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Message: <blockquote data-quote="amartin_72" data-source="post: 1596763" data-attributes="member: 564679"><p>Make sure you have a good ground. Get a digital multimeter and set it to DC Voltage.  Go to your alt. and find the red post where the positive charge comes out. Then measure the voltage between the negative battery terminal and that post on the altenator. It should be over 13 volts at idle. Then measure the voltage right at the two batter terminals. If this is dropping more than .2 volts with nothing running then you need to upgrade the wire going from the alt to the battery. You could have all your compressors on and if it goes down even more you def. need to upgrade the alt connection. That will not be the main cause of the amp failure though. Second, you said that you ran sheet metal screws four your ground, now i did the same thing on my first install years ago but that is NOT reccomended and you need to grind or sand the frame or thick part of the body until its shiny bare metal on both sides and then use a bolt with washers and a good ring terminal. Put the 150 amp fuse in and make sure it has good connecions. After you have done that, With the truck running Check the voltage on the ends of the wires that would connect to the amplifier at this point and compare it to what you read on the battery terminals. Again if there is a significant drop in voltage from the battery to the amp connection, there is something wrong. No more than .4 volts is acceptable for 4 gauge running the lenght of a truck. After your sure you have a good source of power for the amp, switch your digital multimeter to OHMs and just check to make sure your subs are reading 2 ohms on each sub setup when you ahve them wired in parallell or they measure 1ohm and no less when you have them all wire together. If all of this is good and you cannot find any other reason for your amplifier damadge, burn a CD with test tones of -3db attenuation 40-60hz on it and put it in your cd player. You can download these in any music downloading program or buy a cd with test tones. Play the cd with the vaious test tones and check the voltage on the ends of the RCA's in AC Voltage, where they go into the amp. If your deck , sony, is rated at 2 volts then you should not have any more than 2 volts coming out of the RCA's with those test tones. Turn the volume up on the deck until you get an AC reading of about 1.7 volts with each test tone from 40-60 hz in 5 or 10 hz incriments. Make sure your equalization is all set to flat before you do this. After that has been done, connect the amp without connecting the subs yet. Then adjust the gain on the amp so that when you play test tones from your cd you made, the AC voltage on the amplifier should be 32V for 1024 watts RMS or 39 volts for about 1500 watts RMS. These are very precise and any change in the voltage increases the current draw and wattage for the amp. I would reccomend setting it at 38 volts and trying it out that way for a week and see if you have the same problems. If you blow another amp I have no idea what you could be doing wrong.</p></blockquote><p></p>

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