Pioneer Car Amplifier GM-5100T - 2CH 760 Watts Car Audio Amplifier Logo
Posted on Jun 27, 2008
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Pioneer 760W (Mosfet Power Supply) Amplier

Car battery (power source) is connected to the amp, stereo connected, and speakers. Amp works great when car is ON but when stereo turned off and the car turned off, there is 4V DC on the ground side of the amp causing it to drain the battery. What is causing the problem?

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  • Posted on Jun 27, 2008
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Joined: Jun 16, 2008
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If you are connecting the negative lead of the voltmeter to the chassis of the car, and then checking the voltage at the amp on the ground power input of the amplifier, then your amplifier is not grounded properly. The amp should also be grounded on the chassis of the car, so if you have 4 V DC on it, it can not possibly be grounded to the chassis. The chassis is the same potential at any point on the car.

Could it be that the 4 V DC is at the power terminals +B or positive voltage? That would not be an uncommon thing to have since the amplifier will hold some charge after it is turned off and that would be normal.

Since you have a voltage meter, you could check the current draw of the amplifier if your meter also have a setting for current or amps.

If so, connect the meter in series with the ground of the amplifier. That means to disconnect the ground wire at the amplifier, and use the meter to complete the ground connection by putting one lead of the meter on the ground wire that should be connected to the chassis of the car and the other lead to the ground terminal of the amplifier. It does not matter which lead you connect to the wire or the amplifier, that would only make your measurement i postive current or negative current, but the meter must be set up properly for current. Most of them have a diiferent jack to put the positive lead into for current. most have two different jacks. If yours does also, choose the lead with the larger amp rating. Most have 10A and 300mA, the lareger amp rating is 10A. That is 10 amps max and the 300mA means 300 milli-amps which is .3 amps max.
Do this with the amplifier turned off and the car off. If you measure any current at that point you do have a current draw with the amp off and the amp would need to be serviced by a professional. If you have no current draw there, the amp is not the source of your battery draining. This would find out for certain if the amplifier is really draining the battery.

If you have found this information help a rating of "FixYa" would be appreciated.
If you need more help just ask,

Dave

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Here are the specs for the AMP:
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