AND TESTED MAKE SURE.BECAUSE IT COULD BE A BLOWED FUSE OR FUSE LINK.BELT SLIPPING AND ALTERNATOR WIRES BROKEN OR MAKING BAD CONNECTION.DUE TO RADIO LOCK OUT FEATURES .DONT FORGET TO TURN OFF RADIO BEFORE REMOVING THE NEGATIVE BATTERY CABLE.

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My best bet is its your Sliding roof drive gear sub-assembly. I would also check your sliding roof control switch and you wiring harness. In fact i would check those those first since they are the fastest to check and then that only leaves your sub assembly. you will need to remove your headliner to test everything. And you will need a volt meter that you can get for a couple bucks at most electrical stores. use your volt meter to make sure your getting the same amount of to power to your switch as your getting just past it when it is closed. then test the wiring closest to your motor with the switch closed and there a very minimal amount of volts lost. If everything checks out i would go with the sub assembly. Hope this helps.

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